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Income Taxes (Income before Income Taxes) (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Income (loss) from continuing operations before income taxes | $ (441) | $ (484) | $ (148)
Domestic [Member] |  |  |
Income (loss) from continuing operations before income taxes | (441) | (484) | (148)
Foreign [Member] |  |  |
Income (loss) from continuing operations before income taxes | $ 0 | $ 0 | $ 0

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