Crewmember Retirement Plan (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2025 |
Jun. 30, 2024 |
Jun. 30, 2025 |
Jun. 30, 2024 |
|
| Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] | ||||
| Percentage of employees pay (in percent) | 100.00% | |||
| Crewmember contribution percentage (in percent) | 5.00% | |||
| Percentage of compensation in cash | 3 years | |||
| Percentage of company contribution to pilots retirement program | 17.00% | |||
| Pilots retirement vesting period | 3 years | |||
| Defined contribution plan, cost | $ 74 | $ 61 | $ 149 | $ 127 |
| Retirement Non-elective Licensed | ||||
| Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] | ||||
| Crewmember contribution percentage (in percent) | 8.00% | |||
| Percentage of compensation in cash | 3 years | |||
| Retirement Non-elective Crewmember | ||||
| Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] | ||||
| Crewmember contribution percentage (in percent) | 5.00% | |||