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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Earnings from Continuing Operations | $ 1 | $ 1 | $ 2 | $ 2
Reclassification out of Accumulated Other Comprehensive Income |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Tax effect | 0 | (1) | (1) | (1)
Earnings from Continuing Operations | 1 | 1 | 2 | 2
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 | $ 3 | $ 3

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