Financing Receivables (Allowance for Loan Losses) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	$ 37	$ 44	$ 60
Charge-offs	(4)	(7)	(22)
Recoveries	1	1	1
Provisions	1	(1)	5
Ending balance	35	37	44
Individually evaluated for impairment	9	9	7
Collectively evaluated for impairment	26	28	37
Recorded investment in financing receivables by impairment method and type of loan
Individually evaluated for impairment	42	58
Collectively evaluated for impairment	3,951	3,883
Total	3,993us-gaap_NotesReceivableGross	3,941us-gaap_NotesReceivableGross
Recorded investment in financing receivables individually evaluated for impairment with no related allowance for loan losses	13	21
Commercial mortgage loans [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	26	29	35
Charge-offs	(1)	(3)	(6)
Ending balance	25	26	29
Individually evaluated for impairment	8	8	6
Collectively evaluated for impairment	17	18	23
Recorded investment in financing receivables by impairment method and type of loan
Individually evaluated for impairment	31	42
Collectively evaluated for impairment	2,698	2,640
Total	2,729	2,682
Syndicated loans [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	6	7	9
Charge-offs	(2)	(1)	(2)
Provisions	2
Ending balance	6	6	7
Collectively evaluated for impairment	6	6	7
Recorded investment in financing receivables by impairment method and type of loan
Individually evaluated for impairment	4	9
Collectively evaluated for impairment	507	370
Total	511	379
Consumer loans [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	5	8	16
Charge-offs	(1)	(3)	(14)
Recoveries	1	1	1
Provisions	(1)	(1)	5
Ending balance	4	5	8
Individually evaluated for impairment	1	1	1
Collectively evaluated for impairment	3	4	7
Recorded investment in financing receivables by impairment method and type of loan
Individually evaluated for impairment	7	7
Collectively evaluated for impairment	746	873
Total	$ 753	$ 880

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

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 11B

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The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.

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-Publisher FASB

-Name Accounting Standards Codification

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Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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Amount of recovery of financing receivables doubtful of collection that were previously charged off.

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-Publisher FASB

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

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The balance of financing receivables that were collectively evaluated for impairment.

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The balance of financing receivables that were individually evaluated for impairment.

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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 representing an agreement for an unconditional promise by the maker to pay the entity (holder) a definite sum of money at a future date. Such amount may include accrued interest receivable in accordance with the terms of the note. The note also may contain provisions and related items including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among a myriad of other features and characteristics. Excludes amounts related to receivables held-for-sale.

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-Name Accounting Standards Codification

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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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