SCHEDULE IV REINSURANCE Schedule IV - Reinsurance (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Gross Amount, Life Insurance in Force	$ 134,577	$ 148,801	$ 146,585
Ceded to Other Companies, Life Insurance in Force	7,199	7,016	6,592
Assumed from Other Companies, Life Insurance in Force	22,568	20,662	0
Net Amount, Life Insurance in Force	$ 149,946	$ 162,447	$ 139,993
Percentage of Amount Assumed to Net, Life Insurance in Force	15.00%	13.00%	0.00%
Gross amount	$ 17,857	$ 18,955	$ 19,122
Ceded to Other Companies	504	553	547
Assumed from Other companies	294	220	205
Net Amount	$ 17,647	$ 18,622	$ 18,780
Percentage of Amount Assumed to Net	2.00%	1.00%	1.00%
Health insurance
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Gross amount	$ 14,913	$ 15,682	$ 15,657
Ceded to Other Companies	475	526	527
Assumed from Other companies	253	213	205
Net Amount	$ 14,691	$ 15,369	$ 15,335
Percentage of Amount Assumed to Net	2.00%	1.00%	1.00%
Life insurance
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Gross amount	$ 2,944	$ 3,273	$ 3,465
Ceded to Other Companies	29	27	20
Assumed from Other companies	41	7	0
Net Amount	$ 2,956	$ 3,253	$ 3,445
Percentage of Amount Assumed to Net	1.00%	0.00%	0.00%