Schedule IV - Reinsurance (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Reinsurance Premiums for Insurance Companies, by Product Segment, Net Amount [Abstract]
Gross amount	$ 28,944	$ 26,188	$ 19,219
Ceded to other companies	544	469	447
Assumed from other companies	576	468	194
Net amount	28,976	26,187	18,966
Percentage of amount assumed to net	2.00%	1.80%	1.00%
Life insurance in force [Member]
Reinsurance Premiums for Insurance Companies, by Product Segment, Net Amount [Abstract]
Gross amount	781,053	710,140	606,587
Ceded to other companies	59,003	48,702	48,078
Assumed from other companies	3,459	4,435	9,163
Net amount	725,509	665,873	567,672
Percentage of amount assumed to net	0.50%	0.70%	1.60%
Life insurance and annuities [Member]
Reinsurance Premiums for Insurance Companies, by Product Segment, Net Amount [Abstract]
Gross amount	2,154	2,025	1,990
Ceded to other companies	279	268	280
Assumed from other companies	28	29	40
Net amount	1,903	1,786	1,750
Percentage of amount assumed to net	1.50%	1.60%	2.30%
Accident and health insurance [Member]
Reinsurance Premiums for Insurance Companies, by Product Segment, Net Amount [Abstract]
Gross amount	26,790	24,163	17,229
Ceded to other companies	265	201	167
Assumed from other companies	548	439	154
Net amount	$ 27,073	$ 24,401	$ 17,216
Percentage of amount assumed to net	2.00%	1.80%	0.90%