Variable Annuity and Insurance Guarantees (Liability Rollforward) (Details) - USD ($) $ in Millions		9 Months Ended
		Sep. 30, 2016	Sep. 30, 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		10	9
Paid claims		(7)	(3)
Balance, at the end of the period		17	15
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]	1,056	580
Balance, at the end of the period	[1]	2,113	1,273
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]	9	72
Paid claims	[1]	(1)
Balance, at the end of the period	[1]	8	31
UL [Member]
Changes in Additional Liabilities for Variable Annuity and Insurance Guarantees
Balance, at the beginning of the period		332	263
Incurred claims		99	70
Paid claims		(18)	(19)
Balance, at the end of the period		$ 413	$ 314

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