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Income taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
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Deferred tax assets: |  |  |  |
Company retirement benefit plans | $ 2 | $ 38 |  |
Revaluation of derivative financial instruments to fair value | 4 | 2 |  |
Tax losses, credits and interest deduction carryforwards | 1,149 | 1,052 |  |
Share-based compensation | 39 | 41 |  |
Accrued expenses | 454 | 420 |  |
Lease liabilities | 286 | 292 |  |
Total deferred tax assets | 1,934 | 1,845 |  |
Less: valuation allowances | (1,059) | (914) | $ (737) | $ (578)
Total deferred tax assets after valuation allowances | 875 | 931 |  |
Deferred tax liabilities: |  |  |  |
Investment in subsidiaries | 146 | 155 |  |
Depreciation, depletion and amortization | 3,419 | 3,109 |  |
Leased right-of-use assets | 278 | 274 |  |
Rolled-over capital gains | 21 | 21 |  |
Other | 15 | 12 |  |
Total deferred tax liabilities | 3,879 | 3,571 |  |
Total net deferred tax liabilities | $ 3,004 | $ 2,640 |  |

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