SCHEDULE IV - CONSOLIDATED REINSURANCE (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Consolidated reinsurance, net [Abstract]
Premiums Earned, Net, Total		$ 5,513	$ 4,601	$ 3,256
Reinsurance Related [Member]
Consolidated reinsurance, net [Abstract]
Gross Amount		13,498	12,041	10,269
Ceded to Other Companies		1,579	1,543	1,485
Assumed from Other Companies		91	89	91
Premiums Earned, Net, Total		12,010	10,587	8,875
Gross Amount, Life Insurance in Force	[1]	1,524,977	1,420,500	1,075,600
Ceded to Other Companies, Life Insurance in Force	[1]	628,654	667,900	286,600
Assumed from Other Companies, Life Insurance in Force	[1]	7,611	8,700	9,500
Premiums, Net, Life Insurance in Force, Total	[1]	$ 903,934	$ 761,300	$ 798,500
Percentage of Amount Assumed to Net, Life Insurance in Force	[1]	0.80%	1.10%	1.20%
Life Insurance And Annuity Reserves And Claims Due [Member] | Reinsurance Related [Member]
Consolidated reinsurance, net [Abstract]
Gross Amount	[2]	$ 10,725	$ 9,742	$ 8,949
Ceded to Other Companies	[2]	1,545	1,509	1,465
Assumed from Other Companies	[2]	82	81	80
Premiums Earned, Net, Total	[2]	$ 9,262	$ 8,314	$ 7,564
Percentage of Amount Assumed to Net	[2]	0.90%	1.00%	1.10%
Accident And Health Life Insurance Reserves [Member] | Reinsurance Related [Member]
Consolidated reinsurance, net [Abstract]
Gross Amount		$ 2,773	$ 2,299	$ 1,320
Ceded to Other Companies		34	34	20
Assumed from Other Companies		9	8	11
Premiums Earned, Net, Total		$ 2,748	$ 2,273	$ 1,311
Percentage of Amount Assumed to Net		0.30%	0.40%	0.80%

[1] Includes Group Protection segment and Other Operations in-force amounts.

[2] Includes insurance fees on universal life and other interest-sensitive products