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, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Operating Activities:                      
Net income $ (315) $ (8) $ 623 $ 350 $ 287 $ 179 $ 183 $ 92 $ 650 $ 741 $ 357
Equity in (income) loss of subsidiaries                 (55) (13) (5)
Stock-based compensation                 27 36 32
Net cash provided by operating activities                 1,207 1,219 1,088
Investing Activities:                      
Net cash used in investing activities                 (973) (424) (203)
Financing Activities:                      
Dividends paid to common stockholders (39) $ (39) $ (39) (39) (30) $ (30) $ (30) (30) (156) (120) (120)
Repurchase and cancellation of stock awards                 (30) (12) (3)
Proceeds from issuance of common stock                 17 35 1
Repurchase of common stock                 (277)    
Other, net                 1 1 (1)
Net cash used in financing activities                 (424) (519) (723)
(Decrease) increase in cash, cash equivalents and restricted cash                 (225) 294 156
Cash, cash equivalents and restricted cash from continuing operations at beginning of period       481       396 481 396 248
Cash, cash equivalents and restricted cash from continuing operations at end of period         481         481 396
Parent                      
Operating Activities:                      
Net income                 337 636 326
Equity in (income) loss of subsidiaries                 (163) (501) (196)
Stock-based compensation                 1 1 1
Noncash interest income                 (21) (16) (12)
Changes in operating assets and liabilities                 19 10 9
Net cash provided by operating activities                 173 130 128
Investing Activities:                      
Loan to affiliate                   (47)  
Proceeds from loan repayment by affiliate                 255   1
Net cash used in investing activities                 255 (47) 1
Financing Activities:                      
Dividends paid to common stockholders                 (156) (120) (120)
Repurchase and cancellation of stock awards                 (30) (12) (3)
Proceeds from issuance of common stock                 17 35 1
Repurchase of common stock                 (277)    
Increase (decrease) in payable to affiliates                 16 15 (6)
Net cash used in financing activities                 (430) (82) (128)
(Decrease) increase in cash, cash equivalents and restricted cash                 (2) 1 1
Cash, cash equivalents and restricted cash from continuing operations at beginning of period       $ 2       $ 1 2 1 0
Cash, cash equivalents and restricted cash from continuing operations at end of period $ 0       $ 2       $ 0 $ 2 $ 1