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Investment and derivative contract gains/losses (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Investments Debt And Equity Securities [Abstract]    
Equity securities - Change in unrealized investment gains (losses) during the period on securities held at the end of the period $ 4,630 $ (68,482)
Equity securities - Investment gains (losses) on securities sold during the period 430 (410)
Equity securities - Investment gains (losses), total 5,060 (68,892)
Fixed maturity securities - Gross realized gains 20 16
Fixed maturity securities - Gross realized losses (1) (6)
Other 132  
Investment gains (losses) 5,211 (68,882)
Derivative contract gains (losses) 489 (1,393)
Investment and derivative contract gains (losses) $ 5,700 $ (70,275)