Goodwill and intangible assets - Narrative (Details) - USD ($) $ in Millions |
Dec. 31, 2025 |
Oct. 01, 2025 |
Dec. 31, 2024 |
Oct. 01, 2024 |
|---|---|---|---|---|
| Disclosure of information for cash-generating units [line items] | ||||
| Goodwill and intangible assets | $ 13,107 | $ 12,384 | ||
| Goodwill | ||||
| Disclosure of information for cash-generating units [line items] | ||||
| Goodwill and intangible assets | $ 4,419 | $ 1,800 | $ 4,118 | $ 1,500 |