Variable Annuity and Insurance Guarantees (Liability Rollforward) (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2016	Mar. 31, 2015
GMDB and GGU [Member]
Changes in Additional Liabilities for Variable Annuity and Insurance Guarantees
Balance, at the beginning of the period		$ 14	$ 9
Incurred claims		4	1
Paid claims		(4)	(1)
Balance, at the end of the period		14	9
GMIB [Member]
Changes in Additional Liabilities for Variable Annuity and Insurance Guarantees
Balance, at the beginning of the period		8	7
Balance, at the end of the period		8	7
GMWB [Member]
Changes in Additional Liabilities for Variable Annuity and Insurance Guarantees
Balance, at the beginning of the period	[1]	1,057	693
Incurred claims	[1]	649	347
Balance, at the end of the period	[1]	1,706	1,040
GMAB [Member]
Changes in Additional Liabilities for Variable Annuity and Insurance Guarantees
Balance, at the beginning of the period	[1]	0	(41)
Incurred claims	[1]	31	6
Balance, at the end of the period	[1]	31	(35)
UL [Member]
Changes in Additional Liabilities for Variable Annuity and Insurance Guarantees
Balance, at the beginning of the period		332	263
Incurred claims		22	22
Paid claims		(6)	(6)
Balance, at the end of the period		$ 348	$ 279

[1] The incurred claims for GMWB and GMAB represent the total change in the liabilities (contra liabilities).