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Long-term Debt and Finance Leases - Recourse Debt (Details) - Revolving Credit Facility - Line of Credit - Credit agreement - USD ($)	3 Months Ended
	Sep. 30, 2020	May 06, 2021	Mar. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Increase revolving commitments	$ 802,000,000
Revolving credit commitments	$ 273,000,000
Debt term	30 months
Debt extension, term	12 months
Total revolving commitments available			$ 3,700,000,000
Subtotal long-term debt (including current maturities)			$ 750,000,000	$ 0
Subsequent Event
Debt Instrument [Line Items]
Subtotal long-term debt (including current maturities)		$ 70,000,000

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- Definition

Debt Instrument, Extension Term

+ References

No definition available.

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- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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