Schedule IV (SUPPLEMENTAL INFORMATION CONCERNING REINSURANCE) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
SEC Schedule, 12-17, Insurance Companies, Reinsurance, Life Insurance in Force, Gross	$ 248,973	$ 215,759	$ 139,856
SEC Schedule, 12-17, Insurance Companies, Reinsurance, Life Insurance in Force, Ceded	55,665	50,105	34,545
SEC Schedule, 12-17, Insurance Companies, Reinsurance, Life Insurance in Force, Assumed	5,408	7,242	7,680
SEC Schedule, 12-17, Insurance Companies, Reinsurance, Life Insurance in Force, Net	$ 198,716	$ 172,896	$ 112,991
In Force Percentage of Amount	3.00%	4.00%	7.00%
Direct Amount	$ 51,582	$ 46,160	$ 41,116
Ceded To Other Companies	10,159	10,195	8,433
Assumed From Other Companies	4,289	4,395	3,609
Net Amount	$ 45,712	$ 40,360	$ 36,292
Percentage of Amount Assumed to Net	9.00%	11.00%	10.00%
Property and Casualty [Member]
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Direct Amount	$ 42,598	$ 39,449	$ 35,767
Ceded To Other Companies	9,549	9,678	7,982
Assumed From Other Companies	4,129	4,242	3,441
Net Amount	$ 37,178	$ 34,013	$ 31,226
Percentage of Amount Assumed to Net	11.00%	12.00%	11.00%
Accident and Health [Member]
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Direct Amount	$ 6,580	$ 5,206	$ 4,062
Ceded To Other Companies	446	411	362
Assumed From Other Companies	99	97	109
Net Amount	$ 6,233	$ 4,892	$ 3,809
Percentage of Amount Assumed to Net	2.00%	2.00%	3.00%
Life [Member]
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Direct Amount	$ 2,404	$ 1,505	$ 1,287
Ceded To Other Companies	164	106	89
Assumed From Other Companies	61	56	59
Net Amount	$ 2,301	$ 1,455	$ 1,257
Percentage of Amount Assumed to Net	3.00%	4.00%	5.00%