Variable Annuity and Insurance Guarantees (Liability Rollforward) (Details) - USD ($) $ in Millions		9 Months Ended
		Sep. 30, 2015	Sep. 30, 2014
GMDB and GGU [Member]
Changes in Additional Liabilities for Variable Annuity and Insurance Guarantees
Balance, at the beginning of the period		$ 9	$ 4
Incurred claims		9	8
Paid claims		(3)	(3)
Balance, at the end of the period		15	9
GMIB [Member]
Changes in Additional Liabilities for Variable Annuity and Insurance Guarantees
Balance, at the beginning of the period		7	6
Incurred claims		0	1
Balance, at the end of the period		7	7
GMWB [Member]
Changes in Additional Liabilities for Variable Annuity and Insurance Guarantees
Balance, at the beginning of the period		693	(383)
Incurred claims	[1]	580	528
Balance, at the end of the period		1,273	145
GMAB [Member]
Changes in Additional Liabilities for Variable Annuity and Insurance Guarantees
Balance, at the beginning of the period		(41)	(62)
Incurred claims	[1]	72	7
Balance, at the end of the period		31	(55)
UL [Member]
Changes in Additional Liabilities for Variable Annuity and Insurance Guarantees
Balance, at the beginning of the period		263	206
Incurred claims		70	54
Paid claims		(19)	(13)
Balance, at the end of the period		$ 314	$ 247

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