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Financial Derivative Instruments - Location and Amount Recognized in Income by Hedging Relationship (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Cash Flow Hedging        
Derivative [Line Items]        
Amount of loss reclassified from AOCI into income $ 129 $ (14) $ 407 $ (121)
Cash Flow Hedging | Fuel derivative contracts        
Derivative [Line Items]        
Amount of loss reclassified from AOCI into income 128 (17) 402 (91)
Cash Flow Hedging | Interest rate derivatives        
Derivative [Line Items]        
Amount of loss reclassified from AOCI into income 1 3 5 (30)
Fuel and oil        
Derivative [Line Items]        
Derivatives designated as hedging instruments 2 18 30 54
Fuel and oil | Cash Flow Hedging | Fuel derivative contracts        
Derivative [Line Items]        
Amount of loss reclassified from AOCI into income 2 18 30 54
Fuel and oil | Cash Flow Hedging | Interest rate derivatives        
Derivative [Line Items]        
Amount of loss reclassified from AOCI into income 0 0 0 0
Fuel and oil | Fair Value Hedging | Not Designated as Hedging Instrument | Interest rate derivatives        
Derivative [Line Items]        
Hedged items 0 0 0 0
Fuel and oil | Fair Value Hedging | Designated as Hedging Instrument | Interest rate derivatives        
Derivative [Line Items]        
Derivatives designated as hedging instruments 0 0 0 0
Other (gains)/losses, net        
Derivative [Line Items]        
Derivatives designated as hedging instruments 0 22 6 38
Other (gains)/losses, net | Cash Flow Hedging | Fuel derivative contracts        
Derivative [Line Items]        
Amount of loss reclassified from AOCI into income 0 22 6 38
Other (gains)/losses, net | Cash Flow Hedging | Interest rate derivatives        
Derivative [Line Items]        
Amount of loss reclassified from AOCI into income 0 0 0 0
Other (gains)/losses, net | Fair Value Hedging | Not Designated as Hedging Instrument | Interest rate derivatives        
Derivative [Line Items]        
Hedged items 0 0 0 0
Other (gains)/losses, net | Fair Value Hedging | Designated as Hedging Instrument | Interest rate derivatives        
Derivative [Line Items]        
Derivatives designated as hedging instruments 0 0 0 0
Other operating expenses        
Derivative [Line Items]        
Derivatives designated as hedging instruments 1      
Other operating expenses | Cash Flow Hedging | Fuel derivative contracts        
Derivative [Line Items]        
Amount of loss reclassified from AOCI into income 0      
Other operating expenses | Cash Flow Hedging | Interest rate derivatives        
Derivative [Line Items]        
Amount of loss reclassified from AOCI into income 1      
Other operating expenses | Fair Value Hedging | Not Designated as Hedging Instrument | Interest rate derivatives        
Derivative [Line Items]        
Hedged items 0      
Other operating expenses | Fair Value Hedging | Designated as Hedging Instrument | Interest rate derivatives        
Derivative [Line Items]        
Derivatives designated as hedging instruments $ 0      
Interest expense        
Derivative [Line Items]        
Derivatives designated as hedging instruments   2 4 6
Interest expense | Cash Flow Hedging | Fuel derivative contracts        
Derivative [Line Items]        
Amount of loss reclassified from AOCI into income   0 0 0
Interest expense | Cash Flow Hedging | Interest rate derivatives        
Derivative [Line Items]        
Amount of loss reclassified from AOCI into income   0 4 1
Interest expense | Fair Value Hedging | Not Designated as Hedging Instrument | Interest rate derivatives        
Derivative [Line Items]        
Hedged items   4 0 11
Interest expense | Fair Value Hedging | Designated as Hedging Instrument | Interest rate derivatives        
Derivative [Line Items]        
Derivatives designated as hedging instruments   $ (2) $ 0 $ (6)