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Debt (ILFC) (Details) - USD ($)	Dec. 31, 2020	Aug. 31, 2020	Jul. 31, 2020	Jun. 30, 2020	Dec. 31, 2019
Maturities of Long-term Debt [Abstract]
2021	$ 2,373,410,000
2022	4,802,146,000
Commitment	34,531,538,000
Unsecured
Maturities of Long-term Debt [Abstract]
Debt	15,776,730,000				$ 17,523,093,000
Commitment	20,705,014,000
Unsecured | ILFC Legacy Notes
Maturities of Long-term Debt [Abstract]
2021	164,614,000
2022	1,034,274,000
Debt	1,198,888,000				$ 2,900,000,000
Commitment	$ 1,198,888,000
Unsecured | Senior Notes Due 2020
Maturities of Long-term Debt [Abstract]
Debt		$ 999,000,000.0		$ 500,000,000.0
Stated interest rate		4.625%	8.25%	4.25%
Commitment			$ 742,100,000
Unsecured | Senior Notes Due 2022
Maturities of Long-term Debt [Abstract]
Stated interest rate			8.625%
Commitment			$ 365,700,000
Unsecured | Senior Notes due 2021
Maturities of Long-term Debt [Abstract]
Stated interest rate			4.625%
Commitment			$ 334,500,000
Unsecured | Senior Notes
Maturities of Long-term Debt [Abstract]
Debt Instrument, repurchase amount			$ 1,500,000,000
Minimum | Unsecured | ILFC Legacy Notes
Maturities of Long-term Debt [Abstract]
Stated interest rate	4.625%
Maximum | Unsecured | ILFC Legacy Notes
Maturities of Long-term Debt [Abstract]
Stated interest rate	8.625%

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Long Term Debt Composed Of Either Debt Instrument Face Amount Or Line Of Credit Facility Current Borrowing Capacity

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Fair value amount of debt instrument that was repurchased.

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Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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