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Long-term Debt - Schedule of Long-term Debt (Details) $ / shares in Units, $ in Millions		9 Months Ended
	Oct. 30, 2020 $ / shares	Sep. 30, 2020 USD ($)	Mar. 11, 2020	Dec. 31, 2019 USD ($)
Debt Instrument [Line Items]
Debt amount		$ 5,929		$ 6,042
Less current maturities		(3)		(88)
Less debt issuance costs		(59)		(65)
Discounts		(75)		(86)
Long-term debt		5,792		5,803
Recourse Debt
Debt Instrument [Line Items]
Debt amount		5,925		6,008
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	$ 46.24
Conversion rate	0.02162
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		$ 0		83
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		$ 4		34
Non Recourse Debt | Other
Debt Instrument [Line Items]
Debt amount		$ 4		$ 34

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