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, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Operating Activities:                      
Net income $ 308 $ 41 $ 118 $ 131 $ (315) $ (8) $ 623 $ 350 $ 598 $ 650 $ 741
Equity in income of subsidiaries                 (54) (55) (13)
Stock-based compensation                 29 27 36
Net cash provided by operating activities                 897 1,207 1,219
Investing Activities:                      
Net cash used in investing activities                 (260) (973) (424)
Financing Activities:                      
Dividends paid to common stockholders (35) $ (38) $ (38) (39) (39) $ (39) $ (39) (39) (150) (156) (120)
Repurchase and cancellation of stock awards                 (12) (30) (12)
Proceeds from issuance of common stock                 2 17 35
Repurchase of common stock                 (208) (277)  
Net cash used in financing activities                 (450) (424) (519)
Increase in cash, cash equivalents and restricted cash                 185 (225) 294
Cash, cash equivalents and restricted cash from continuing operations at beginning of period       340       481 340 481 396
Cash, cash equivalents and restricted cash from continuing operations at end of period         340         340 481
Reportable legal entities | Parent                      
Operating Activities:                      
Net income                 562 337 636
Equity in income of subsidiaries                 (401) (163) (501)
Stock-based compensation                 1 1 1
Noncash interest income                 (15) (21) (16)
Changes in operating assets and liabilities                 13 19 10
Net cash provided by operating activities                 160 173 130
Investing Activities:                      
Loan to affiliate                     (47)
Repayments of loan by affiliate                 207 255  
Net cash used in investing activities                 207 255 (47)
Financing Activities:                      
Dividends paid to common stockholders                 (150) (156) (120)
Repurchase and cancellation of stock awards                 (12) (30) (12)
Proceeds from issuance of common stock                 2 17 35
Repurchase of common stock                 (208) (277)  
Increase in payable to affiliates                 1 16 15
Net cash used in financing activities                 (367) (430) (82)
Increase in cash, cash equivalents and restricted cash                   (2) 1
Cash, cash equivalents and restricted cash from continuing operations at beginning of period       $ 0       $ 2 0 2 1
Cash, cash equivalents and restricted cash from continuing operations at end of period $ 0       $ 0       $ 0 $ 0 $ 2