SCHEDULE IV - CONSOLIDATED REINSURANCE (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Consolidated reinsurance, net [Abstract]
Premiums Earned, Net, Total		$ 4,601	$ 3,256	$ 2,987
Embedded derivatives-Reinsurance related [Member]
Consolidated reinsurance, net [Abstract]
Gross Amount		12,041	10,269	9,551
Ceded to Other Companies		1,543	1,485	1,413
Assumed from Other Companies		89	91	93
Premiums Earned, Net, Total		10,587	8,875	8,231
Gross Amount, Life Insurance in Force	[1]	1,420,500	1,075,600	1,035,600
Ceded to Other Companies, Life Insurance in Force	[1]	667,900	286,600	288,000
Assumed from Other Companies, Life Insurance in Force	[1]	8,700	9,500	10,200
Premiums, Net, Life Insurance in Force, Total	[1]	$ 761,300	$ 798,500	$ 757,800
Percentage of Amount Assumed to Net, Life Insurance in Force	[1]	1.10%	1.20%	1.30%
Life Insurance And Annuity Reserves And Claims Due [Member] | Embedded derivatives-Reinsurance related [Member]
Consolidated reinsurance, net [Abstract]
Gross Amount	[2]	$ 9,742	$ 8,949	$ 8,277
Ceded to Other Companies	[2]	1,509	1,465	1,392
Assumed from Other Companies	[2]	81	80	80
Premiums Earned, Net, Total	[2]	$ 8,314	$ 7,564	$ 6,965
Percentage of Amount Assumed to Net	[2]	1.00%	1.10%	1.10%
Accident And Health Life Insurance Reserves [Member] | Embedded derivatives-Reinsurance related [Member]
Consolidated reinsurance, net [Abstract]
Gross Amount		$ 2,299	$ 1,320	$ 1,274
Ceded to Other Companies		34	20	21
Assumed from Other Companies		8	11	13
Premiums Earned, Net, Total		$ 2,273	$ 1,311	$ 1,266
Percentage of Amount Assumed to Net		0.40%	0.80%	1.00%

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

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