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Debt Financing - Narrative (Details)		1 Months Ended			6 Months Ended
	Jan. 21, 2025 USD ($)	Apr. 30, 2025 USD ($)	Jan. 31, 2025 USD ($)	Dec. 31, 2024 USD ($) aircraft	Jun. 30, 2025 USD ($) facility aircraft	Jun. 30, 2024 USD ($)	Aug. 04, 2025 USD ($)	May 30, 2025 USD ($)	May 05, 2025 USD ($)
Debt Instrument [Line Items]
Composite interest rate				4.14%	4.28%
Debt outstanding				$ 20,389,907,000	$ 20,478,032,000
Proceeds from debt financings					433,074,000	$ 3,024,408,000
Senior unsecured securities
Debt Instrument [Line Items]
Debt outstanding				16,046,662,000	14,718,630,000
Proceeds from debt financings					0
Revolving Credit Facility
Debt Instrument [Line Items]
Debt outstanding				170,000,000	$ 0
Maximum borrowing capacity									$ 8,200,000,000
Interest margin					1.05%
Facility fee					0.20%
Increase in maximum borrowing capacity								$ 250,000,000
Revolving Credit Facility | Subsequent Event
Debt Instrument [Line Items]
Line of credit, noncurrent							$ 8,400,000,000
Revolving Credit Facility | Mature May 5, 2029 | Subsequent Event
Debt Instrument [Line Items]
Line of credit, noncurrent							8,000,000,000
Revolving Credit Facility | Mature May 5, 2028 | Subsequent Event
Debt Instrument [Line Items]
Line of credit, noncurrent							125,000,000
Revolving Credit Facility | Mature May 5, 2027 | Subsequent Event
Debt Instrument [Line Items]
Line of credit, noncurrent							25,000,000
Revolving Credit Facility | Mature May 5, 2026 | Subsequent Event
Debt Instrument [Line Items]
Line of credit, noncurrent							$ 210,000,000
Tranche B
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 250,000,000
Other revolving credit facilities
Debt Instrument [Line Items]
Debt outstanding				$ 0	$ 400,000,000
Number of unsecured revolving credit facilities | facility					2
Three-Month Term SOFR
Debt Instrument [Line Items]
Debt outstanding					$ 200,000,000
Interest margin					1.25%
Two-Month Term SOFR
Debt Instrument [Line Items]
Debt outstanding					$ 200,000,000
Interest margin					1.05%
Unsecured Term Loan Due 2026 | Total unsecured debt financing
Debt Instrument [Line Items]
Interest margin			1.15%
Aggregate principal amount			$ 100,000,000
Debt instrument, term			1 year
Credit spread adjustment			0.10%
Unsecured Term Loan Due 2027 | Total unsecured debt financing
Debt Instrument [Line Items]
Interest margin		1.03%
Aggregate principal amount		$ 200,000,000
Unsecured Term Loan Due December 2027 | Total unsecured debt financing
Debt Instrument [Line Items]
Interest margin				1.125%
Aggregate principal amount				$ 966,500,000
Debt instrument, term				3 years
Additional commitments		$ 33,500,000
Term financings
Debt Instrument [Line Items]
Debt outstanding				$ 3,628,600,000	$ 3,893,200,000
Secured Debt
Debt Instrument [Line Items]
Debt outstanding				$ 544,645,000	$ 530,202,000
Number of aircraft pledged as collateral | aircraft				10	10
Net book value of aircraft pledged as collateral				$ 772,700,000	$ 743,800,000
Commercial paper
Debt Instrument [Line Items]
Debt outstanding				$ 0	$ 936,000,000
Maximum commercial paper amount outstanding	$ 2,000,000,000
Weighted average interest rate					4.91%
Weighted average maturity					1 month

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