Schedule IV (SUPPLEMENTAL INFORMATION CONCERNING REINSURANCE) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024		Dec. 31, 2023	Dec. 31, 2022
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
SEC Schedule, 12-17, Insurance Companies, Reinsurance, Life Insurance in Force, Gross	$ 240,794	[1]	$ 248,973	$ 215,759
SEC Schedule, 12-17, Insurance Companies, Reinsurance, Life Insurance in Force, Ceded	43,626		55,665	50,105
SEC Schedule, 12-17, Insurance Companies, Reinsurance, Life Insurance in Force, Assumed	4,109		5,408	7,242
SEC Schedule, 12-17, Insurance Companies, Reinsurance, Life Insurance in Force, Net	$ 201,277		$ 198,716	$ 172,896
In Force Percentage of Amount	2.00%		3.00%	4.00%
Direct Amount	$ 55,148		$ 51,582	$ 46,160
Ceded To Other Companies	10,272		10,159	10,195
Assumed From Other Companies	4,970		4,289	4,395
Net Amount	$ 49,846		$ 45,712	$ 40,360
Percentage of Amount Assumed to Net	10.00%		9.00%	11.00%
Property and Casualty [Member]
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Direct Amount	$ 45,179		$ 42,598	$ 39,449
Ceded To Other Companies	9,702		9,549	9,678
Assumed From Other Companies	4,832		4,129	4,242
Net Amount	$ 40,309		$ 37,178	$ 34,013
Percentage of Amount Assumed to Net	12.00%		11.00%	12.00%
Accident and Health [Member]
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Direct Amount	$ 6,874		$ 6,580	$ 5,206
Ceded To Other Companies	473		446	411
Assumed From Other Companies	87		99	97
Net Amount	$ 6,488		$ 6,233	$ 4,892
Percentage of Amount Assumed to Net	1.00%		2.00%	2.00%
Life [Member]
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Direct Amount	$ 3,095		$ 2,404	$ 1,505
Ceded To Other Companies	97		164	106
Assumed From Other Companies	51		61	56
Net Amount	$ 3,049		$ 2,301	$ 1,455
Percentage of Amount Assumed to Net	2.00%		3.00%	4.00%

[1] The reduction in direct amount of life insurance face amount in force in 2024 versus 2023 reflects the non-renewal of certain credit-life business.