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Investments - Valuation Reserves for Commercial Mortgage Loans (Details) (Mortgage Loans on Real Estate [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Mortgage Loans on Real Estate [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	(3)	(3)
Transfers to foreclosed real estate	0	(3)
Transfers to other long-term investments	0	(16)
Reserve balance, December 31,	$ 8	$ 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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