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 mortgage loans, summarized by debt service coverage ratio distribution
Total mortgage loans	$ 4,721	$ 6,570
Mortgage loans, non-impaired
Carrying value of non-impaired mortgage loans, summarized by debt service coverage ratio distribution
Fixed rate mortgage loans	4,561	6,201
Variable rate mortgage loans	79	214
Total mortgage loans	4,640	6,415
Net carrying value of impaired mortgage loans
Impaired mortgage loans with a valuation allowance	81	147
Impaired mortgage loans without a valuation allowance		8
Total impaired mortgage loans	81	155
Valuation allowance on impaired mortgage loans	21	42	63
Rollforward of the valuation allowance on impaired mortgage loans
Valuation allowance on impaired mortgage loans, beginning balance	42	63	84
Net (decrease) increase in valuation allowance	(11)	(5)	37
Charge offs	(8)	(16)	(58)
Mortgage loans classified as held for sale	(2)
Valuation allowance on impaired mortgage loans, ending balance	21	42	63
Carrying value of past due mortgage loans
Less than 90 days past due		21
90 days or greater past due		4
Total past due		25
Current loans	4,721	6,545
Carrying value of mortgage loans	4,721	6,570
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	153	267
Total mortgage loans	153	267
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	613	1,208
Variable rate mortgage loans		20
Total mortgage loans	613	1,228
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	1,233	1,458
Variable rate mortgage loans	2	46
Total mortgage loans	1,235	1,504
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	2,562	3,268
Variable rate mortgage loans	77	148
Total mortgage loans	2,639	3,416
Mortgage loans
Average carrying value and interest income recognized on impaired mortgage loans
Average impaired mortgage loans	$ 88	$ 202	$ 210

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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 loan with fixed rate of interest.

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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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