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Fair Value Measurements Investment Fair Value (Details) (USD $)
In Millions, unless otherwise specified

Mar. 31, 2013

Dec. 31, 2012

Investments [Abstract]

Investments

$ 7,690

$ 5,491

Securities sold, not yet purchased, at fair value:

Securities sold, not yet purchased, at fair value

620

533

Investment Segment [Member]

Investments [Abstract]

Investments

7,226

5,084

Securities sold, not yet purchased, at fair value:

Securities sold, not yet purchased, at fair value

620

533

Investment Segment [Member] | Level 1 [Member] | Recurring measurement [Member]

Investments [Abstract]

Investments

6,146

4,134

Derivative contracts, at fair value (asset)

0

^[1]

0

^[1]

Fair value of investment and derivative assets

6,146

4,134

Securities sold, not yet purchased, at fair value:

Derivative contracts at fair value (liability)

0

^[2]

0

^[2]

Fair value of derivative and other liabilities

620

473

Investment Segment [Member] | Level 1 [Member] | Recurring measurement [Member] | Equity securities:

Investments [Abstract]

Trading securities

6,146

4,134

Securities sold, not yet purchased, at fair value:

Securities sold, not yet purchased, at fair value

620

473

Investment Segment [Member] | Level 1 [Member] | Recurring measurement [Member] | Equity securities: | Basic materials

Investments [Abstract]

Trading securities

53

144

Investment Segment [Member] | Level 1 [Member] | Recurring measurement [Member] | Equity securities: | Communications

Investments [Abstract]

Trading securities

1,036

560

Investment Segment [Member] | Level 1 [Member] | Recurring measurement [Member] | Equity securities: | Consumer, non-cyclical

Investments [Abstract]

Trading securities

1,894

1,340

Investment Segment [Member] | Level 1 [Member] | Recurring measurement [Member] | Equity securities: | Consumer, cyclical

Investments [Abstract]

Trading securities

337

261

Securities sold, not yet purchased, at fair value:

Securities sold, not yet purchased, at fair value

620

473

Investment Segment [Member] | Level 1 [Member] | Recurring measurement [Member] | Equity securities: | Diversified

Investments [Abstract]

Trading securities

28

0

Investment Segment [Member] | Level 1 [Member] | Recurring measurement [Member] | Equity securities: | Energy

Investments [Abstract]

Trading securities

1,921

1,052

Investment Segment [Member] | Level 1 [Member] | Recurring measurement [Member] | Equity securities: | Financial

Investments [Abstract]

Trading securities

234

244

Investment Segment [Member] | Level 1 [Member] | Recurring measurement [Member] | Equity securities: | Funds

Investments [Abstract]

Trading securities

0

0

Securities sold, not yet purchased, at fair value:

Securities sold, not yet purchased, at fair value

0

0

Investment Segment [Member] | Level 1 [Member] | Recurring measurement [Member] | Equity securities: | Technology

Investments [Abstract]

Trading securities

641

325

Investment Segment [Member] | Level 1 [Member] | Recurring measurement [Member] | Equity securities: | Utilities

Investments [Abstract]

Trading securities

2

208

Investment Segment [Member] | Level 1 [Member] | Recurring measurement [Member] | Corporate debt:

Investments [Abstract]

Trading securities

0

0

Investment Segment [Member] | Level 1 [Member] | Recurring measurement [Member] | Corporate debt: | Consumer, cyclical

Investments [Abstract]

Trading securities

0

0

Investment Segment [Member] | Level 1 [Member] | Recurring measurement [Member] | Corporate debt: | Financial

Investments [Abstract]

Trading securities

0

0

Investment Segment [Member] | Level 1 [Member] | Recurring measurement [Member] | Corporate debt: | Sovereign debt

Investments [Abstract]

Trading securities

0

0

Investment Segment [Member] | Level 1 [Member] | Recurring measurement [Member] | Corporate debt: | Utilities

Investments [Abstract]

Trading securities

0

0

Investment Segment [Member] | Level 1 [Member] | Recurring measurement [Member] | Mortgage-backed securities: | Financial

Investments [Abstract]

Trading securities

0

0

Investment Segment [Member] | Level 2 [Member] | Recurring measurement [Member]

Investments [Abstract]

Investments

790

662

Derivative contracts, at fair value (asset)

1

^[1]

0

^[1]

Fair value of investment and derivative assets

791

662

Securities sold, not yet purchased, at fair value:

Derivative contracts at fair value (liability)

478

^[2]

84

^[2]

Fair value of derivative and other liabilities

478

144

Investment Segment [Member] | Level 2 [Member] | Recurring measurement [Member] | Equity securities:

Investments [Abstract]

Trading securities

567

388

Securities sold, not yet purchased, at fair value:

Securities sold, not yet purchased, at fair value

0

60

Investment Segment [Member] | Level 2 [Member] | Recurring measurement [Member] | Equity securities: | Basic materials

Investments [Abstract]

Trading securities

9

9

Investment Segment [Member] | Level 2 [Member] | Recurring measurement [Member] | Equity securities: | Communications

Investments [Abstract]

Trading securities

14

16

Investment Segment [Member] | Level 2 [Member] | Recurring measurement [Member] | Equity securities: | Consumer, non-cyclical

Investments [Abstract]

Trading securities

0

0

Investment Segment [Member] | Level 2 [Member] | Recurring measurement [Member] | Equity securities: | Consumer, cyclical

Investments [Abstract]

Trading securities

0

0

Securities sold, not yet purchased, at fair value:

Securities sold, not yet purchased, at fair value

0

0

Investment Segment [Member] | Level 2 [Member] | Recurring measurement [Member] | Equity securities: | Diversified

Investments [Abstract]

Trading securities

0

0

Investment Segment [Member] | Level 2 [Member] | Recurring measurement [Member] | Equity securities: | Energy

Investments [Abstract]

Trading securities

19

55

Investment Segment [Member] | Level 2 [Member] | Recurring measurement [Member] | Equity securities: | Financial

Investments [Abstract]

Trading securities

0

0

Investment Segment [Member] | Level 2 [Member] | Recurring measurement [Member] | Equity securities: | Funds

Investments [Abstract]

Trading securities

0

308

Securities sold, not yet purchased, at fair value:

Securities sold, not yet purchased, at fair value

0

60

Investment Segment [Member] | Level 2 [Member] | Recurring measurement [Member] | Equity securities: | Technology

Investments [Abstract]

Trading securities

525

0

Investment Segment [Member] | Level 2 [Member] | Recurring measurement [Member] | Equity securities: | Utilities

Investments [Abstract]

Trading securities

0

0

Investment Segment [Member] | Level 2 [Member] | Recurring measurement [Member] | Corporate debt:

Investments [Abstract]

Trading securities

48

86

Investment Segment [Member] | Level 2 [Member] | Recurring measurement [Member] | Corporate debt: | Consumer, cyclical

Investments [Abstract]

Trading securities

0

0

Investment Segment [Member] | Level 2 [Member] | Recurring measurement [Member] | Corporate debt: | Financial

Investments [Abstract]

Trading securities

15

50

Investment Segment [Member] | Level 2 [Member] | Recurring measurement [Member] | Corporate debt: | Sovereign debt

Investments [Abstract]

Trading securities

3

5

Investment Segment [Member] | Level 2 [Member] | Recurring measurement [Member] | Corporate debt: | Utilities

Investments [Abstract]

Trading securities

30

31

Investment Segment [Member] | Level 2 [Member] | Recurring measurement [Member] | Mortgage-backed securities: | Financial

Investments [Abstract]

Trading securities

175

188

Investment Segment [Member] | Level 3 [Member] | Recurring measurement [Member]

Investments [Abstract]

Investments

290

288

Derivative contracts, at fair value (asset)

0

^[1]

0

^[1]

Fair value of investment and derivative assets

290

288

Securities sold, not yet purchased, at fair value:

Derivative contracts at fair value (liability)

0

^[2]

0

^[2]

Fair value of derivative and other liabilities

0

0

Investment Segment [Member] | Level 3 [Member] | Recurring measurement [Member] | Equity securities:

Investments [Abstract]

Trading securities

0

0

Securities sold, not yet purchased, at fair value:

Securities sold, not yet purchased, at fair value

0

0

Investment Segment [Member] | Level 3 [Member] | Recurring measurement [Member] | Equity securities: | Basic materials

Investments [Abstract]

Trading securities

0

0

Investment Segment [Member] | Level 3 [Member] | Recurring measurement [Member] | Equity securities: | Communications

Investments [Abstract]

Trading securities

0

0

Investment Segment [Member] | Level 3 [Member] | Recurring measurement [Member] | Equity securities: | Consumer, non-cyclical

Investments [Abstract]

Trading securities

0

Investment Segment [Member] | Level 3 [Member] | Recurring measurement [Member] | Equity securities: | Consumer, cyclical

Investments [Abstract]

Trading securities

0

0

Securities sold, not yet purchased, at fair value:

Securities sold, not yet purchased, at fair value

0

0

Investment Segment [Member] | Level 3 [Member] | Recurring measurement [Member] | Equity securities: | Diversified

Investments [Abstract]

Trading securities

0

0

Investment Segment [Member] | Level 3 [Member] | Recurring measurement [Member] | Equity securities: | Energy

Investments [Abstract]

Trading securities

0

0

Investment Segment [Member] | Level 3 [Member] | Recurring measurement [Member] | Equity securities: | Financial

Investments [Abstract]

Trading securities

0

0

Investment Segment [Member] | Level 3 [Member] | Recurring measurement [Member] | Equity securities: | Funds

Investments [Abstract]

Trading securities

0

0

Securities sold, not yet purchased, at fair value:

Securities sold, not yet purchased, at fair value

0

0

Investment Segment [Member] | Level 3 [Member] | Recurring measurement [Member] | Equity securities: | Technology

Investments [Abstract]

Trading securities

0

0

Investment Segment [Member] | Level 3 [Member] | Recurring measurement [Member] | Equity securities: | Utilities

Investments [Abstract]

Trading securities

0

0

Investment Segment [Member] | Level 3 [Member] | Recurring measurement [Member] | Corporate debt:

Investments [Abstract]

Trading securities

290

288

Investment Segment [Member] | Level 3 [Member] | Recurring measurement [Member] | Corporate debt: | Consumer, cyclical

Investments [Abstract]

Trading securities

290

288

Investment Segment [Member] | Level 3 [Member] | Recurring measurement [Member] | Corporate debt: | Financial

Investments [Abstract]

Trading securities

0

0

Investment Segment [Member] | Level 3 [Member] | Recurring measurement [Member] | Corporate debt: | Sovereign debt

Investments [Abstract]

Trading securities

0

0

Investment Segment [Member] | Level 3 [Member] | Recurring measurement [Member] | Corporate debt: | Utilities

Investments [Abstract]

Trading securities

0

0

Investment Segment [Member] | Level 3 [Member] | Recurring measurement [Member] | Mortgage-backed securities: | Financial

Investments [Abstract]

Trading securities

0

0

Investment Segment [Member] | Total fair value [Member] | Recurring measurement [Member]

Investments [Abstract]

Investments

7,226

5,084

Derivative contracts, at fair value (asset)

1

^[1]

0

^[1]

Fair value of investment and derivative assets

7,227

5,084

Securities sold, not yet purchased, at fair value:

Derivative contracts at fair value (liability)

478

^[2]

84

^[2]

Fair value of derivative and other liabilities

1,098

617

Investment Segment [Member] | Total fair value [Member] | Recurring measurement [Member] | Equity securities:

Investments [Abstract]

Trading securities

6,713

4,522

Securities sold, not yet purchased, at fair value:

Securities sold, not yet purchased, at fair value

620

533

Investment Segment [Member] | Total fair value [Member] | Recurring measurement [Member] | Equity securities: | Basic materials

Investments [Abstract]

Trading securities

62

153

Investment Segment [Member] | Total fair value [Member] | Recurring measurement [Member] | Equity securities: | Communications

Investments [Abstract]

Trading securities

1,050

576

Investment Segment [Member] | Total fair value [Member] | Recurring measurement [Member] | Equity securities: | Consumer, non-cyclical

Investments [Abstract]

Trading securities

1,894

1,340

Investment Segment [Member] | Total fair value [Member] | Recurring measurement [Member] | Equity securities: | Consumer, cyclical

Investments [Abstract]

Trading securities

337

261

Securities sold, not yet purchased, at fair value:

Securities sold, not yet purchased, at fair value

620

473

Investment Segment [Member] | Total fair value [Member] | Recurring measurement [Member] | Equity securities: | Diversified

Investments [Abstract]

Trading securities

28

0

Investment Segment [Member] | Total fair value [Member] | Recurring measurement [Member] | Equity securities: | Energy

Investments [Abstract]

Trading securities

1,940

1,107

Investment Segment [Member] | Total fair value [Member] | Recurring measurement [Member] | Equity securities: | Financial

Investments [Abstract]

Trading securities

234

244

Investment Segment [Member] | Total fair value [Member] | Recurring measurement [Member] | Equity securities: | Funds

Investments [Abstract]

Trading securities

0

308

Securities sold, not yet purchased, at fair value:

Securities sold, not yet purchased, at fair value

0

60

Investment Segment [Member] | Total fair value [Member] | Recurring measurement [Member] | Equity securities: | Technology

Investments [Abstract]

Trading securities

1,166

325

Investment Segment [Member] | Total fair value [Member] | Recurring measurement [Member] | Equity securities: | Utilities

Investments [Abstract]

Trading securities

2

208

Investment Segment [Member] | Total fair value [Member] | Recurring measurement [Member] | Corporate debt:

Investments [Abstract]

Trading securities

338

374

Investment Segment [Member] | Total fair value [Member] | Recurring measurement [Member] | Corporate debt: | Consumer, cyclical

Investments [Abstract]

Trading securities

290

288

Investment Segment [Member] | Total fair value [Member] | Recurring measurement [Member] | Corporate debt: | Financial

Investments [Abstract]

Trading securities

15

50

Investment Segment [Member] | Total fair value [Member] | Recurring measurement [Member] | Corporate debt: | Sovereign debt

Investments [Abstract]

Trading securities

3

5

Investment Segment [Member] | Total fair value [Member] | Recurring measurement [Member] | Corporate debt: | Utilities

Investments [Abstract]

Trading securities

30

31

Investment Segment [Member] | Total fair value [Member] | Recurring measurement [Member] | Mortgage-backed securities: | Financial

Investments [Abstract]

Trading securities

$ 175

$ 188

[1]	Included in other assets in our consolidated balance sheets.
[2]	Included in accrued expenses and other liabilities in our consolidated balance sheets.

X

- Definition

This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 10

-Section 50

-Paragraph 2

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

-Publisher FASB

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- Definition

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

-Publisher FASB

-Name Accounting Standards Codification

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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

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Sum of the carrying amounts as of the balance sheet date of all investments.

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

-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 210

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-Subparagraph (SX 210.7-03.1(h))

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-Name Accounting Standards Codification

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-Paragraph 2

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+ References

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

-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 405

-Section 25

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6957929&loc=d3e63862-112815



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+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 25

-Paragraph 1

-Subparagraph (a)

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-Name Statement of Financial Accounting Standard (FAS)

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-Paragraph 12

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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