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Pension plans - Defined benefit pension plans - Narrative (Detail) - Pension Plans, Defined Benefit [Member] - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Projected benefit obligation | $ 11,720 | $ 12,767 | $ 12,738
Amounts recognized in the Consolidated Balance Sheets: |  |  |
ABO | 11,200 | 12,300 |
Defined Benefit Plan, Expected Future Benefit Payment [Abstract] |  |  |
2025 | 893 |  |
2026 | 873 |  |
2027 | 875 |  |
2028 | 884 |  |
2029 | 883 |  |
2030 - 2034 | 4,379 |  |
Expected contribution to pension plans during the next year | 114 |  |
Unfunded Plans [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Projected benefit obligation | $ 1,000 | $ 1,000 |

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