Variable Annuity and Insurance Guarantees (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended			3 Months Ended
Mar. 31, 2013 GMDB and GGU	Mar. 31, 2012 GMDB and GGU	Mar. 31, 2012 GMIB	Mar. 31, 2013 GMIB	Dec. 31, 2012 GMIB	Mar. 31, 2013 Variable annuity guaranteed minimum withdrawal benefits ("GMWB")	Mar. 31, 2012 Variable annuity guaranteed minimum withdrawal benefits ("GMWB")	Mar. 31, 2013 Variable annuity guaranteed minimum accumulation benefits ("GMAB")	Mar. 31, 2012 Variable annuity guaranteed minimum accumulation benefits ("GMAB")	Mar. 31, 2013 UL	Mar. 31, 2012 UL
Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Gross
Balance, at the beginning of the period	$ 4	$ 5	$ 9	$ 9	$ 9	$ 799	$ 1,377	$ 103	$ 237	$ 155	$ 111
Incurred claims	1		(2)			(480)	(624)	(80)	(119)	17	17
Paid claims	(1)	(2)								(3)	(4)
Balance, at the end of the period	$ 4	$ 3	$ 7	$ 9	$ 9	$ 319	$ 753	$ 23	$ 118	$ 169	$ 124

Sum of the amount of expected guaranteed benefits in excess of the projected account balances for minimum guaranteed benefit contracts as of the balance sheet date for all guaranteed benefit types.

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Total of amount of guaranteed minimum benefit expense incurred during the period presented, resulting in an increase to the liability for expected guaranteed minimum benefits in excess of projected account values, for all guaranteed benefit types.

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- Definition

Total amount of guaranteed minimum benefit payments to policyholders and contract holders, during the period presented, resulting in a decrease to the liability for expected guaranteed minimum benefits in excess of projected account values, for all guaranteed benefit types.

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