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]
Gross Amount	$ 568,120	$ 597,694	$ 629,367
Ceded	175,728	191,083	206,304
Assumed	7,153	7,458	6,879
Net Amount	$ 399,545	$ 414,069	$ 429,942
% Amount Assumed to Net	1.80%	1.80%	1.60%
Consolidated Reinsurance
Gross Amount	$ 1,651	$ 1,699	$ 1,795
Ceded	779	810	943
Assumed	10	11	11
Net premiums	$ 882	$ 900	$ 863
% Amount Assumed to Net	1.10%	1.20%	1.30%
Life insurance (1)
Consolidated Reinsurance
Gross Amount	$ 1,424	$ 1,468	$ 1,557
Ceded	556	580	711
Assumed	10	11	11
Net premiums	$ 878	$ 899	$ 857
% Amount Assumed to Net	1.10%	1.20%	1.30%
Accident and Health Insurance Product Line [Member]
Consolidated Reinsurance
Gross Amount	$ 227	$ 231	$ 238
Ceded	223	230	232
Assumed	0	0	0
Net premiums	$ 4	$ 1	$ 6
% Amount Assumed to Net	0.00%	0.00%	0.00%
Affiliated Entity
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Ceded			$ 17,100
Assumed			6,900
Affiliated Entity | Life insurance (1)
Consolidated Reinsurance
Ceded		$ 201	537
Assumed		$ 6	$ 11