Investments (Details 13) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Carrying value of non-impaired fixed rate and variable rate mortgage loans by debt service coverage ratio distribution
Total mortgage loans	$ 4,173	$ 5,943
Net carrying value of impaired mortgage loans
Impaired mortgage loans with a valuation allowance	77	147
Impaired mortgage loans without a valuation allowance		8
Total impaired mortgage loans	77	155
Valuation allowance on impaired mortgage loans	21	42	63
Rollforward of the valuation allowance on impaired mortgage loans
Beginning balance	42	63	84
Net (decrease) increase in valuation allowance	(11)	(5)	33
Charge offs	(8)	(16)	(54)
Mortgage loans classified as held for sale	(2)
Ending balance	21	42	63
Carrying value of past due mortgage loans
Less than 90 days past due		20
90 days or greater past due		4
Total past due		24
Current loans	4,173	5,919
Total mortgage loans	4,173	5,943
Non-impaired mortgage loans
Carrying value of non-impaired fixed rate and variable rate mortgage loans by debt service coverage ratio distribution
Fixed rate mortgage loans	4,056	5,642
Variable rate mortgage loans	40	146
Total mortgage loans	4,096	5,788
Non-impaired mortgage loans \| Below 1.0
Carrying value of non-impaired fixed rate and variable rate mortgage loans by debt service coverage ratio distribution
Fixed rate mortgage loans	153	266
Total mortgage loans	153	266
Non-impaired mortgage loans \| 1.0 - 1.25
Carrying value of non-impaired fixed rate and variable rate mortgage loans by debt service coverage ratio distribution
Fixed rate mortgage loans	560	1,158
Total mortgage loans	560	1,158
Non-impaired mortgage loans \| 1.26 - 1.50
Carrying value of non-impaired fixed rate and variable rate mortgage loans by debt service coverage ratio distribution
Fixed rate mortgage loans	1,167	1,364
Variable rate mortgage loans	2	17
Total mortgage loans	1,169	1,381
Non-impaired mortgage loans \| Above 1.50
Carrying value of non-impaired fixed rate and variable rate mortgage loans by debt service coverage ratio distribution
Fixed rate mortgage loans	2,176	2,854
Variable rate mortgage loans	38	129
Total mortgage loans	2,214	2,983
Mortgage loans
Average carrying value and interest income recognized on impaired mortgage loans
Average balance impaired mortgage loans	$ 86	$ 202	$ 207

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Financing receivables that are less than 90 days past due.

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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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The amount of financing receivables reclassified to held for sale during the reporting period.

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Financing receivables that are current.

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Financing receivables that are equal to or greater than 90 days past due.

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Recorded Investment in financing receivables that are past due at the balance sheet date.

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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 in impaired financing receivables for which there is no related allowance for credit losses.

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Amount of loan with fixed rate of interest.

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The carrying amount of the outstanding balance due under the mortgage loan.

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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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