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Investments - Changes in Valuation Reserves, Commercial Mortgage Loans (Details) (Commercial Real Estate Portfolio Segment [Member], USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Reserve balance, January 1,	$ 7	$ 19
Increase in valuation reserves	4	10
Charge-offs upon sales and repayments, net of recoveries	0	(3)
Transfers to foreclosed real estate	0	(3)
Transfers to other long-term investments	0	(16)
Reserve balance, September 30,	$ 11	$ 7

The sum of the periodic provision charged to earnings, based on an assessment of uncollectibility from the counterparty on account of loan, lease or other credit losses, to reduce these accounts to the amount that approximates their net realizable value.

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