Summary of significant accounting policies - Disclosure of change in presentation of cash interest paid (Details) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2022 |
Dec. 31, 2021 |
Dec. 31, 2020 |
|
| Disclosure of detailed information about intangible assets [table] | |||
| Cash provided by operating activities | $ 437 | $ 311 | $ 297 |
| Less: Interest paid | 23 | 29 | 34 |
| Cash (used in) provided by financing activities, as previously reported | $ (300) | (235) | 1,657 |
| Beginning of year | |||
| Disclosure of detailed information about intangible assets [table] | |||
| Cash provided by operating activities | 282 | 263 | |
| Cash (used in) provided by financing activities, as previously reported | (206) | 1,691 | |
| Revision of Prior Period, Change in Accounting Principle, Adjustment | |||
| Disclosure of detailed information about intangible assets [table] | |||
| Add back: Interest paid | 29 | 34 | |
| Less: Interest paid | $ 29 | $ 34 | |