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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, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Earnings from Continuing Operations | $ 5 | $ 2 | $ 7 | $ 4
Reclassification out of Accumulated Other Comprehensive Income |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Settlement charge | 5 | 0 | 5 | 0
Amortization of Actuarial loss | 0 | 0 | 0 | 1
Tax effect | (1) | 0 | (2) | (2)
Earnings from Continuing Operations | 5 | 2 | 7 | 4
Reclassification out of Accumulated Other Comprehensive Income | Other Nonoperating Income, Net |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Amortization of prior service cost | 1 | 2 | 4 | 5
Total reclassifications out of accumulated other comprehensive loss before taxes | $ 6 | $ 2 | $ 9 | $ 6

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