SCHEDULE IV REINSURANCE Schedule IV - Reinsurance (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Gross Amount, Life Insurance in Force		$ 187,553	$ 163,601	$ 132,880
Ceded to Other Companies, Life Insurance in Force		13,481	15,592	11,755
Assumed from Other Companies, Life Insurance in Force		21,192	28,716	34,599
Net Amount, Life Insurance in Force		$ 195,264	$ 176,725	$ 155,724
Percentage of Amount Assumed to Net, Life Insurance in Force		11.00%	16.00%	22.00%
Gross amount		$ 13,562	$ 14,318	$ 15,025
Ceded to Other Companies		284	404	419
Assumed from Other companies		162	209	295
Net Amount	[1]	$ 13,440	$ 14,123	$ 14,901
Percentage of Amount Assumed to Net		1.00%	1.00%	2.00%
Health insurance
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Gross amount		$ 11,784	$ 12,335	$ 12,900
Ceded to Other Companies		233	352	384
Assumed from Other companies		135	167	235
Net Amount		$ 11,686	$ 12,150	$ 12,751
Percentage of Amount Assumed to Net		1.00%	1.00%	2.00%
Life insurance
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Gross amount		$ 1,778	$ 1,983	$ 2,125
Ceded to Other Companies		51	52	35
Assumed from Other companies		27	42	60
Net Amount		$ 1,754	$ 1,973	$ 2,150
Percentage of Amount Assumed to Net		2.00%	2.00%	3.00%

[1] Includes a gain (loss) of $(81), $20 and $(42) in 2024, 2023 and 2022, respectively, related to remeasurement of the deferred profit liability for limited-payment contracts.