Schedule IV - Reinsurance (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Life insurance in force
Gross amount, Life insurance in force	$ 1,047,982	$ 879,508	$ 781,053
Ceded to other companies, Life insurance in force	72,208	58,133	59,003
Assumed from other companies, Life insurance in force	3,273	3,180	3,459
Net amount, Life Insurance In Force	979,047	824,555	725,509
Premiums:
Gross amount, premiums	29,812	27,215	25,541
Ceded to other companies, premiums	570	603	543
Assumed from other companies, premiums	400	602	577
Net amount	$ 29,642	$ 27,214	$ 25,575
Percentage of amount assumed to net, premiums	1.30%	2.20%	2.30%
Percentage of amount assumed to net, Life insurance in force	0.30%	0.40%	0.50%
Life insurance and annuities [Member]
Premiums:
Gross amount, premiums	$ 2,886	$ 2,302	$ 2,140
Ceded to other companies, premiums	335	320	279
Assumed from other companies, premiums	106	32	28
Net amount	$ 2,657	$ 2,014	$ 1,889
Percentage of amount assumed to net, premiums	4.00%	1.60%	1.50%
Accident and health insurance [Member]
Premiums:
Gross amount, premiums	$ 26,926	$ 24,913	$ 23,401
Ceded to other companies, premiums	235	283	264
Assumed from other companies, premiums	294	570	549
Net amount	$ 26,985	$ 25,200	$ 23,686
Percentage of amount assumed to net, premiums	1.10%	2.30%	2.30%