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Long-term Debt and Finance Leases - Recourse Debt (Details) - USD ($)				1 Months Ended	3 Months Ended		9 Months Ended
	Aug. 24, 2021	Aug. 23, 2021	Jul. 26, 2021	Nov. 04, 2021	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Debt Instrument [Line Items]
Aggregate principal redeemed	$ 1,400,000,000
Cash paid	1,400,000,000
Loss on debt extinguishment, net	$ 57,000,000				$ (57,000,000)	$ 0	$ (57,000,000)	$ (1,000,000)
Write off of previously deferred debt issuance costs							9,000,000
Senior Notes, due 2032
Debt Instrument [Line Items]
Debt issuance amount		$ 1,100,000,000
Interest rate, stated percentage		3.875%
Increase basis point, interest rate payable if sustainability targets not met		0.25%
Senior Notes, due 2026
Debt Instrument [Line Items]
Interest rate, stated percentage	7.25%
Aggregate principal redeemed	$ 1,000,000,000
Cash paid	$ 1,056,000,000
Senior Notes, due 2027
Debt Instrument [Line Items]
Interest rate, stated percentage	6.625%
Aggregate principal redeemed	$ 355,000,000
Cash paid	$ 369,000,000
Senior Notes, due 2027 | Subsequent Event
Debt Instrument [Line Items]
Interest rate, stated percentage				6.625%
Aggregate principal redeemed				$ 500,000,000
Cash paid				$ 524,000,000
Receivables Facility | Revolving Credit Facility
Debt Instrument [Line Items]
Increase to existing revolving commitments			$ 50,000,000
Revolving credit commitments			$ 800,000,000						$ 750,000,000
Borrowings outstanding					0		0
Letters of credit issued					400,000,000		400,000,000
Repurchase Facility | Revolving Credit Facility
Debt Instrument [Line Items]
Revolving credit commitments									75,000,000
Credit agreement | Revolving Credit Facility | Line of Credit
Debt Instrument [Line Items]
Revolving credit commitments									$ 273,000,000
Increase revolving commitments						$ 802,000,000
Total revolving commitments available					$ 3,700,000,000		$ 3,700,000,000

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