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A valuation allowance for financing receivables that are expected to be uncollectible.

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Amount of direct write-downs of financing receivables charged against the allowance.

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Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

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Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

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Amount of investment in impaired financing receivables for which there is a related allowance for credit losses.

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Amount of loan with fixed rate of interest.

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Amount of loan with variable or adjustable rate of interest.

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The balance represents the amount of loans that are secured by real estate mortgages, offset by the reserve to cover probable credit losses on the loan portfolio.

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Amount of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value.

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Investments (Details 13) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Mar. 31, 2014	Dec. 31, 2013
Carrying value of non-impaired mortgage loans, summarized by debt service coverage ratio distribution
Total mortgage loans		$ 4,174			$ 4,721
Mortgage loans, non-impaired
Carrying value of non-impaired mortgage loans, summarized by debt service coverage ratio distribution
Fixed rate mortgage loans		4,099			4,561
Variable rate mortgage loans		62			79
Total mortgage loans		4,161			4,640
Net carrying value of impaired mortgage loans
Impaired mortgage loans with a valuation allowance		13			81
Total impaired mortgage loans		13			81
Valuation allowance on impaired mortgage loans	21	9	21	9
Average carrying value and interest income recognized on impaired mortgage loans
Average impaired mortgage loans		36	89
Rollforward of the valuation allowance on impaired mortgage loans
Valuation allowance on impaired mortgage loans, beginning balance	15	21	42	9
Net increase (decrease) in valuation allowance	9	(4)	(17)
Charge offs	(3)	(8)	(4)
Valuation allowance on impaired mortgage loans, ending balance	21	9	21	9
Mortgage loans, non-impaired \| Below 1.0
Carrying value of non-impaired mortgage loans, summarized by debt service coverage ratio distribution
Fixed rate mortgage loans		172			153
Total mortgage loans		172			153
Mortgage loans, non-impaired \| 1.0 - 1.25
Carrying value of non-impaired mortgage loans, summarized by debt service coverage ratio distribution
Fixed rate mortgage loans		489			613
Total mortgage loans		489			613
Mortgage loans, non-impaired \| 1.26 - 1.50
Carrying value of non-impaired mortgage loans, summarized by debt service coverage ratio distribution
Fixed rate mortgage loans		1,134			1,233
Variable rate mortgage loans		2			2
Total mortgage loans		1,136			1,235
Mortgage loans, non-impaired \| Above 1.50
Carrying value of non-impaired mortgage loans, summarized by debt service coverage ratio distribution
Fixed rate mortgage loans		2,304			2,562
Variable rate mortgage loans		60			77
Total mortgage loans		$ 2,364			$ 2,639