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Fair Value Measurements Fair Value, Assets Measured On Nonrecurring Basis, Valuation Techniques (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Mar. 31, 2020
Aircraft Value Publications    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair value of assets and liabilities measured on nonrecurring basis valuation techniques, median $ 18  
Aircraft Value Publications | Minimum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Range of fair value of assets measured on nonrecurring basis valuation techniques 15  
Aircraft Value Publications | Maximum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Range of fair value of assets measured on nonrecurring basis valuation techniques 24  
Aircraft Condition Adjustments    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Net fair value of assets measured on nonrecurring basis valuation techniques 0  
Aircraft Condition Adjustments | Minimum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Range of fair value of assets measured on nonrecurring basis valuation techniques (1)  
Aircraft Condition Adjustments | Maximum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Range of fair value of assets measured on nonrecurring basis valuation techniques 1  
Level 3 | Fair Value, Nonrecurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Assets, Fair Value Disclosure 18 $ 88
Valuation, Market Approach | Level 3 | Fair Value, Nonrecurring | Customer Financing Assets    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Assets, Fair Value Disclosure $ 18