Annual report pursuant to Section 13 and 15(d)

Schedule I - Condensed Financial Information of Registrant (PARENT ONLY) - STATEMENTS OF CASH FLOWS (Details)

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Schedule I - Condensed Financial Information of Registrant (PARENT ONLY) - STATEMENTS OF CASH FLOWS (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
Operating Activities:                      
Net income $ 287 $ 179 $ 183 $ 92 $ 137 $ 64 $ 94 $ 62 $ 741 $ 357 $ 126
Equity in (income) loss of subsidiaries                 (13) (5) (6)
Stock-based compensation                 36 32 29
Net cash provided by operating activities                 1,219 1,088 575
Investing Activities:                      
Net cash (used in) provided by investing activities                 (424) (202) (600)
Financing Activities:                      
Dividends paid to common stockholders (30) $ (30) $ (30) (30) (30) $ (30) $ (30) (30) (120) (120) (121)
Repurchase and cancellation of stock awards                 (12) (3) (7)
Proceeds from issuance of common stock                 35 1 1
Repurchase of common stock                     (100)
Other, net                 1 (1)  
Net cash used in financing activities                 (519) (723) (562)
Increase in cash and cash equivalents                 294 157 (603)
Cash and cash equivalents at beginning of period       385 [1]       $ 236 385 [1] 236 825
Cash and cash equivalents at end of period 470 [1]       385 [1]       470 [1] 385 [1] 236
Parent                      
Operating Activities:                      
Net income                 636 326 93
Equity in (income) loss of subsidiaries                 (504) (199) 32
Stock-based compensation                 1 1 1
Noncash interest income                 (16) (12) (9)
Changes in operating assets and liabilities                 13 12 8
Net cash provided by operating activities                 130 128 125
Investing Activities:                      
Loan to affiliate                 (47)   (195)
Repayments of loan by affiliate                   1 148
Net cash (used in) provided by investing activities                 (47) 1 (47)
Financing Activities:                      
Dividends paid to common stockholders                 (120) (120) (121)
Repurchase and cancellation of stock awards                 (12) (3) (7)
Proceeds from issuance of common stock                 35 1 1
Repurchase of common stock                     (100)
Increase (decrease) in payable to affiliates                 15 (6) (1)
Net cash used in financing activities                 (82) (128) (228)
Increase in cash and cash equivalents                 1 1 (150)
Cash and cash equivalents at beginning of period       $ 1         1   $ 150
Cash and cash equivalents at end of period $ 2       $ 1       $ 2 $ 1  
[1] At December 31, 2017 and December 31, 2016, respectively, $15 and $20 of cash and cash equivalents, $11 and $10 of restricted cash, $35 and $21 of accounts and notes receivable (net), $46 and $45 of inventories, $7 and $5 of other current assets, $283 and $279 of property, plant and equipment (net), $10 each of intangible assets (net), $43 and $37 of other noncurrent assets, $109 and $89 of accounts payable, $32 and $30 of accrued liabilities, $21 and $12 of current portion of debt, $86 and $114 of longterm debt, and $98 and $76 of other noncurrent liabilities from consolidated variable interest entities are included in the respective Balance Sheet captions above. See “Note 7. Variable Interest Entities.”