Fair Value Measurements - Fair Value, Assets Measured on Nonrecurring Basis, Valuation Techniques (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Aircraft value publications
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Range of fair value of assets measured on nonrecurring basis valuation techniques	$ 23
Aircraft value publications | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Range of fair value of assets measured on nonrecurring basis valuation techniques	21
Aircraft value publications | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Range of fair value of assets measured on nonrecurring basis valuation techniques	27
Aircraft condition adjustments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Range of fair value of assets measured on nonrecurring basis valuation techniques	(8)
Aircraft condition adjustments | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Range of fair value of assets measured on nonrecurring basis valuation techniques	(8)
Aircraft condition adjustments | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Range of fair value of assets measured on nonrecurring basis valuation techniques	0
Fair Value Measurements Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Assets, fair value disclosure	53	$ 14
Operating lease equipment | Fair Value Measurements Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Assets, fair value disclosure	15
Operating lease equipment | Level 3 | Fair Value Measurements Nonrecurring | Valuation, Market Approach
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Assets, fair value disclosure	$ 15