SCHEDULE IV REINSURANCE Schedule IV - Reinsurance (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Gross Amount, Life Insurance in Force	$ 132,880	$ 134,577	$ 148,801
Ceded to Other Companies, Life Insurance in Force	11,755	7,199	7,016
Assumed from Other Companies, Life Insurance in Force	34,599	22,568	20,662
Net Amount, Life Insurance in Force	$ 155,724	$ 149,946	$ 162,447
Percentage of Amount Assumed to Net, Life Insurance in Force	22.00%	15.00%	13.00%
Gross amount	$ 15,387	$ 17,857	$ 18,955
Ceded to Other Companies	419	504	553
Assumed from Other companies	295	294	220
Net Amount	$ 15,263	$ 17,647	$ 18,622
Percentage of Amount Assumed to Net	2.00%	2.00%	1.00%
Health insurance
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Gross amount	$ 13,058	$ 14,913	$ 15,682
Ceded to Other Companies	384	475	526
Assumed from Other companies	235	253	213
Net Amount	$ 12,909	$ 14,691	$ 15,369
Percentage of Amount Assumed to Net	2.00%	2.00%	1.00%
Life insurance
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Gross amount	$ 2,329	$ 2,944	$ 3,273
Ceded to Other Companies	35	29	27
Assumed from Other companies	60	41	7
Net Amount	$ 2,354	$ 2,956	$ 3,253
Percentage of Amount Assumed to Net	3.00%	1.00%	0.00%