Variable Interest Entities (Asset & Liability Balances) (Details) (Consolidated investment entities [Member], USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Liabilities
Debt	$ 6,030us-gaap_DebtInstrumentFairValue	$ 4,804us-gaap_DebtInstrumentFairValue
Other liabilities	193	193
Recurring basis [Member] \| Level 1 [Member]
Assets
Investments:	134	150
Total assets at fair value	134	150
Recurring basis [Member] \| Level 1 [Member] \| Common stocks [Member]
Assets
Investments:	130	147
Recurring basis [Member] \| Level 1 [Member] \| Other investments [Member]
Assets
Investments:	4	3
Recurring basis [Member] \| Level 2 [Member]
Assets
Investments:	5,523	4,468
Receivables	49	32
Other assets	1	13
Total assets at fair value	5,573	4,513
Liabilities
Other liabilities	193	193
Total liabilities at fair value	193	193
Recurring basis [Member] \| Level 2 [Member] \| Corporate debt securities [Member]
Assets
Investments:	171	200
Recurring basis [Member] \| Level 2 [Member] \| Common stocks [Member]
Assets
Investments:	40	31
Recurring basis [Member] \| Level 2 [Member] \| Other investments [Member]
Assets
Investments:	25	33
Recurring basis [Member] \| Level 2 [Member] \| Syndicated loans [Member]
Assets
Investments:	5,287	4,204
Recurring basis [Member] \| Level 3 [Member]
Assets
Investments:	491	384
Receivables	0
Other assets	1,935	1,936
Total assets at fair value	2,426	2,320
Liabilities
Debt	6,030	4,804
Total liabilities at fair value	6,030	4,804
Recurring basis [Member] \| Level 3 [Member] \| Corporate debt securities [Member]
Assets
Investments:		2
Recurring basis [Member] \| Level 3 [Member] \| Common stocks [Member]
Assets
Investments:	7	14
Recurring basis [Member] \| Level 3 [Member] \| Syndicated loans [Member]
Assets
Investments:	484	368
Recurring basis [Member] \| Total [Member]
Assets
Investments:	6,148	5,002
Receivables	49	32
Other assets	1,936	1,949
Total assets at fair value	8,133	6,983
Liabilities
Debt	6,030	4,804
Other liabilities	193	193
Total liabilities at fair value	6,223	4,997
Recurring basis [Member] \| Total [Member] \| Corporate debt securities [Member]
Assets
Investments:	171	202
Recurring basis [Member] \| Total [Member] \| Common stocks [Member]
Assets
Investments:	177	192
Recurring basis [Member] \| Total [Member] \| Other investments [Member]
Assets
Investments:	29	36
Recurring basis [Member] \| Total [Member] \| Syndicated loans [Member]
Assets
Investments:	$ 5,771	$ 4,572

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

-Paragraph 1

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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

-Subparagraph a, b

-Article 5

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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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-Name Accounting Standards Codification

-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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Fair value portion of other assets.

+ References

No definition available.

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Fair value portion of other liabilities.

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No definition available.

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