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Financial Derivative Instruments Narrative (Details)
$ in Millions
3 Months Ended
Mar. 31, 2021
USD ($)
aircraft
Mar. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
Derivative [Line Items]      
Discontinuation of Interest Rate Cash Flow Hedge Balance in AOCI $ 62    
Current Unrealized Net Losses in OCI 19    
Maximum sum of derivatives of counterparty to be included in other $ 4    
Cash Collateral Percent Of Fair Value Fuel Derivatives Contracts 100.00%    
Letter of Credit Percent of Collateral 100.00%    
Interest Rate Swap Derivative, Aircraft Leases Received in December 2020 | aircraft 3    
Interest Rate Swap Derivative, Aircraft Leases Received in First Quarter 2021 8    
Fuel derivatives      
Derivative [Line Items]      
Cash collateral held (from) by CP $ 72    
Fuel derivatives | Cash Flow Hedging | Operating Expense [Member]      
Derivative [Line Items]      
Derivative Instruments, (Gain) Loss Reclassified from Accumulated OCI into Income, Effective Portion, Net $ 0    
Interest rate swap      
Derivative [Line Items]      
Interest Rate Derivative 12    
Interest rate derivatives      
Derivative [Line Items]      
Cash collateral held (from) by CP $ 0    
Interest rate derivatives | Cash Flow Hedging | Operating Expense [Member]      
Derivative [Line Items]      
Derivative Instruments, (Gain) Loss Reclassified from Accumulated OCI into Income, Effective Portion, Net 1 $ 0  
Other Noncurrent Liabilities | Interest rate derivatives      
Derivative [Line Items]      
Derivative contracts $ 0   $ 6