Variable Annuity and Insurance Guarantees (Details 3) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Mutual funds
Distribution of separate account balances by asset type for variable annuity contracts providing guaranteed benefits:
Separate account balance	$ 56,569	$ 56,837
Equity
Distribution of separate account balances by asset type for variable annuity contracts providing guaranteed benefits:
Separate account balance	30,738	32,310
Bond
Distribution of separate account balances by asset type for variable annuity contracts providing guaranteed benefits:
Separate account balance	23,862	22,319
Other
Distribution of separate account balances by asset type for variable annuity contracts providing guaranteed benefits:
Separate account balance	$ 1,969	$ 2,208