Variable Annuity and Insurance Guarantees (Details 2) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
GMDB and GGU
Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Gross
Balance, at the beginning of the period	$ 5	$ 5	$ 6
Incurred claims	6	10	17
Paid claims	(7)	(10)	(18)
Balance, at the end of the period	4	5	5
GMIB
Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Gross
Balance, at the beginning of the period	9	8	6
Incurred claims	1	2	3
Paid claims	(1)	(1)	(1)
Balance, at the end of the period	9	9	8
Variable annuity guaranteed minimum withdrawal benefits ("GMWB")
Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Gross
Balance, at the beginning of the period	1,377	337	204
Incurred claims	(578)	1,040	133
Balance, at the end of the period	799	1,377	337
Variable annuity guaranteed minimum accumulation benefits ("GMAB")
Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Gross
Balance, at the beginning of the period	237	104	100
Incurred claims	(134)	133	4
Balance, at the end of the period	103	237	104
UL
Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Gross
Balance, at the beginning of the period	111	68	15
Incurred claims	57	53	59
Paid claims	(13)	(10)	(6)
Balance, at the end of the period	$ 155	$ 111	$ 68