Variable Annuity and Insurance Guarantees (Separate Account Balances by Type) (Details) - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
Mutual funds
Variable Annuity and Insurance Guarantees
Total mutual funds	$ 70,978	$ 70,953
Equity [Member]
Variable Annuity and Insurance Guarantees
Total mutual funds	41,180	41,403
Bond [Member]
Variable Annuity and Insurance Guarantees
Total mutual funds	24,736	25,060
Other [Member]
Variable Annuity and Insurance Guarantees
Total mutual funds	$ 5,062	$ 4,490