Commitments and contingencies - Narrative (Details) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2023 USD ($) aircraft	Jun. 30, 2023 USD ($) aircraft
Aircraft
Other Commitments [Line Items]
Remainder of 2023 | $	$ 1,200	$ 1,200
2024 | $	2,100	2,100
2025 | $	992	992
2026 | $	1,400	1,400
2027 | $	1,100	1,100
2028 | $	1,300	1,300
Thereafter | $	$ 4,300	$ 4,300
-7 Firm Orders
Other Commitments [Line Items]
Exercised | aircraft	30
-7 Firm Orders | 2022 Contractual Deliveries
Other Commitments [Line Items]
Number of aircrafts to be delivered | aircraft	14	14
-8 Firm Orders
Other Commitments [Line Items]
Exercised | aircraft	24
MAX aircrafts to be delivered this year | aircraft	70	70
-8 Firm Orders | 2022 Contractual Deliveries
Other Commitments [Line Items]
Number of aircrafts to be delivered | aircraft	32	32
B737-7Max
Other Commitments [Line Items]
MAX aircrafts to be delivered this year | aircraft	26	26
-7 or -8 Options | 2022 Contractual Deliveries
Other Commitments [Line Items]
Number of aircrafts to be delivered | aircraft	46	46
B737-8Max And B737-7Max | Aircraft
Other Commitments [Line Items]
Remainder of 2023 | $	$ 956	$ 956
Long-term purchase commitment | aircraft		46