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Components of Income Tax Provision (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Taxes [Abstract]      
Current federal income taxes $ 4 $ 6 $ 11
Deferred federal income taxes 230 111 (14)
Total federal income taxes 234 117 (3)
Current state income taxes 2 2 1
Deferred state income taxes 2 5 0
Total state income taxes 4 7 1
Current foreign income taxes (4) 48 30
Deferred foreign income taxes 36 23 42
Total foreign income taxes 32 71 72
Total provision for income taxes $ 270 $ 195 $ 70