Reserve for Life-Contingent Contract Benefits and Contractholder Funds (Details 2) (USD $) In Millions, unless otherwise specified					12 Months Ended		12 Months Ended						12 Months Ended									12 Months Ended				12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2013 Interest-sensitive life insurance	Dec. 31, 2012 Interest-sensitive life insurance	Dec. 31, 2013 Equity-indexed life insurance Minimum	Dec. 31, 2013 Equity-indexed life insurance Maximum	Dec. 31, 2013 Other life insurance Minimum	Dec. 31, 2013 Other life insurance Maximum	Dec. 31, 2013 Fixed annuities	Dec. 31, 2012 Fixed annuities	Dec. 31, 2013 Fixed annuities Maximum	Dec. 31, 2013 Immediate fixed annuities Minimum	Dec. 31, 2013 Immediate fixed annuities Maximum	Dec. 31, 2013 Equity indexed fixed annuities Minimum	Dec. 31, 2013 Equity indexed fixed annuities Maximum	Dec. 31, 2013 Other fixed annuities Minimum	Dec. 31, 2013 Other fixed annuities Maximum	Dec. 31, 2013 Funding agreements backing medium-term notes	Dec. 31, 2012 Funding agreements backing medium-term notes	Dec. 31, 2013 Funding agreements backing medium-term notes Minimum	Dec. 31, 2013 Funding agreements backing medium-term notes Maximum	Dec. 31, 2013 Other investment contracts	Dec. 31, 2012 Other investment contracts	Dec. 31, 2013 Other investment contracts Minimum	Dec. 31, 2013 Other investment contracts Maximum
Contractholder funds
Total contractholder funds	$ 24,304	$ 39,319	$ 42,332	$ 48,195	$ 7,777	$ 11,011					$ 16,199	$ 25,881								$ 89	$ 1,867			$ 239	$ 560
Key contract provisions relating to contractholder funds:
Contractholder funds, interest rate assumptions (as a percent)							0.00%	10.00%	1.00%	6.00%				0.00%	9.80%	(8.00%)	13.50%	0.10%	6.00%			1.80%	5.40%			1.70%	10.30%
Period for withdrawal or surrender charges					20 years								10 years
Percent of fixed annuities subject to market value adjustment for discretionary withdrawals											25.80%