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Income Taxes (Income Taxes and Shareholders' Equity) (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Current taxes:      
Federal $ 0 $ 0 $ 0
State 0 0 0
Foreign 0 0 1
Deferred taxes:      
Federal 0 0 0
Foreign 0 0 0
Income Tax Expense (Benefit), Total $ 0 $ 0 $ 1