Variable Annuity and Insurance Guarantees (Separate Account Balances by Type) (Details) - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014
Mutual funds
Variable Annuity and Insurance Guarantees
Total mutual funds	$ 67,328	$ 70,953
Equity [Member]
Variable Annuity and Insurance Guarantees
Total mutual funds	38,571	41,403
Bond [Member]
Variable Annuity and Insurance Guarantees
Total mutual funds	23,760	25,060
Other [Member]
Variable Annuity and Insurance Guarantees
Total mutual funds	$ 4,997	$ 4,490