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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, 2020
Dec. 31, 2019
Dec. 31, 2018
Gain (Loss) on Securities [Line Items]      
Other-than-temporary impairment (OTTI) losses gross   $ (90) $ (52)
OTTI on Fixed Maturities   (58) (49)
Debt Securities, Available-for-sale, Allowance for Credit Loss, Period Increase (Decrease) $ 188    
Debt Securities, Available-For-Sale, Credit Impairment Charges Intent to Sell (170) 0 0
Foreign exchange gains( losses) (483) 7 131
Fair Value adjustment on insurance derivative (202) (4) (248)
Derivative, Gain (Loss) on Derivative, Net (228) (585) (330)
Realized Investment Gains (Losses) (498) (530) (652)
Unrealized Gain (Loss) on Investments 2,130 3,088 (1,699)
Other Comprehensive Income (Loss), Securities, Available-for-sale, Tax (462) (647) 297
Other derivative instruments      
Gain (Loss) on Securities [Line Items]      
Derivative, Gain (Loss) on Derivative, Net 1 (8) (3)
Investment and embedded derivative instruments      
Gain (Loss) on Securities [Line Items]      
Derivative, Gain (Loss) on Derivative, Net 81 (435) (75)
S&P Options and Futures      
Gain (Loss) on Securities [Line Items]      
Derivative, Gain (Loss) on Derivative, Net (108) (138) (4)
Equity Securities [Member]      
Gain (Loss) on Securities [Line Items]      
Equity Securities, FV-NI, Realized Gain (Loss) 586 104 (59) [1]
Fixed maturities held to maturity      
Gain (Loss) on Securities [Line Items]      
Unrealized Gain (Loss) on Investments (24) (31) (38)
Other Investments [Member]      
Gain (Loss) on Securities [Line Items]      
Realized Investment Gains (Losses) (32) (20) (5)
Available-for-sale Securities [Member]      
Gain (Loss) on Securities [Line Items]      
Unrealized Gain (Loss) on Investments 2,628 3,769 (1,958)
Debt Securities [Member]      
Gain (Loss) on Securities [Line Items]      
Other-than-temporary impairment (OTTI) losses gross   (90) (52)
OTTI on fixed maturities recognized in OCI (pre-tax) 0 32 3
OTTI on Fixed Maturities   (58) (49)
Fixed Maturities [Member]      
Gain (Loss) on Securities [Line Items]      
Debt Securities, Available-for-sale, Realized Gain (Loss), Excluding Other-than-temporary Impairment 244 203 334
Debt Securities, Available-for-sale, Realized Loss, Excluding Other-than-temporary Impairment (366) (176) (587)
Debt Securities, Available-for-sale, Realized Gain (Loss) (281) (31) (302)
Other [Member]      
Gain (Loss) on Securities [Line Items]      
Gain (Loss) on Sale of Other Investments (60) (5) (87)
Unrealized Gain (Loss) on Investments (12) (3) 0
Accounting Standards Update 2016-01 [Member] | Equity Securities [Member]      
Gain (Loss) on Securities [Line Items]      
Equity Securities, FV-NI, Realized Gain (Loss) 586 104 (59)
Unrealized Gain (Loss) on Investments 131 46 (129)
Gain (Loss) on Sale of Investments 455 58 70
Accounting Standards Update 2016-01 [Member] | Other Investments [Member]      
Gain (Loss) on Securities [Line Items]      
Realized Investment Gains (Losses) (32) (20) (5)
Unrealized Gain (Loss) on Investments (32) (15) (126)
Gain (Loss) on Sale of Investments 0 (5) 121
Accounting Standards Update 2016-01 [Member] | Equity securities and other investments [Member]      
Gain (Loss) on Securities [Line Items]      
Realized Investment Gains (Losses) 554 84 (64)
Unrealized Gain (Loss) on Investments 99 31 (255)
Gain (Loss) on Sale of Investments 455 53 191
Accounting Standards Update 2016-13 [Member]      
Gain (Loss) on Securities [Line Items]      
Debt Securities, Available-for-sale, Allowance for Credit Loss, Period Increase (Decrease) $ 11 $ 0 $ 0
[1] Relates to certain securities we intended to sell and securities written to market entering default.