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Fair Value Measurements Fair Value, Assets Measured On Nonrecurring Basis, Valuation Techniques (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Sep. 30, 2019
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 $ 110  
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 79  
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 161  
Aircraft Condition Adjustments    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Net fair value of assets measured on nonrecurring basis valuation techniques (10)  
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 (13)  
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 3  
Level 3 | Fair Value, Nonrecurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Assets, Fair Value Disclosure 431 $ 105
Valuation, Market Approach | Level 3 | Fair Value, Nonrecurring | Customer Financing Assets    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Assets, Fair Value Disclosure $ 100 $ 10