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		$ 4,362	$ 3,018	$ 2,579
Embedded derivatives - Reinsurance related [Member]
Consolidated reinsurance, net [Abstract]
Gross Amount		11,882	10,103	9,373
Ceded to Other Companies		1,883	1,817	1,728
Assumed from Other Companies		96	101	105
Premiums Earned, Net, Total		10,095	8,387	7,750
Gross Amount, Life Insurance in Force	[1]	1,366,563	1,014,841	969,563
Ceded to Other Companies, Life Insurance in Force	[1]	627,868	240,034	237,520
Assumed from Other Companies, Life Insurance in Force	[1]	12,295	13,476	14,522
Premiums, Net, Life Insurance in Force, Total	[1]	$ 750,990	$ 788,283	$ 746,565
Percentage of Amount Assumed to Net, Life Insurance in Force	[1]	1.60%	1.70%	1.90%
Life Insurance And Annuity Reserves And Claims Due [Member] | Embedded derivatives - Reinsurance related [Member]
Consolidated reinsurance, net [Abstract]
Gross Amount	[2]	$ 9,583	$ 8,783	$ 8,098
Ceded to Other Companies	[2]	1,841	1,786	1,695
Assumed from Other Companies	[2]	88	90	93
Premiums Earned, Net, Total	[2]	$ 7,830	$ 7,087	$ 6,496
Percentage of Amount Assumed to Net	[2]	1.10%	1.30%	1.40%
Accident And Health Life Insurance Reserves [Member] | Embedded derivatives - Reinsurance related [Member]
Consolidated reinsurance, net [Abstract]
Gross Amount		$ 2,299	$ 1,320	$ 1,275
Ceded to Other Companies		42	31	33
Assumed from Other Companies		8	11	12
Premiums Earned, Net, Total		$ 2,265	$ 1,300	$ 1,254
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.