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Fair Value Measurements Investment Fair Value (Details) (USD $) In Millions, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Investments [Abstract] |  |  |  |
Investments | $ 12,275 |  | $ 5,491 |
Securities sold, not yet purchased, at fair value: |  |  |  |
Securities sold, not yet purchased, at fair value | 704 |  | 533 |
Investment Segment [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Investments | 11,825 |  | 5,084 |
Securities sold, not yet purchased, at fair value: |  |  |  |
Securities sold, not yet purchased, at fair value | 704 |  | 533 |
Investment Segment [Member] | Level 1 [Member] | Recurring measurement [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Investments | 11,122 |  | 4,134 |
Derivative contracts, at fair value (asset) | 0 | [1] | 0 | [1]
Fair value of investment and derivative assets | 11,122 |  | 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 | 704 |  | 473 |
Investment Segment [Member] | Level 1 [Member] | Recurring measurement [Member] | Equity securities: |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 11,122 |  | 4,134 |
Securities sold, not yet purchased, at fair value: |  |  |  |
Securities sold, not yet purchased, at fair value | 704 |  | 473 |
Investment Segment [Member] | Level 1 [Member] | Recurring measurement [Member] | Equity securities: | Basic materials |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 46 |  | 144 |
Investment Segment [Member] | Level 1 [Member] | Recurring measurement [Member] | Equity securities: | Communications |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 1,567 |  | 560 |
Investment Segment [Member] | Level 1 [Member] | Recurring measurement [Member] | Equity securities: | Consumer, non-cyclical |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 2,101 |  | 1,340 |
Investment Segment [Member] | Level 1 [Member] | Recurring measurement [Member] | Equity securities: | Consumer, cyclical |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 395 |  | 261 |
Securities sold, not yet purchased, at fair value: |  |  |  |
Securities sold, not yet purchased, at fair value | 704 |  | 473 |
Investment Segment [Member] | Level 1 [Member] | Recurring measurement [Member] | Equity securities: | Diversified |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 27 |  | 0 |
Investment Segment [Member] | Level 1 [Member] | Recurring measurement [Member] | Equity securities: | Energy |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 2,244 |  | 1,052 |
Investment Segment [Member] | Level 1 [Member] | Recurring measurement [Member] | Equity securities: | Financial |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 282 |  | 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 | 4,460 |  | 325 |
Investment Segment [Member] | Level 1 [Member] | Recurring measurement [Member] | Equity securities: | Utilities |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 0 |  | 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 | 415 |  | 662 |
Derivative contracts, at fair value (asset) | 26 | [1] | 0 | [1]
Fair value of investment and derivative assets | 441 |  | 662 |
Securities sold, not yet purchased, at fair value: |  |  |  |
Derivative contracts at fair value (liability) | 499 | [2] | 84 | [2]
Fair value of derivative and other liabilities | 499 |  | 144 |
Investment Segment [Member] | Level 2 [Member] | Recurring measurement [Member] | Equity securities: |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 199 |  | 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 | 31 |  | 9 |
Investment Segment [Member] | Level 2 [Member] | Recurring measurement [Member] | Equity securities: | Communications |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 20 |  | 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 | 148 |  | 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 | 0 |  | 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 | 44 |  | 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 | 11 |  | 50 |
Investment Segment [Member] | Level 2 [Member] | Recurring measurement [Member] | Corporate debt: | Sovereign debt |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 5 |  | 5 |
Investment Segment [Member] | Level 2 [Member] | Recurring measurement [Member] | Corporate debt: | Utilities |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 28 |  | 31 |
Investment Segment [Member] | Level 2 [Member] | Recurring measurement [Member] | Mortgage-backed securities: | Financial |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 172 |  | 188 |
Investment Segment [Member] | Level 3 [Member] | Recurring measurement [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Investments | 288 |  | 288 |
Derivative contracts, at fair value (asset) | 0 | [1] | 0 | [1]
Fair value of investment and derivative assets | 288 |  | 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 | 288 |  | 288 |
Investment Segment [Member] | Level 3 [Member] | Recurring measurement [Member] | Corporate debt: | Consumer, cyclical |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 288 |  | 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 | 11,825 |  | 5,084 |
Derivative contracts, at fair value (asset) | 26 | [1] | 0 | [1]
Fair value of investment and derivative assets | 11,851 |  | 5,084 |
Securities sold, not yet purchased, at fair value: |  |  |  |
Derivative contracts at fair value (liability) | 499 | [2] | 84 | [2]
Fair value of derivative and other liabilities | 1,203 |  | 617 |
Investment Segment [Member] | Total fair value [Member] | Recurring measurement [Member] | Equity securities: |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 11,321 |  | 4,522 |
Securities sold, not yet purchased, at fair value: |  |  |  |
Securities sold, not yet purchased, at fair value | 704 |  | 533 |
Investment Segment [Member] | Total fair value [Member] | Recurring measurement [Member] | Equity securities: | Basic materials |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 77 |  | 153 |
Investment Segment [Member] | Total fair value [Member] | Recurring measurement [Member] | Equity securities: | Communications |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 1,587 |  | 576 |
Investment Segment [Member] | Total fair value [Member] | Recurring measurement [Member] | Equity securities: | Consumer, non-cyclical |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 2,101 |  | 1,340 |
Investment Segment [Member] | Total fair value [Member] | Recurring measurement [Member] | Equity securities: | Consumer, cyclical |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 395 |  | 261 |
Securities sold, not yet purchased, at fair value: |  |  |  |
Securities sold, not yet purchased, at fair value | 704 |  | 473 |
Investment Segment [Member] | Total fair value [Member] | Recurring measurement [Member] | Equity securities: | Diversified |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 27 |  | 0 |
Investment Segment [Member] | Total fair value [Member] | Recurring measurement [Member] | Equity securities: | Energy |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 2,392 |  | 1,107 |
Investment Segment [Member] | Total fair value [Member] | Recurring measurement [Member] | Equity securities: | Financial |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 282 |  | 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 | 4,460 |  | 325 |
Investment Segment [Member] | Total fair value [Member] | Recurring measurement [Member] | Equity securities: | Utilities |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 0 |  | 208 |
Investment Segment [Member] | Total fair value [Member] | Recurring measurement [Member] | Corporate debt: |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 332 |  | 374 |
Investment Segment [Member] | Total fair value [Member] | Recurring measurement [Member] | Corporate debt: | Consumer, cyclical |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 288 |  | 288 |
Investment Segment [Member] | Total fair value [Member] | Recurring measurement [Member] | Corporate debt: | Financial |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 11 |  | 50 |
Investment Segment [Member] | Total fair value [Member] | Recurring measurement [Member] | Corporate debt: | Sovereign debt |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 5 |  | 5 |
Investment Segment [Member] | Total fair value [Member] | Recurring measurement [Member] | Corporate debt: | Utilities |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 28 |  | 31 |
Investment Segment [Member] | Total fair value [Member] | Recurring measurement [Member] | Mortgage-backed securities: | Financial |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | $ 172 |  | $ 188 |
[1] | Included in other assets in our consolidated balance sheets.
[2] | Included in accrued expenses and other liabilities in our consolidated balance sheets.

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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset. + 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=28364263&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13495-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=20225523&loc=SL20225862-175312 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226008-175313 + Details
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- Definition Sum of the carrying amounts as of the balance sheet date of all investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(h)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Subparagraph h -Article 7 + Details
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- Definition Amount of investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26626-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Trading Securities -URI http://asc.fasb.org/extlink&oid=6526789 + Details
Name: | us-gaap_TradingSecurities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant