Commitments, Guarantees and Contingencies (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Aggregate minimum rentals under noncancelable operating leases
2013	$ 83
2014	77
2015	69
2016	57
2017	55
Thereafter	131
Total	472
Operating lease expense	84	91	91
Funding Commitments
Commercial mortgage loan commitments	76	19
Consumer mortgage loan commitments	627	730
Consumer lines of credit	5	1,685
Affordable housing Partnerships	144	267
Total funding commitments	852	2,701
Minimum interest rate guarantees, high end of the range (as a percent)	5.00%
Liability related to guaranty fund assessments	26
Premium tax asset	19
Minimum [Member]
Contingencies
Damages sought by plaintiffs	$ 20

The amount of the obligation related to Affordable Housing partnerships, which qualify for low income tax credits.

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Represents the amount of future commercial mortgage loan commitments of the entity.

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Represents the high end of the range for the minimum interest rate guarantees in fixed accounts of life and annuity products.

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Rental expense incurred for leased assets including furniture and equipment which has not been recognized in costs and expenses applicable to sales and revenues; for example, cost of goods sold or other operating costs and expenses.

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The amount of insurance-related assessment liability that is expected to be recovered through a premium tax offset based on current laws applied to in-force policies.

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The value (monetary amount) of the award the plaintiff seeks in the legal matter.

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The liability as of the balance sheet date representing required funding mandated by statute or regulatory authority that is related directly or indirectly to underwriting activities, including pools for self-insurance and excluding premium taxes and income taxes. The funds derived from the assessments generally enable a government guarantor to pay insurance claims in the event that the underwriting insurer is insolvent or otherwise unable to meet its payment obligations.

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Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year.

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Amount of required minimum rental payments maturing in the next fiscal year following the latest fiscal year for operating leases having an initial or remaining non-cancelable letter-terms in excess of one year.

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Amount of required minimum rental payments maturing in the fifth fiscal year following the latest fiscal year for operating leases having an initial or remaining non-cancelable letter-terms in excess of one year.

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Amount of required minimum rental payments maturing in the forth fiscal year following the latest fiscal year for operating leases having an initial or remaining non-cancelable letter-terms in excess of one year.

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Amount of required minimum rental payments maturing in the third fiscal year following the latest fiscal year for operating leases having an initial or remaining non-cancelable letter-terms in excess of one year.

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Amount of required minimum rental payments maturing in the second fiscal year following the latest fiscal year for operating leases having an initial or remaining non-cancelable letter-terms in excess of one year.

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Amount of required minimum rental payments maturing after the fifth fiscal year following the latest fiscal year for operating leases having an initial or remaining non-cancelable letter-terms in excess of one year.

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