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Fair Value Measurements Fair Value, Assets Measured On Nonrecurring Basis, Valuation Techniques (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Jun. 30, 2019
Aircraft Condition Adjustments    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Net fair value of assets measured on nonrecurring basis valuation techniques $ (8)  
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 (8)  
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 0  
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 79  
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 57  
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 118  
Level 3 | Fair Value, Nonrecurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Assets, Fair Value Disclosure 418 $ 126
Valuation, Market Approach | Level 3 | Fair Value, Nonrecurring | Operating Lease Equipment And Assets Held For Sale Or Re-Lease    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Assets, Fair Value Disclosure $ 71 $ 10