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Income Taxes - Income Tax Expense (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Current      
Federal $ (45) $ (3) $ (10)
State and local 1 0 6
Foreign 9 13 19
Deferred      
Federal 34 (10) (20)
State and local 6 (1) (4)
Foreign (158) 8 6
Total income tax (benefit) expense $ (153) $ 7 $ (3)
Effective income tax rate 637.50% (53.80%) (11.10%)