Commitments and contingencies (Details) - USD ($) $ in Billions |
6 Months Ended | 12 Months Ended | |
|---|---|---|---|
Jun. 30, 2025 |
Jun. 30, 2024 |
Dec. 31, 2024 |
|
| Letter of credit | |||
| Other Commitments [Line Items] | |||
| Debt instrument, term | 1 year | 1 year | 1 year |
| Financial guarantee | |||
| Other Commitments [Line Items] | |||
| Guarantor obligations, current carrying value | $ 14.9 | $ 12.8 | $ 13.1 |
| Financial standby letter of credit | |||
| Other Commitments [Line Items] | |||
| Guarantor obligations, current carrying value | $ 0.5 | $ 0.4 | $ 0.4 |