Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Fair Value Measurements - Fair Value, Assets Measured on Nonrecurring Basis, Valuation Techniques (Details) - USD ($) $ in Millions	Mar. 31, 2026	Mar. 31, 2025
Fair Value, Nonrecurring
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	$ 22	$ 5
Fair Value, Nonrecurring \| Operating lease equipment
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	22
Valuation, Market Approach \| Aircraft value publications
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range Median or Average	22
Valuation, Market Approach \| Minimum \| Aircraft value publications
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range Median or Average	21
Valuation, Market Approach \| Maximum \| Aircraft value publications
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range Median or Average	24
Valuation, Market Approach \| Level 3 \| Fair Value, Nonrecurring \| Operating lease equipment
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	$ 22