Consolidated Reinsurance (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Consolidated Reinsurance
Gross Amount	$ 38,719	$ 37,185	$ 27,596
Ceded	2,232	2,308	1,902
Assumed	1,488	1,484	1,377
Net Amount	37,975	36,361	27,071
% Amount Assumed to Net	3.90%	4.10%	5.10%
Life Insurance in Force [Member]
Consolidated Reinsurance
Gross Amount	4,432,178	4,263,421	4,199,755
Ceded	761,993	754,781	742,194
Assumed	594,062	604,555	628,879
Net Amount	4,264,247	4,113,195	4,086,440
% Amount Assumed to Net	13.90%	14.70%	15.40%
Life Insurance [Member]
Consolidated Reinsurance
Gross Amount	22,006	21,930	17,300
Ceded	1,550	1,670	1,469
Assumed	1,268	1,198	1,183
Net Amount	21,724	21,458	17,014
% Amount Assumed to Net	5.80%	5.60%	7.00%
Accident and Health Insurance [Member]
Consolidated Reinsurance
Gross Amount	13,567	12,186	7,298
Ceded	605	568	364
Assumed	211	275	189
Net Amount	13,173	11,893	7,123
% Amount Assumed to Net	1.60%	2.30%	2.70%
Property and Casualty Insurance [Member]
Consolidated Reinsurance
Gross Amount	3,146	3,069	2,998
Ceded	77	70	69
Assumed	9	11	5
Net Amount	$ 3,078	$ 3,010	$ 2,934
% Amount Assumed to Net	0.30%	0.40%	0.20%