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Employee Benefits - Components of Net Periodic Benefit Cost and Changes in Plan Assets and Benefit Obligations Recognized in OCI (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net periodic benefit (income) cost | $ 125 | $ (28) | $ (19)
Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Service cost for benefits earned | 0 | 0 | 1
Interest cost on projected benefit obligation | 3 | 3 | 1
Net amortization and deferrals | (2) | (6) | (5)
Net periodic benefit (income) cost | 1 | (3) | $ (3)
Net actuarial loss (gain) | 4 | 3 |
Recognized actuarial (loss) gain | (1) | 0 |
Recognized prior service credit | 2 | 5 |
Total loss (gain) recognized in OCI (before tax effects) | $ 5 | $ 8 |

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