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Commitments and contingencies - Narrative (Details)
$ in Millions
1 Months Ended 3 Months Ended
Sep. 28, 2021
USD ($)
Aug. 01, 2022
aircraft
Jun. 30, 2022
USD ($)
aircraft
Other Commitments [Line Items]      
Aircrafts to be purchased     632
MAX aircrafts to be delivered this year     114
Cash Capital Commitments, Boeing Orders      
Other Commitments [Line Items]      
Remainder of 2022 | $     $ 2,400
2023 | $     2,200
2024 | $     910
2025 | $     845
2026 | $     984
2027 | $     1,000
Thereafter | $     6,300
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 | $     $ 88
-8 Firm Orders      
Other Commitments [Line Items]      
Exercised, 2022     20
Exercised, 2023     3
Shifted, 2023     17
Aircrafts to be purchased     225
Estimated MAX aircrafts to be delivered this year     66
-7 Firm Orders      
Other Commitments [Line Items]      
Exercised, 2023     4
Aircrafts to be purchased     240
Estimated MAX aircrafts to be delivered this year     0
-7 Firm Orders | Subsequent Event      
Other Commitments [Line Items]      
Converted, 2022   48  
Love Field Airport Modernization Corporation | Series 2010 Bonds      
Other Commitments [Line Items]      
Cash payment | $ $ 310