Consolidated Reinsurance (Consolidated Reinsurance) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Direct Premiums, Life Insurance in Force	$ 5,100,675	$ 4,963,820	$ 4,594,523
Ceded Premiums, Life Insurance in Force	488,958	507,589	513,091
Assumed Premiums, Life Insurance in Force	623,662	532,511	581,246
Premiums, Net, Life Insurance in Force	$ 5,235,379	$ 4,988,742	$ 4,662,678
Life Insurance in Force Premiums, Percentage Assumed to Net	11.90%	10.70%	12.50%
Consolidated Reinsurance
Gross Amount	$ 42,513	$ 44,199	$ 39,595
Ceded	2,298	2,380	2,376
Assumed	2,020	2,021	1,773
Premiums	$ 42,235	$ 43,840	$ 38,992
% Amount Assumed to Net	4.80%	4.60%	4.50%
Life insurance (1)
Consolidated Reinsurance
Gross Amount	$ 23,938	$ 26,356	$ 22,379
Ceded	1,704	1,792	1,863
Assumed	1,794	1,791	1,531
Premiums	$ 24,028	$ 26,355	$ 22,047
% Amount Assumed to Net	7.50%	6.80%	6.90%
Accident & health insurance
Consolidated Reinsurance
Gross Amount	$ 14,835	$ 14,166	$ 13,593
Ceded	523	515	442
Assumed	207	212	223
Premiums	$ 14,519	$ 13,863	$ 13,374
% Amount Assumed to Net	1.40%	1.50%	1.70%
Property and casualty insurance
Consolidated Reinsurance
Gross Amount	$ 3,740	$ 3,677	$ 3,623
Ceded	71	73	71
Assumed	19	18	19
Premiums	$ 3,688	$ 3,622	$ 3,571
% Amount Assumed to Net	0.50%	0.50%	0.50%