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Income Taxes - Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Income Tax Disclosure [Abstract]      
Unrecognized tax benefit at beginning of year $ 57 $ 38 $ 98
Gross increase for tax positions in prior years 8 25 10
Gross decrease for tax positions in prior years (1) (2) (60)
Cash Settlements (1) (1) (3)
Lapse of statute of limitations (3) (3) (7)
Unrecognized tax benefit at end of year $ 60 $ 57 $ 38