Variable Interest Entities (Asset & Liability Balances) (Details) (Consolidated investment entities [Member], USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Liabilities
Debt	$ 5,933us-gaap_DebtInstrumentFairValue	$ 6,030us-gaap_DebtInstrumentFairValue
Other liabilities	119	193
Recurring basis [Member] \| Level 1 [Member]
Assets
Investments	143	134
Total assets at fair value	143	134
Recurring basis [Member] \| Level 1 [Member] \| Common stocks [Member]
Assets
Investments	139	130
Recurring basis [Member] \| Level 1 [Member] \| Other Investments [Member]
Assets
Investments	4	4
Recurring basis [Member] \| Level 2 [Member]
Assets
Investments	5,469	5,523
Receivables	31	49
Other assets	1	1
Total assets at fair value	5,501	5,573
Liabilities
Other liabilities	119	193
Total liabilities at fair value	119	193
Recurring basis [Member] \| Level 2 [Member] \| Corporate debt securities [Member]
Assets
Investments	168	171
Recurring basis [Member] \| Level 2 [Member] \| Common stocks [Member]
Assets
Investments	34	40
Recurring basis [Member] \| Level 2 [Member] \| Other Investments [Member]
Assets
Investments	25	25
Recurring basis [Member] \| Level 2 [Member] \| Syndicated loans [Member]
Assets
Investments	5,242	5,287
Recurring basis [Member] \| Level 3 [Member]
Assets
Investments	478	491
Other assets	1,889	1,935
Total assets at fair value	2,367	2,426
Liabilities
Debt	5,933	6,030
Total liabilities at fair value	5,933	6,030
Recurring basis [Member] \| Level 3 [Member] \| Common stocks [Member]
Assets
Investments	11	7
Recurring basis [Member] \| Level 3 [Member] \| Syndicated loans [Member]
Assets
Investments	467	484
Recurring basis [Member] \| Total [Member]
Assets
Investments	6,090	6,148
Receivables	31	49
Other assets	1,890	1,936
Total assets at fair value	8,011	8,133
Liabilities
Debt	5,933	6,030
Other liabilities	119	193
Total liabilities at fair value	6,052	6,223
Recurring basis [Member] \| Total [Member] \| Corporate debt securities [Member]
Assets
Investments	168	171
Recurring basis [Member] \| Total [Member] \| Common stocks [Member]
Assets
Investments	184	177
Recurring basis [Member] \| Total [Member] \| Other Investments [Member]
Assets
Investments	29	29
Recurring basis [Member] \| Total [Member] \| Syndicated loans [Member]
Assets
Investments	$ 5,709	$ 5,771

Fair value portion of amount due from customers or clients for goods or services, including trade receivables, that have been delivered or sold in the normal course of business, and amounts due from others, including related parties.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 14

-URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13487-108611

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 3

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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

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- Definition

Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 10

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13433-108611

Reference 2: http://www.xbrl.org/2003/role/presentationRef

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-Topic 825

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- Definition

Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Available-for-Sale Securities

-URI http://asc.fasb.org/extlink&oid=6505594

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Trading Securities

-URI http://asc.fasb.org/extlink&oid=6526789

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 25

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Subparagraph a, f, g

-Article 7

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 35

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=27723805&loc=d3e24584-111560

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Fair value of financial and nonfinancial obligations.

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- Definition

Fair value portion of other assets.

+ References

No definition available.

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- Definition

Fair value portion of other liabilities.

+ References

No definition available.

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