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AOCI - Schedule of AOCI Components (Details)
$ in Millions
 3 Months Ended
Mar. 31, 2021
USD ($)
AOCI Attributable to Parent, Net of Tax [Roll Forward]  
Cumulative effect of new accounting standards $ 0
Fuel derivatives  
AOCI Attributable to Parent, Net of Tax [Roll Forward]  
Beginning Balance (119)
Cumulative effect of new accounting standards 0
Changes in fair value 109
Ending Balance 12
Interest rate derivatives  
AOCI Attributable to Parent, Net of Tax [Roll Forward]  
Beginning Balance (66)
Cumulative effect of new accounting standards 0
Changes in fair value 12
Reclassification to earnings 1
Ending Balance (53)
Defined Benefit Plan Items  
AOCI Attributable to Parent, Net of Tax [Roll Forward]  
Beginning Balance (43)
Cumulative effect of new accounting standards 0
Changes in fair value 0
Reclassification to earnings 0
Ending Balance (43)
Other comprehensive income (loss) other changes net of tax  
AOCI Attributable to Parent, Net of Tax [Roll Forward]  
Beginning Balance 91
Cumulative effect of new accounting standards (31)
Changes in fair value 0
Ending Balance 0
Deferred Tax  
AOCI Attributable to Parent, Net of Tax [Roll Forward]  
Beginning Balance 32
Cumulative effect of new accounting standards 12
Changes in fair value (28)
Reclassification to earnings 8
Ending Balance 24
AOCI Including Portion Attributable to Noncontrolling Interest  
AOCI Attributable to Parent, Net of Tax [Roll Forward]  
Beginning Balance (105)
Cumulative effect of new accounting standards (19)
Changes in fair value 93
Reclassification to earnings (29)
Ending Balance (60)
Reclassification out of Accumulated Other Comprehensive Income (Loss) | Fuel derivatives  
AOCI Attributable to Parent, Net of Tax [Roll Forward]  
Reclassification to earnings $ 22