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Fair Value Measurements Fair Value, Assets Measured On Nonrecurring Basis, Valuation Techniques (Details) - USD ($)
$ in Millions
Sep. 30, 2022
Sep. 30, 2021
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 $ 46  
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 40  
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 51  
Aircraft Condition Adjustments    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Net fair value of assets measured on nonrecurring basis valuation techniques 1  
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 (4)  
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 5  
Fair Value, Nonrecurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Assets, Fair Value Disclosure 48 $ 120
Level 3 | Fair Value, Nonrecurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Assets, Fair Value Disclosure 48 17
Valuation, Market Approach | Fair Value, Nonrecurring | Customer Financing Assets    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Assets, Fair Value Disclosure 47 17
Valuation, Market Approach | Level 3 | Fair Value, Nonrecurring | Customer Financing Assets    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Assets, Fair Value Disclosure $ 47 $ 17