Variable Annuity and Insurance Guarantees (Details 3) (USD $) In Millions, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Mutual funds
Distribution of separate account balances by asset type for variable annuity contracts providing guaranteed benefits:
Separate account balance	$ 61,124	$ 56,569
Equity
Distribution of separate account balances by asset type for variable annuity contracts providing guaranteed benefits:
Separate account balance	33,537	30,738
Bond
Distribution of separate account balances by asset type for variable annuity contracts providing guaranteed benefits:
Separate account balance	25,591	23,862
Other
Distribution of separate account balances by asset type for variable annuity contracts providing guaranteed benefits:
Separate account balance	$ 1,996	$ 1,969