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Pension plans - Schedule of information for plans with PBOs and ABOs in excess of plan assets (Detail) - Pension Plans, Defined Benefit [Member] - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Defined Benefit Plan Disclosure [Line Items] |  |
PBOs | $ 5,679 | $ 6,422
Plan assets | 4,469 | 4,766
ABOs | 1,246 | 5,594
Plan assets | $ 222 | $ 4,234

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