Financial Derivative Instruments and Risk Management - Hedging Effectiveness (Details) - USD ($) $ in Millions |
12 Months Ended | ||
---|---|---|---|
Dec. 31, 2023 |
Dec. 31, 2022 |
Dec. 31, 2021 |
|
Derivative Instruments, Gain (Loss) [Line Items] | |||
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Fuel Costs | ||
Aircraft Fuel Derivatives | |||
Derivative Instruments, Gain (Loss) [Line Items] | |||
Hedge effectiveness gains (losses) recognized in aircraft fuel expense | $ 7 | $ (7) | $ 0 |
Percentage of actual consumption economically hedged | 25.00% | 7.00% | 0.00% |
Aircraft Fuel Derivatives | Comprehensive Income | |||
Derivative Instruments, Gain (Loss) [Line Items] | |||
Hedge gains (losses) on derivatives recognized in comprehensive income | $ 1 | $ (3) | $ 0 |