Reserve for Life-Contingent Contract Benefits and Contractholder Funds (Details 6) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Liabilities for guarantees:
Liability for guarantees	$ 555	$ 673	$ 644
Liability for guarantees related to income benefits
Liabilities for guarantees:
Liability for guarantees	113	235	191
Variable annuities | In the event of death
Liabilities for guarantees:
Liability for guarantees	98	112	116
Variable annuities | Liability for guarantees related to income benefits
Liabilities for guarantees:
Liability for guarantees	99	221	175
Variable annuities | Accumulation at specified dates
Liabilities for guarantees:
Liability for guarantees	43	86	105
Variable annuities | For cumulative periodic withdrawals
Liabilities for guarantees:
Liability for guarantees	13	39	57
Variable annuities | Other guarantees
Liabilities for guarantees:
Liability for guarantees	$ 302	$ 215	$ 191