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, 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
Other income (expense)                      
Interest expense, net                 $ (875) $ (747) $ (488)
Total other income (expense)                 (797) (822) (633)
Net income (loss) attributable to common stockholders $ 67 $ 65 $ (18) $ 357 $ 127 $ (289) $ (285) $ 54 471 (393) (610)
Parent Company [Member]                      
Condensed Income Statements, Captions [Line Items]                      
General and administrative expense                 8 7 6
Other income (expense)                      
Interest expense, net                 (128) (118) (104)
Interest expense, net—affiliates                 0 0 (7)
Interest income—affiliates                 0 0 24
Equity income (loss) of affiliates                 607 (268) (517)
Total other income (expense)                 479 (386) (604)
Net income (loss) attributable to common stockholders                 $ 471 $ (393) $ (610)