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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.

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Period Type: | instant

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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Trading Securities which consist of all investments in certain debt and equity securities that are bought and held principally for the purpose of selling them in the near term (thus held for only a short period of time) or for which an entity has elected the fair value option. Trading generally reflects active and frequent buying and selling, and trading securities are generally used with the objective of generating profits on short-term differences in price, but this category of investments may also include items which are not intended to be sold in the near term or for which the fair value option has been elected. + 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) -URI http://asc.fasb.org/extlink&oid=7534914&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 12 -Subparagraph a -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 3: 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_TradingSecuritiesFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant