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Commitments and contingencies - Narrative (Details) $ in Millions |  |  | 1 Months Ended |  |
--- | --- | --- | --- | --- | ---
Sep. 28, 2021 USD ($) | Jun. 30, 2021 USD ($) | May 02, 2022 aircraft | Apr. 30, 2022 USD ($) | Mar. 31, 2022 USD ($) aircraft
Other Commitments [Line Items] |  |  |  |  |
Decrease in operating lease liability |  | $ 343 |  |  |
Aircrafts to be purchased | aircraft |  |  |  |  | 632
Leaseholds and Leasehold Improvements |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |
Construction payments |  | $ 343 |  |  |
Subsequent Event | Capital Addition Purchase Commitments |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |
2022 |  |  |  | $ 689 |
2023 |  |  |  | $ 188 |
Cash Capital Commitments, Boeing Orders |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |
Remainder of 2022 |  |  |  |  | $ 2,100
2023 |  |  |  |  | 1,900
2024 |  |  |  |  | 1,000
2025 |  |  |  |  | 839
2026 |  |  |  |  | 975
2027 |  |  |  |  | 1,000
Thereafter |  |  |  |  | 6,000
Payment Guarantee, Dallas Love Field Series 2010 Bonds |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |
Principal amount of guarantee |  |  |  |  | 79
Net present value of future principal and interest payments |  |  |  |  | $ 89
-8 Firm Orders |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |
Aircrafts to be purchased | aircraft |  |  |  |  | 145
-8 Firm Orders | Subsequent Event |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |
Converted, 2022 | aircraft |  |  | 1 |  |
Exercised, 2022 | aircraft |  |  | 16 |  |
Exercised, 2023 | aircraft |  |  | 10 |  |
-7 Firm Orders |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |
Aircrafts to be purchased | aircraft |  |  |  |  | 276
-7 Firm Orders | Subsequent Event |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |
Converted, 2022 | aircraft |  |  | 40 |  |
Converted, 2023 | aircraft |  |  | 1 |  |
Exercised, 2023 | aircraft |  |  | 2 |  |
Shifted, 2023 | aircraft |  |  | 10 |  |
B-737-8 MAX |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |
Aircrafts to be purchased | aircraft |  |  |  |  | 15
B737-7Max |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |
Aircrafts to be purchased | aircraft |  |  |  |  | 12
Love Field Airport Modernization Corporation | Series 2010 Bonds |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |
Debt redeemed | $ 310 |  |  |  |
Interest expense | $ 7 |  |  |  |

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