Financial instruments and management of financial risks - Credit risk (Details) - USD ($) $ in Millions |
Dec. 31, 2022 |
Dec. 31, 2021 |
|---|---|---|
| Credit risk | ||
| Maximum exposure (excluding income tax effects) to credit risk | $ 666 | $ 585 |
| Cash and cash equivalents | ||
| Credit risk | ||
| Maximum exposure (excluding income tax effects) to credit risk | 125 | 115 |
| Accounts receivable | ||
| Credit risk | ||
| Maximum exposure (excluding income tax effects) to credit risk | 428 | 414 |
| Due from affiliated companies | ||
| Credit risk | ||
| Maximum exposure (excluding income tax effects) to credit risk | 81 | 53 |
| Derivative assets | ||
| Credit risk | ||
| Maximum exposure (excluding income tax effects) to credit risk | $ 32 | $ 3 |