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Derivative contract (Detail) - Not Designated as Hedging Instrument [Member] - Equity Index Put Options [Member] - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Derivative [Line Items]    
Balance sheet liabilities - at fair value $ 99 $ 1,065
Notional value $ 6,992 10,991
Intrinsic value   $ 727
Weighted average remaining life (in years) 6 months 1 year 2 months 12 days