Variable Annuity and Insurance Guarantees (Details 2) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
GMDB and GGU
Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Gross
Balance, at the beginning of the period	$ 5	$ 5
Incurred claims	5	10
Paid claims	(6)	(7)
Balance, at the end of the period	4	8
GMIB
Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Gross
Balance, at the beginning of the period	9	8
Incurred claims	1	2
Paid claims	(1)	(1)
Balance, at the end of the period	9	9
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
Incurred claims	(304)	1,013
Balance, at the end of the period	1,073	1,350
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
Incurred claims	(103)	172
Balance, at the end of the period	134	276
UL
Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Gross
Balance, at the beginning of the period	111	68
Incurred claims	39	38
Paid claims	(8)	(9)
Balance, at the end of the period	$ 142	$ 97