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Debt and Finance Leases - Schedule of Long-term Debt and Capital Leases (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	May 28, 2019	May 14, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Debt amount	$ 6,257				$ 6,691
Finance leases	0				1
Subtotal long-term debt and capital leases (including current maturities)	6,257				6,692
Less current maturities	(302)				(72)
Less debt issuance costs	(68)				(70)
Discounts	(89)				(101)
Long-term debt	5,798				$ 6,449
Finance lease interest rate					6.50%
Recourse Debt
Debt Instrument [Line Items]
Debt amount	6,140				$ 6,523
Recourse Debt | Senior Notes, due 2024
Debt Instrument [Line Items]
Debt amount	$ 0				733
Interest rate, stated percentage	6.25%	6.25%
Recourse Debt | Senior Notes, due 2026
Debt Instrument [Line Items]
Debt amount	$ 1,000				1,000
Interest rate, stated percentage	7.25%
Recourse Debt | Senior Notes, due 2027
Debt Instrument [Line Items]
Debt amount	$ 1,230				1,230
Interest rate, stated percentage	6.625%
Recourse Debt | Senior Notes, due 2028
Debt Instrument [Line Items]
Debt amount	$ 821				821
Interest rate, stated percentage	5.75%
Recourse Debt | Senior Notes, due 2029
Debt Instrument [Line Items]
Debt amount	$ 733				0
Interest rate, stated percentage	5.25%			5.25%
Recourse Debt | Convertible Senior Notes, due 2048
Debt Instrument [Line Items]
Debt amount	$ 575				575
Interest rate, stated percentage	2.75%
Recourse Debt | Senior Secured First Lien Notes, due 2024
Debt Instrument [Line Items]
Debt amount	$ 600				0
Interest rate, stated percentage	3.75%		3.75%
Recourse Debt | Senior Secured First Lien Notes, due 2029
Debt Instrument [Line Items]
Debt amount	$ 500				0
Interest rate, stated percentage	4.45%		4.45%
Recourse Debt | Term loan facility
Debt Instrument [Line Items]
Debt amount	$ 0				1,698
Recourse Debt | Term loan facility | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	1.75%
Recourse Debt | Tax-exempt bonds
Debt Instrument [Line Items]
Debt amount	$ 466				466
Recourse Debt | Tax-exempt bonds | Minimum
Debt Instrument [Line Items]
Interest rate, stated percentage	4.125%
Recourse Debt | Tax-exempt bonds | Maximum
Debt Instrument [Line Items]
Interest rate, stated percentage	6.00%
Line of Credit | Revolving Credit Facility | Credit Agreement
Debt Instrument [Line Items]
Debt amount	$ 215				0
Line of Credit | Revolving Credit Facility | Credit Agreement | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	1.75%
Line of Credit | Revolving Credit Facility | Credit Agreement | Prime Rate
Debt Instrument [Line Items]
Basis spread on variable rate	0.75%
Non Recourse Debt
Debt Instrument [Line Items]
Debt amount	$ 117				168
Non Recourse Debt | Agua Caliente Borrower 1, due 2038
Debt Instrument [Line Items]
Debt amount	$ 83				86
Interest rate, stated percentage	5.43%
Non Recourse Debt | Midwest Generation
Debt Instrument [Line Items]
Debt amount	$ 0				48
Interest rate, stated percentage	4.39%
Non Recourse Debt | Other
Debt Instrument [Line Items]
Debt amount	$ 34				$ 34

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