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Significant Accounting Policies - Reclassifications Out of Accumulated Other Comprehensive Loss (Detail) - Pension and Postretirement Benefit Plans - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Amounts reclassified from accumulated other comprehensive loss, net of tax | $ 2 | $ 1 | $ 4 | $ 3
Reclassification out of Accumulated Other Comprehensive Income |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Amortization of prior service cost | 2 | 1 | 5 | 4
Amortization of Actuarial loss | 0 | 0 | 1 | 0
Tax effect | 0 | 0 | (2) | (1)
Amounts reclassified from accumulated other comprehensive loss, net of tax | 2 | 1 | 4 | 3
Reclassification out of Accumulated Other Comprehensive Income | Other Nonoperating Income, Net |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Total reclassifications out of accumulated other comprehensive loss before taxes | $ 2 | $ 1 | $ 6 | $ 4

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