Annual report pursuant to Section 13 and 15(d)

Schedule I - Condensed Financial Information of Registrant - Condensed Statements of Operations (Details)

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Schedule I - Condensed Financial Information of Registrant - Condensed Statements of Operations (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
Other income (expense)                      
Interest expense, net                 $ (1,432) $ (875) $ (747)
Equity in income (loss) of subsidiaries                 (88) 0 0
Total other expense                 (1,646) (797) (822)
Income (Loss) before income taxes                 715 1,227 566
Income tax benefit                 517 (27) (3)
Net income (loss) attributable to common stockholders $ 939 $ (318) $ (114) $ 141 $ 67 $ 65 $ (18) $ 357 648 471 (393)
Parent Company [Member]                      
Condensed Income Statements, Captions [Line Items]                      
General and administrative expense                 17 8 7
Other income (expense)                      
Interest expense, net                 (141) (128) (118)
Interest income                 1 0 0
Equity in income (loss) of subsidiaries                 490 [1] 607 (268)
Total other expense                 350 479 (386)
Income (Loss) before income taxes                 333 471 (393)
Income tax benefit                 315 0 0
Net income (loss) attributable to common stockholders                 $ 648 $ 471 $ (393)
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(1)
Amounts represent equity income (losses) of affiliates.