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Employee Benefits - Postretirement Benefits Other Than Pension Expenses (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Net periodic benefit (income) cost | $ (1) | $ (6) | $ (4) | $ (16)
Defined Contribution and Other Retirement Plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Interest cost on projected benefit obligation | 1 | 0 | 2 | 2
Net amortization and deferrals | (1) | (1) | (2) | (4)
Net periodic benefit (income) cost | $ 0 | $ (1) | $ 0 | $ (2)

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