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Investments - Changes in Valuation Reserves, Commercial Mortgage Loans (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Schedule Of Financing Receivable Allowance For Credit Losses [Abstract]
Reserve balance, January 1,	$ 7	$ 19
Increase in valuation reserves	0	(3)
Transfers to other long-term investments	0	(16)
Reserve balance, March 31,	$ 7	$ 6

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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