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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
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