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Investments - Summary of Amounts Included in Net Realized (Losses) Gains and Other-Than-Temporary Impairments (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Investment [Line Items]      
Gross realized gains on securities $ 14 $ 38 $ 64
Gross realized losses on securities (2) (12) (5)
Foreign exchange (losses) gains (7) (1) 12
Debt Securities, Available-for-sale, Allowance for Credit Loss, Not to Sell before Recovery, Credit Loss, Previously Recorded, Expense (Reversal) 0 0 0
Debt Securities, Available-for-sale, Allowance for Credit Loss, Sell before Recovery 0 0 0
Net realized (losses) gains 7 22 81
Gain (Loss) on Investments [Member]      
Investment [Line Items]      
Foreign exchange (losses) gains $ (5) $ (4) $ 22