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Fair Value Measurements - Fair Value, Assets Measured on Nonrecurring Basis, Valuation Techniques (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Dec. 31, 2023 | Jun. 30, 2023 | Dec. 31, 2022
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Fair Value, Nonrecurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items] |  |  |  |
Fair Value | $ 15 | $ 14 |  | $ 62
Fair Value, Nonrecurring | Operating lease equipment |  |  |  |
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items] |  |  |  |
Fair Value | 15 |  |  | $ 47
Valuation, Market Approach | Aircraft value publications |  |  |  |
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items] |  |  |  |
Range Median or Average | 23 |  |  |
Valuation, Market Approach | Aircraft condition adjustments |  |  |  |
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items] |  |  |  |
Range Median or Average | (8) |  |  |
Valuation, Market Approach | Minimum | Aircraft value publications |  |  |  |
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items] |  |  |  |
Range Median or Average | 21 |  |  |
Valuation, Market Approach | Minimum | Aircraft condition adjustments |  |  |  |
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items] |  |  |  |
Range Median or Average | (8) |  |  |
Valuation, Market Approach | Maximum | Aircraft value publications |  |  |  |
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items] |  |  |  |
Range Median or Average | 27 |  |  |
Valuation, Market Approach | Maximum | Aircraft condition adjustments |  |  |  |
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items] |  |  |  |
Range Median or Average | 0 |  |  |
Valuation, Market Approach | Level 3 | Fair Value, Nonrecurring | Operating lease equipment |  |  |  |
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items] |  |  |  |
Fair Value | $ 15 |  |  |

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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