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Business Developments and Risks and Uncertainties (Schedule of Results of Operations from Discontinued Operation) (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Revenues      
Revenues $ 59 $ 116 $ 58
Cost of sales 28 58 29
Total revenues from discontinued operations 31 58 29
Expenses:      
Operating 31 67 28
Interest 3 4 1
Increase (decrease) on loss on disposal group 0 (10) 54
Total expenses from discontinued operations 34 61 83
Income (loss) before income taxes from discontinued operations (3) (3) (54)
Provision (benefit) for income taxes from discontinued operations 0 0 0
Income (loss) from discontinued operations, net of income taxes $ (3) $ (3) $ (54)