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Financial Derivative Instruments - Narrative (Details)
$ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2021
USD ($)
Dec. 31, 2020
USD ($)
aircraft
Mar. 31, 2021
aircraft
Dec. 31, 2019
aircraft
Derivative [Line Items]        
Net unrealized losses, net of taxes $ (88)      
Number of aircraft leases | aircraft   3 8  
Aircraft lease term 9 years      
Aircraft lease term 9 years      
Remaining AOCI associated with future aircraft deliveries $ 60      
Interest rate derivatives        
Derivative [Line Items]        
Cash collateral held (from) by CP $ 0      
Interest rate derivatives | Cash Flow Hedging | Fuel and oil        
Derivative [Line Items]        
Derivative deferred taxes   $ 0    
Interest rate swap        
Derivative [Line Items]        
Number of aircraft leases | aircraft       12