Investments-Carrying Value of Non-impaired Fixed Rate and Variable Rate Morgage Loans (Details 13) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Carrying value of non-impaired fixed rate and variable rate mortgage loans by debt service coverage ratio distribution
Total mortgage loans	$ 3,795		$ 3,686
Net carrying value of impaired mortgage loans
Impaired mortgage loans with a valuation allowance	16		16
Impaired mortgage loans without a valuation allowance	0		0
Total impaired mortgage loans	16		16
Valuation allowance on impaired mortgage loans	8	9
Rollforward of the valuation allowance on impaired mortgage loans
Beginning balance	8	21
Valuation Allowances and Reserves, Period Increase (Decrease)	0	(4)
Charge offs	0	(8)
Ending balance	8	9
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	3,778		3,669
Variable rate mortgage loans	1		1
Total mortgage loans	3,779		3,670
Carrying value of past due mortgage loans
Less than 90 days past due	6		0
90 days or greater past due	0		0
Total past due	6		0
Current loans	3,789		3,686
Total mortgage loans	3,795		3,686
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	93		110
Variable rate mortgage loans	0		0
Total mortgage loans	93		110
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	397		387
Variable rate mortgage loans	0		0
Total mortgage loans	397		387
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	1,136		1,118
Variable rate mortgage loans	1		1
Total mortgage loans	1,137		1,119
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	2,152		2,054
Variable rate mortgage loans	0		0
Total mortgage loans	2,152		2,054
Mortgage loans
Average carrying value and interest income recognized on impaired mortgage loans
Average balance impaired mortgage loans	$ 16	$ 46

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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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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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Total increases or decreases in allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs.

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