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Long-term Debt and Finance Leases - Schedule of Long-term Debt and Finance Leases (Details) $ / shares in Units, $ in Millions		1 Months Ended	3 Months Ended
	Jan. 29, 2021 $ / shares	Apr. 30, 2021 $ / shares	Mar. 31, 2021 USD ($)	May 06, 2021 USD ($)	Dec. 31, 2020 USD ($)
Debt Instrument [Line Items]
Finance leases			$ 16		$ 4
Subtotal long-term debt and finance leases (including current maturities)			9,696		8,859
Less current maturities			(831)		(1)
Less debt issuance costs			(89)		(93)
Discounts			(71)		(74)
Total long-term debt			8,705		8,691
Recourse Debt
Debt Instrument [Line Items]
Subtotal long-term debt (including current maturities)			9,680		8,855
Recourse Debt | Senior Notes, due 2026
Debt Instrument [Line Items]
Subtotal long-term debt (including current maturities)			$ 1,000		1,000
Interest rate, stated percentage			7.25%
Recourse Debt | Senior Notes, due 2027
Debt Instrument [Line Items]
Subtotal long-term debt (including current maturities)			$ 1,230		1,230
Interest rate, stated percentage			6.625%
Recourse Debt | Senior Notes, due 2028
Debt Instrument [Line Items]
Subtotal long-term debt (including current maturities)			$ 821		821
Interest rate, stated percentage			5.75%
Recourse Debt | Senior Notes, due 2029
Debt Instrument [Line Items]
Subtotal long-term debt (including current maturities)			$ 733		733
Interest rate, stated percentage			5.25%
Recourse Debt | Senior Notes, due 2029
Debt Instrument [Line Items]
Subtotal long-term debt (including current maturities)			$ 500		500
Interest rate, stated percentage			3.375%
Recourse Debt | Senior Notes, due 2031
Debt Instrument [Line Items]
Subtotal long-term debt (including current maturities)			$ 1,030		1,030
Interest rate, stated percentage			3.625%
Recourse Debt | Convertible Senior Notes Due 2048
Debt Instrument [Line Items]
Subtotal long-term debt (including current maturities)			$ 575		575
Interest rate, stated percentage			2.75%
Convertible Notes, conversion price (in usd per share) | $ / shares	$ 45.91
Conversion rate	0.02179
Recourse Debt | Convertible Senior Notes Due 2048 | Subsequent Event
Debt Instrument [Line Items]
Convertible Notes, conversion price (in usd per share) | $ / shares		$ 45.54
Conversion rate		0.02196
Recourse Debt | Senior Secured First Lien Notes, due 2024
Debt Instrument [Line Items]
Subtotal long-term debt (including current maturities)			$ 600		600
Interest rate, stated percentage			3.75%
Recourse Debt | Senior Secured First Lien Notes, due 2025
Debt Instrument [Line Items]
Subtotal long-term debt (including current maturities)			$ 500		500
Interest rate, stated percentage			2.00%
Recourse Debt | Senior Secured First Lien Notes, due 2027
Debt Instrument [Line Items]
Subtotal long-term debt (including current maturities)			$ 900		900
Interest rate, stated percentage			2.45%
Recourse Debt | Senior Secured First Lien Notes, due 2029
Debt Instrument [Line Items]
Subtotal long-term debt (including current maturities)			$ 500		500
Interest rate, stated percentage			4.45%
Recourse Debt | Tax-exempt bonds
Debt Instrument [Line Items]
Subtotal long-term debt (including current maturities)			$ 466		466
Recourse Debt | Tax-exempt bonds | Minimum
Debt Instrument [Line Items]
Interest rate, stated percentage			1.25%
Recourse Debt | Tax-exempt bonds | Maximum
Debt Instrument [Line Items]
Interest rate, stated percentage			4.75%
Line of Credit | Revolving Credit Facility | Revolving Credit Facility
Debt Instrument [Line Items]
Subtotal long-term debt (including current maturities)			$ 750		0
Line of Credit | Revolving Credit Facility | Revolving Credit Facility | Subsequent Event
Debt Instrument [Line Items]
Subtotal long-term debt (including current maturities)				$ 70
Line of Credit | Revolving Credit Facility | Revolving Credit Facility | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate			1.72%
Non Recourse Debt | Repurchase Facility
Debt Instrument [Line Items]
Subtotal long-term debt (including current maturities)			$ 75		$ 0
Basis spread on variable rate			1.25%

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