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Financial Derivative Instruments - (Gain) Loss by Hedging Relationship (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Cash Flow Hedging    
Derivative Instruments, Gain (Loss) [Line Items]    
(Gain) Loss recognized in AOCI on derivatives (effective portion) $ 79 $ 41
(Gain) Loss reclassified from AOCI into income (effective portion) [1] 90 197
(Gain) Loss recognized in income on derivatives (ineffective portion) [2] 14 4
Fuel derivatives | Cash Flow Hedging    
Derivative Instruments, Gain (Loss) [Line Items]    
(Gain) Loss recognized in AOCI on derivatives (effective portion) [3] 79 36
(Gain) Loss reclassified from AOCI into income (effective portion) [1],[3] 88 195
(Gain) Loss recognized in income on derivatives (ineffective portion) [2] 14 4
Interest rate derivatives | Cash Flow Hedging    
Derivative Instruments, Gain (Loss) [Line Items]    
(Gain) Loss recognized in AOCI on derivatives (effective portion) [3] 0 5
(Gain) Loss reclassified from AOCI into income (effective portion) [1],[3] 2 2
(Gain) Loss recognized in income on derivatives (ineffective portion) [2] 0 0
Other Nonoperating Income Expense | Not Designated as Hedging Instrument    
Derivative Instruments, Gain (Loss) [Line Items]    
(Gain) loss recognized in income on derivatives 50 76
Other Nonoperating Income Expense | Fuel derivatives | Not Designated as Hedging Instrument    
Derivative Instruments, Gain (Loss) [Line Items]    
(Gain) loss recognized in income on derivatives 51 76
Other Nonoperating Income Expense | Interest rate derivatives | Not Designated as Hedging Instrument    
Derivative Instruments, Gain (Loss) [Line Items]    
(Gain) loss recognized in income on derivatives $ (1) $ 0
[1] Amounts related to fuel derivative contracts and interest rate derivatives, which are included in Fuel and oil and Interest expense, respectively.
[2] Amounts are included in Other (gains) losses, net.
[3] Net of tax