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Significant Accounting Policies - Narrative (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2022 USD ($) segment | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Summary Of Significant Accounting Policies [Line Items] |  |  |
Expiration period for refundable tickets | 1 year |  |
Number of operating segments | segment | 1 |  |
Revenue | $ 44,955 | $ 24,634 | $ 15,355
Period over which miles are expected to be redeemed | two years |  |
Senior secured notes | $ 6,100 |  |
Carrying value of computer software | 471 | 499 |
Impairment, long-lived asset |  | $ 97 | $ 94
Impairment, Long-Lived Asset, Held-for-Use, Statement of Income or Comprehensive Income [Extensible Enumeration] |  | Restructuring, Settlement and Impairment Provisions | Restructuring, Settlement and Impairment Provisions
Amortization expense | 41 | $ 49 | $ 55
Projected amortization expense in 2023 | 37 |  |
Projected amortization expense in 2024 | 32 |  |
Projected amortization expense in 2025 | 28 |  |
Projected amortization expense in 2026 | 18 |  |
Projected amortization expense in 2027 | 11 |  |
Advertising expense | $ 165 | 99 | 87
Minimum |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Frequent flier program expiration period | 1 year |  |
Maximum |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Frequent flier program expiration period | 7 years |  |
Computer software |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Depreciation expense | $ 166 | 182 | 172
Advance Ticket Sales |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Expiration period for advance ticket sales | 12 months |  |
Revenue recognized | $ 3,300 | 1,800 | 3,000
Ancillary Fees Recorded within Passenger Revenues |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Revenue | 3,400 | 2,200 | 1,300
Other Operating Revenue |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Revenue | 2,752 | 2,088 | 1,902
Other Operating Revenue | Chase and Other Partner Agreements |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Revenue | $ 2,400 | $ 1,800 | $ 1,700

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