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Pension plans - Defined benefit pension plans - Narrative (Detail) - Pension Plans, Defined Benefit [Member] - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Projected benefit obligation | $ 12,767 | $ 12,738 | $ 18,792
Amounts recognized in the Consolidated Balance Sheets: |  |  |
Funded status reflected in assets | 1,823 | 1,510 |
Funded status reflected in liabilities | 1,211 | 1,656 |
ABO | 12,300 | 12,200 |
Defined Benefit Plan, Expected Future Benefit Payment [Abstract] |  |  |
2024 | 895 |  |
2025 | 886 |  |
2026 | 885 |  |
2027 | 896 |  |
2028 | 885 |  |
2029 - 2033 | 4,434 |  |
Expected contribution to pension plans during the next year | 118 |  |
Unfunded Plans [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Projected benefit obligation | $ 1,000 | $ 1,100 |

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