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Investments - Summary of Amounts Included in Net Realized (Losses) Gains and Other-Than-Temporary Impairments (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Investment [Line Items]    
Gross realized gains on securities $ 6 $ 24
Gross realized losses on securities 0 (4)
Foreign exchange (losses) gains 1 2
Debt Securities, Available-for-sale, Allowance for Credit Loss, Not to Sell before Recovery, Credit Loss, Previously Recorded, Expense (Reversal) 0 0
Debt Securities, Available-for-sale, Allowance for Credit Loss, Sell before Recovery 0 0
Net realized (losses) gains 8 17
Gain (Loss) on Investments [Member]    
Investment [Line Items]    
Foreign exchange (losses) gains $ 2 $ (3)