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Financial Derivative Instruments Narrative (Details)
$ in Millions
12 Months Ended
Dec. 31, 2020
USD ($)
aircraft
Agreements
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Derivative [Line Items]      
Percentage of actual consumption hedged 77.00%    
Current Unrealized Net Loss in OCI $ 54    
Maximum sum of derivatives of counterparty to be included in other (less than $10 million) $ 10    
Cash collateral provided as a percentage of derivative contract value (in hundredths) 100.00%    
Derivative Asset, Fair Value, Gross Asset $ 134 $ 112  
Derivative Liability, Fair Value, Gross Liability 6 6  
Payments of terminated interest rate derivative instruments $ 59 $ 0 $ 0
Interest Rate Swap Derivative, Aircraft Leases Received in December 2020 | aircraft 3    
Term Loan Agreement Due 2020 [Member]      
Derivative [Line Items]      
Interest rate stated in the debt agreement (in hundredths) 5.223% 5.223%  
Unsecured Senior Notes Due 2027      
Derivative [Line Items]      
Interest rate stated in the debt agreement (in hundredths) 3.45%    
2.65% Notes due 2020      
Derivative [Line Items]      
Interest rate stated in the debt agreement (in hundredths) 2.65%    
Unsecured Debt | Unsecured Senior Notes Due 2027      
Derivative [Line Items]      
Interest rate stated in the debt agreement (in hundredths) 3.45%    
Unsecured Debt | 2.65% Notes due 2020      
Derivative [Line Items]      
Interest rate stated in the debt agreement (in hundredths) 2.65%    
Fuel derivatives      
Derivative [Line Items]      
Collateral Already Posted, Aggregate Fair Value $ 34    
Total collateral already posted aggregate fair value 34 $ 25  
Interest rate derivatives      
Derivative [Line Items]      
Discontinuation of Interest Rate Cash Flow Hedge Balance in AOCI $ 32    
Interest Rate Swaption [Member]      
Derivative [Line Items]      
Interest Rate Swap Derivative, Aircraft Leases 12 12  
Designated as Hedging Instrument      
Derivative [Line Items]      
Derivative Asset, Fair Value, Gross Asset $ 130 $ 112  
Derivative Liability, Fair Value, Gross Liability 6 6  
Not Designated as Hedging Instrument | Fuel derivatives      
Derivative [Line Items]      
Loss on Discontinuation of Cash Flow Hedge Due to Forecasted Transaction Probable of Not Occurring 39    
Not Designated as Hedging Instrument | Interest rate derivatives      
Derivative [Line Items]      
Discontinuation of Interest Rate Cash Flow Hedge Balance in AOCI 31    
(Gain) Loss on Interest Rate Derivative Instruments Not Designated as Hedging Instruments 28    
Other Noncurrent Liabilities | Interest rate derivatives      
Derivative [Line Items]      
Collateral Already Posted, Aggregate Fair Value 0 0  
Derivative Liability, Fair Value, Gross Liability 6    
Other Noncurrent Liabilities | Designated as Hedging Instrument | Interest rate derivatives      
Derivative [Line Items]      
Derivative Liability, Fair Value, Gross Liability [1] 6 1  
Other Assets | Designated as Hedging Instrument | Fuel derivatives      
Derivative [Line Items]      
Derivative Asset, Fair Value, Gross Asset [1] 121 62  
Other Assets | Designated as Hedging Instrument | Interest rate derivatives      
Derivative [Line Items]      
Derivative Asset, Fair Value, Gross Asset [1] $ 0 $ 2  
[1] Represents the position of each trade before consideration of offsetting positions with each counterparty and does not include the impact of cash collateral deposits provided to or received from counterparties. See discussion of credit risk and collateral following in this Note.