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Investments (Net Realized Gains (Losses) And Losses Included In Net Realized Gains (Losses) And Other Comprehensive Income) (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Gain (Loss) on Securities [Line Items]      
Other-than-temporary impairment (OTTI) losses gross     $ (90)
OTTI on Fixed Maturities     (58)
Debt Securities, Available-for-sale, Allowance for Credit Loss, Period Increase (Decrease) $ 14 $ 188  
Debt Securities, Available-For-Sale, Credit Impairment Charges Intent to Sell (30) (170) 0
Foreign exchange gains( losses) 348 (483) 7
Fair Value adjustment on insurance derivative 316 (202) (4)
Derivative, Gain (Loss) on Derivative, Net 34 (228) (585)
Net realized gains (losses) (includes $3, $(281), and $(31) reclassified from AOCI) 1,152 (498) (530)
Unrealized Gain (Loss) on Investments (2,417) 2,130 3,088
Other Comprehensive Income (Loss), Securities, Available-for-sale, Tax 521 (462) (647)
Other derivative instruments      
Gain (Loss) on Securities [Line Items]      
Derivative, Gain (Loss) on Derivative, Net (8) 1 (8)
Investment and embedded derivative instruments      
Gain (Loss) on Securities [Line Items]      
Derivative, Gain (Loss) on Derivative, Net (72) 81 (435)
S&P Options and Futures      
Gain (Loss) on Securities [Line Items]      
Derivative, Gain (Loss) on Derivative, Net (202) (108) (138)
Equity Securities [Member]      
Gain (Loss) on Securities [Line Items]      
Equity Securities, FV-NI, Realized Gain (Loss) 662 586 104 [1]
Fixed maturities held to maturity      
Gain (Loss) on Securities [Line Items]      
Unrealized Gain (Loss) on Investments (18) (24) (31)
Other Investments [Member]      
Gain (Loss) on Securities [Line Items]      
Net realized gains (losses) (includes $3, $(281), and $(31) reclassified from AOCI) 111 (32) (20)
Available-for-sale Securities [Member]      
Gain (Loss) on Securities [Line Items]      
Unrealized Gain (Loss) on Investments (2,901) 2,628 3,769
Debt Securities [Member]      
Gain (Loss) on Securities [Line Items]      
Other-than-temporary impairment (OTTI) losses gross     (90)
OTTI on fixed maturities recognized in OCI (pre-tax) 0 0 32
OTTI on Fixed Maturities     (58)
Fixed Maturities [Member]      
Gain (Loss) on Securities [Line Items]      
Debt Securities, Available-for-sale, Realized Gain (Loss), Excluding Other-than-temporary Impairment 142 244 203
Debt Securities, Available-for-sale, Realized Loss, Excluding Other-than-temporary Impairment (123) (366) (176)
Debt Securities, Available-for-sale, Realized Gain (Loss) 3 (281) (31)
Other [Member]      
Gain (Loss) on Securities [Line Items]      
Gain (Loss) on Sale of Other Investments (6) (60) (5)
Unrealized Gain (Loss) on Investments (19) (12) (3)
Accounting Standards Update 2016-01 [Member] | Equity Securities [Member]      
Gain (Loss) on Securities [Line Items]      
Equity Securities, FV-NI, Realized Gain (Loss) 662 586 104
Unrealized Gain (Loss) on Investments 505 131 46
Gain (Loss) on Sale of Investments 157 455 58
Accounting Standards Update 2016-01 [Member] | Other Investments [Member]      
Gain (Loss) on Securities [Line Items]      
Net realized gains (losses) (includes $3, $(281), and $(31) reclassified from AOCI) 111 (32) (20)
Unrealized Gain (Loss) on Investments 111 (32) (15)
Gain (Loss) on Sale of Investments 0 0 (5)
Accounting Standards Update 2016-01 [Member] | Equity securities and other investments [Member]      
Gain (Loss) on Securities [Line Items]      
Net realized gains (losses) (includes $3, $(281), and $(31) reclassified from AOCI) 773 554 84
Unrealized Gain (Loss) on Investments 616 99 31
Gain (Loss) on Sale of Investments 157 455 53
-72000000      
Gain (Loss) on Securities [Line Items]      
Debt Securities, Available-for-sale, Allowance for Credit Loss, Period Increase (Decrease) $ 14 $ 11 $ 0
[1] Relates to certain securities we intended to sell and securities written to market entering default.