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Long-term Debt - Schedule of Long-term Debt (Details) $ / shares in Units, $ in Millions		12 Months Ended
	Jul. 31, 2020 $ / shares	Dec. 31, 2019 USD ($)	Jun. 30, 2020 USD ($)	Mar. 11, 2020
Debt Instrument [Line Items]
Debt amount		$ 6,042	$ 5,957
Long-term Debt, Current Maturities		(88)	(7)
Less debt issuance costs		(65)	(61)
Discounts		(86)	(79)
Long-term debt		5,803	5,810
Recourse Debt
Debt Instrument [Line Items]
Debt amount		6,008	5,925
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	$ 733
Interest rate, stated percentage			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 | Convertible Senior Notes Due 2048 | Subsequent Event
Debt Instrument [Line Items]
Convertible Notes, conversion price (in usd per share) | $ / shares	$ 46.65
Conversion rate	0.02144
Recourse Debt | Senior Secured First Lien Notes, due 2024
Debt Instrument [Line Items]
Debt amount		600	$ 600
Interest rate, stated percentage			3.75%
Recourse Debt | Senior Secured First Lien Notes, due 2029
Debt Instrument [Line Items]
Debt amount		500	$ 500
Interest rate, stated percentage			4.45%
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			1.30%	1.30%
Recourse Debt | Tax-exempt bonds | Maximum
Debt Instrument [Line Items]
Interest rate, stated percentage			6.00%
Line of Credit | Revolving Credit Facility | Revolver Facility
Debt Instrument [Line Items]
Debt amount		$ 83	$ 0
Line of Credit | Revolving Credit Facility | Revolver Facility | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate		1.75%
Non Recourse Debt
Debt Instrument [Line Items]
Debt amount		$ 34	32
Non Recourse Debt | Other
Debt Instrument [Line Items]
Debt amount		$ 34	$ 32

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