Variable Annuity and Insurance Guarantees (Distribution of Account Balances by Asset Type) (Details 3) (USD $) In Millions, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Mutual funds
Distribution of separate account balances by asset type for variable annuity contracts providing guaranteed benefits:
Total mutual funds	$ 71,547	$ 69,478
Equity
Distribution of separate account balances by asset type for variable annuity contracts providing guaranteed benefits:
Total mutual funds	40,724	39,195
Bond
Distribution of separate account balances by asset type for variable annuity contracts providing guaranteed benefits:
Total mutual funds	25,965	26,519
Other
Distribution of separate account balances by asset type for variable annuity contracts providing guaranteed benefits:
Total mutual funds	$ 4,858	$ 3,764