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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 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2018
Investment [Line Items]          
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held   $ 12   $ 12 $ 12
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Reductions, Securities Sold       (1)  
Gross realized gains on securities $ 20 10 $ 27 34  
Gross realized losses on securities (11) 0 (11) (4)  
Foreign exchange (losses) gains     3 13  
Debt Securities, Available-for-sale, Allowance for Credit Loss, Not to Sell before Recovery, Credit Loss, Previously Recorded, Expense (Reversal) 0 0 0 0  
Debt Securities, Available-for-sale, Allowance for Credit Loss, Sell before Recovery 0 0 0 0  
Net realized (losses) gains 10 36 18 53  
Gain (Loss) on Investments [Member]          
Investment [Line Items]          
Foreign exchange (losses) gains $ 1 $ 26 $ 3 $ 23