SCHEDULE IV REINSURANCE Schedule IV - Reinsurance (Detail) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2023		Dec. 31, 2022		Dec. 31, 2021
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Gross Amount, Life Insurance in Force	$ 163,601				$ 132,880				$ 163,601		$ 132,880		$ 134,577
Ceded to Other Companies, Life Insurance in Force	15,592				11,755				15,592		11,755		7,199
Assumed from Other Companies, Life Insurance in Force	28,716				34,599				28,716		34,599		22,568
Net Amount, Life Insurance in Force	$ 176,725				$ 155,724				$ 176,725		$ 155,724		$ 149,946
Percentage of Amount Assumed to Net, Life Insurance in Force	16.00%				22.00%				16.00%		22.00%		15.00%
Gross amount									$ 14,318		$ 15,025		$ 17,305
Ceded to Other Companies									404		419		504
Assumed from Other companies									209		295		294
Net Amount	$ 3,385	$ 3,476	$ 3,573	$ 3,688	$ 3,523	$ 3,535	$ 3,764	$ 4,079	$ 14,123	[1]	$ 14,901	[1]	$ 17,095	[1]
Percentage of Amount Assumed to Net									1.00%		2.00%		2.00%
Health insurance
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Gross amount									$ 12,335		$ 12,900		$ 14,689
Ceded to Other Companies									352		384		475
Assumed from Other companies									167		235		253
Net Amount									$ 12,150		$ 12,751		$ 14,467
Percentage of Amount Assumed to Net									1.00%		2.00%		2.00%
Life insurance
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Gross amount									$ 1,983		$ 2,125		$ 2,616
Ceded to Other Companies									52		35		29
Assumed from Other companies									42		60		41
Net Amount									$ 1,973		$ 2,150		$ 2,628
Percentage of Amount Assumed to Net									2.00%		3.00%		2.00%

[1] Includes a gain (loss) of $20, $(42) and $(11) in 2023, 2022 and 2021, respectively, related to remeasurement of the deferred profit liability for limited-payment contracts.