Annual report pursuant to Section 13 and 15(d)

Schedule I - Condensed Financial Information of Registrant (PARENT ONLY) - STATEMENTS OF STOCKHOLDERS' EQUITY (Details)

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Schedule I - Condensed Financial Information of Registrant (PARENT ONLY) - STATEMENTS OF STOCKHOLDERS' EQUITY (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Increase (Decrease) in Stockholders' Equity                      
Balance       $ 1,287         $ 1,287    
Balance (in shares)       236,370,347         236,370,347    
Net income $ 246 $ 147 $ 167 $ 76 $ 128 $ 55 $ 87 $ 56 $ 636 $ 326 $ 93
Other comprehensive income (loss)                 296 (391) (240)
Vesting of stock awards                 8 2 7
Recognition of stock-based compensation                 28 25 26
Repurchase and cancellation of stock awards                 (12) (3) (7)
Contribution from noncontrolling interests                 5    
Stock options exercised                 35 1 1
Excess tax benefit related to stock‑based compensation                   (3) 1
Cash paid for noncontrolling interest                     (1)
Dividends paid to noncontrolling interests                 (34) (30) (14)
Disposition of a portion of P and A Business                 413    
Costs of the IPO and secondary offering of the P&A Business                 (58)    
Noncontrolling interest from partial disposal of P and A Business                 602    
Treasury stock repurchased                     (100)
Dividends declared on common stock                 (120) (120) (121)
Balance $ 2,620       $ 1,287       $ 2,620 $ 1,287  
Balance (in shares) 240,213,606       236,370,347       240,213,606 236,370,347  
Parent                      
Increase (Decrease) in Stockholders' Equity                      
Balance       $ 1,287       $ 1,442 $ 1,287 $ 1,442 1,778
Balance (in shares)       236,370,347         236,370,347    
Net income                 $ 636 326 93
Other comprehensive income (loss)                 403 (383) (235)
Vesting of stock awards                 8 2 7
Recognition of stock-based compensation                 28 25 26
Repurchase and cancellation of stock awards                 (12) (3) (7)
Stock options exercised                 35 1 1
Excess tax benefit related to stock‑based compensation                   3 1
Cash paid for noncontrolling interest                     (1)
Disposition of a portion of P and A Business                 413    
Costs of the IPO and secondary offering of the P&A Business                 (58)    
Treasury stock repurchased                     (100)
Dividends declared on common stock                 (120) (120) (121)
Balance $ 2,620       $ 1,287       $ 2,620 $ 1,287 $ 1,442
Balance (in shares) 240,213,606       236,370,347       240,213,606 236,370,347  
Common stock                      
Increase (Decrease) in Stockholders' Equity                      
Balance (in shares)       236,370,347       237,080,026 236,370,347 237,080,026 243,416,979
Vesting of stock awards (in shares)                 1,316,975 914,081 1,037,743
Repurchase and cancellation of stock awards (in shares)                 (402,978) (256,468) (304,340)
Stock options exercised (in shares)                 2,929,262 77,477 48,572
Treasury stock repurchased (in shares)                   (1,444,769) (7,118,928)
Balance (in shares) 240,213,606       236,370,347       240,213,606 236,370,347 237,080,026
Common stock | Parent                      
Increase (Decrease) in Stockholders' Equity                      
Balance       $ 3       $ 3 $ 3 $ 3 $ 3
Balance (in shares)       236,370,347       237,080,026 236,370,347 237,080,026 243,416,979
Vesting of stock awards (in shares)                 1,316,975 914,081 1,037,743
Repurchase and cancellation of stock awards (in shares)                 (402,978) (256,468) (304,340)
Stock options exercised (in shares)                 2,929,262 77,477 48,572
Treasury stock repurchased (in shares)                   (1,444,769) (7,118,928)
Balance $ 3       $ 3       $ 3 $ 3 $ 3
Balance (in shares) 240,213,606       236,370,347       240,213,606 236,370,347 237,080,026
Additional paid-in capital                      
Increase (Decrease) in Stockholders' Equity                      
Issuance of nonvested stock awards                 $ 18 $ 16 $ 19
Vesting of stock awards                 8 2 7
Recognition of stock-based compensation                 10 9 10
Stock options exercised                 53 1 1
Excess tax benefit related to stock‑based compensation                   (3) 1
Cash paid for noncontrolling interest                     (1)
Disposition of a portion of P and A Business                 413    
Costs of the IPO and secondary offering of the P&A Business                 (58)    
Conversion of restricted awards to P and A Business awards                 (2)    
Treasury stock repurchased                   15 (15)
Additional paid-in capital | Parent                      
Increase (Decrease) in Stockholders' Equity                      
Balance       $ 3,447       $ 3,407 3,447 3,407 3,385
Issuance of nonvested stock awards                 18 16 19
Vesting of stock awards                 8 2 7
Recognition of stock-based compensation                 10 9 10
Stock options exercised                 53 1 1
Excess tax benefit related to stock‑based compensation                   3 1
Cash paid for noncontrolling interest                     (1)
Disposition of a portion of P and A Business                 413    
Costs of the IPO and secondary offering of the P&A Business                 (58)    
Conversion of restricted awards to P and A Business awards                 (2)    
Treasury stock repurchased                   15 (15)
Balance $ 3,889       $ 3,447       3,889 3,447 3,407
Treasury stock                      
Increase (Decrease) in Stockholders' Equity                      
Treasury stock repurchased                   (15) (85)
Treasury stock | Parent                      
Increase (Decrease) in Stockholders' Equity                      
Balance       (150)       (135) (150) (135) (50)
Treasury stock repurchased                   (15) (85)
Balance (150)       (150)       (150) (150) (135)
Unearned stock-based compensation                      
Increase (Decrease) in Stockholders' Equity                      
Issuance of nonvested stock awards                 (18) (16) (19)
Recognition of stock-based compensation                 18 16 16
Conversion of restricted awards to P and A Business awards                 2    
Unearned stock-based compensation | Parent                      
Increase (Decrease) in Stockholders' Equity                      
Balance       (17)       (17) (17) (17) (14)
Issuance of nonvested stock awards                 (18) (16) (19)
Recognition of stock-based compensation                 18 16 16
Conversion of restricted awards to P and A Business awards                 2    
Balance (15)       (17)       (15) (17) (17)
Retained earnings (accumulated deficit)                      
Increase (Decrease) in Stockholders' Equity                      
Repurchase and cancellation of stock awards                 (12) (3) (7)
Stock options exercised                 (18)    
Dividends declared on common stock                 (120) (120) (121)
Retained earnings (accumulated deficit) | Parent                      
Increase (Decrease) in Stockholders' Equity                      
Balance       (325)       (528) (325) (528) (493)
Net income                 636 326 93
Repurchase and cancellation of stock awards                 (12) (3) (7)
Stock options exercised                 (18)    
Dividends declared on common stock                 (120) (120) (121)
Balance 161       (325)       161 (325) (528)
Accumulated other comprehensive (loss) income                      
Increase (Decrease) in Stockholders' Equity                      
Other comprehensive income (loss)                 403 (383) (235)
Accumulated other comprehensive (loss) income | Parent                      
Increase (Decrease) in Stockholders' Equity                      
Balance       $ (1,671)       $ (1,288) (1,671) (1,288) (1,053)
Other comprehensive income (loss)                 403 (383) (235)
Balance $ (1,268)       $ (1,671)       $ (1,268) $ (1,671) $ (1,288)