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Fair Value Measurements - Fair Value, Assets Measured on Nonrecurring Basis, Valuation Techniques (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Mar. 31, 2023
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Aircraft value publications |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Range Median or Average | $ 23 |
Aircraft value publications | Minimum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Range Median or Average | 21 |
Aircraft value publications | Maximum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Range Median or Average | 27 |
Aircraft condition adjustments |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Range Median or Average | (8) |
Aircraft condition adjustments | Minimum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Range Median or Average | (8) |
Aircraft condition adjustments | Maximum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Range Median or Average | 0 |
Fair Value, Nonrecurring |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value | 33 |
Fair Value, Nonrecurring | Operating lease equipment |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value | 15 |
Level 3 | Fair Value, Nonrecurring |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value | 15 |
Valuation, Market Approach | Level 3 | Fair Value, Nonrecurring | Operating lease equipment |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value | $ 15 |

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