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, 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
Other income (expense)                      
Interest expense, net                 $ (747) $ (488) $ (322)
Total other expense                 (822) (633) (648)
Net loss attributable to common stockholders $ 127 $ (289) $ (285) $ 54 $ 110 $ (101) $ (298) $ (321) (393) (610) (975)
Parent Company [Member]                      
Condensed Income Statements, Captions [Line Items]                      
General and administrative expense                 7 6 0
Other income (expense)                      
Interest expense, net                 (118) (104) (93)
Interest expense, net—affiliates                 0 (7) (9)
Interest income—affiliates                 0 24 34
Equity loss of affiliates                 (268) (517) (907)
Total other expense                 (386) (604) (975)
Net loss attributable to common stockholders                 $ (393) $ (610) $ (975)