Annual report pursuant to Section 13 and 15(d)

Schedule I - Condensed Financial Information of Registrant - Condensed Income Statement (Details)

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Schedule I - Condensed Financial Information of Registrant - Condensed Income Statement (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
Operating costs and expenses                      
Operating and maintenance expense                 $ 292 $ 127 $ 62
Operating and maintenance expense—affiliate                 100 52 29
General and administrative expense                 12 13 15
General and administrative expense—affiliate                 80 90 122
Depreciation and amortization expense                 339 156 66
Total operating costs and expenses                 3,148 850 267
Other income (expense)                      
Interest expense, net of capitalized interest                 (614) (357) (185)
Loss on early extinguishment of debt                 (67) (72) (96)
Derivative gain, net                 4 6 (42)
Other income                 11 2 1
Total other expense                 (666) (421) (322)
Net income (loss) $ 374 $ 23 $ 46 $ 47 $ 86 $ (82) $ (100) $ (75) 490 (171) (319)
Parent Company [Member]                      
Operating costs and expenses                      
Operating and maintenance expense                 4 5 3
Operating and maintenance expense—affiliate                 6 0 0
General and administrative expense                 4 4 3
General and administrative expense—affiliate                 11 12 11
Depreciation and amortization expense                 2 1 0
Total operating costs and expenses                 27 22 17
Other income (expense)                      
Interest expense, net of capitalized interest                 (111) (23) 0
Loss on early extinguishment of debt                 (25) 0 0
Derivative gain, net                 6 12 0
Other income                 4 0 0
Equity income (loss) of affiliates                 643 (138) (302)
Total other expense                 517 (149) (302)
Net income (loss)                 $ 490 $ (171) $ (319)