Variable Annuity and Insurance Guarantees (Liability Rollforward) (Details 4) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
GMDB and GGU [Member]
Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Gross
Balance, at the beginning of the period		$ 14	$ 9	$ 4
Incurred claims		11	10	9
Paid claims		(9)	(5)	(4)
Balance, at the end of the period		16	14	9
GMIB [Member]
Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Gross
Balance, at the beginning of the period		8	7	6
Incurred claims		1	1	1
Paid claims		(1)
Balance, at the end of the period		8	8	7
GMWB [Member]
Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Gross
Balance, at the beginning of the period	[1]	1,057	693	(383)
Incurred claims	[1]	(40)	364	1,076
Balance, at the end of the period	[1]	1,017	1,057	693
GMAB [Member]
Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Gross
Balance, at the beginning of the period	[1]	0	(41)	(62)
Incurred claims	[1]	(23)	41	21
Paid claims	[1]	(1)
Balance, at the end of the period	[1]	(24)	0	(41)
UL [Member]
Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Gross
Balance, at the beginning of the period		332	263	206
Incurred claims		127	92	75
Paid claims		(25)	(23)	(18)
Balance, at the end of the period		$ 434	$ 332	$ 263

[1] The incurred claims for GMWB and GMAB represent the change in the fair value of the liabilities (contra liabilities) less paid claims.