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Fair Value Measurements Investment Fair Value (Details) (USD $) In Millions, unless otherwise specified | Mar. 31, 2014 | Dec. 31, 2013
--- | --- | ---
Investments [Abstract] |  |  |  |
Investments | $ 14,846 |  | $ 12,261 |
Securities sold, not yet purchased, at fair value: |  |  |  |
Securities sold, not yet purchased, at fair value | 898 |  | 884 |
Investment Segment [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Investments | 14,413 |  | 11,826 |
Securities sold, not yet purchased, at fair value: |  |  |  |
Securities sold, not yet purchased, at fair value | 898 |  | 884 |
Investment Segment [Member] | Level 1 [Member] | Recurring measurement [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Investments | 13,609 |  | 11,130 |
Derivative contracts, at fair value (asset) | 0 | [1] | 0 | [1]
Fair value of investment and derivative assets | 13,609 |  | 11,130 |
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 | 898 |  | 876 |
Investment Segment [Member] | Level 1 [Member] | Recurring measurement [Member] | Equity securities: |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 13,609 |  | 11,130 |
Securities sold, not yet purchased, at fair value: |  |  |  |
Securities sold, not yet purchased, at fair value | 898 |  | 876 |
Investment Segment [Member] | Level 1 [Member] | Recurring measurement [Member] | Equity securities: | Communications |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 1,861 |  | 820 |
Securities sold, not yet purchased, at fair value: |  |  |  |
Securities sold, not yet purchased, at fair value | 9 |  | 0 |
Investment Segment [Member] | Level 1 [Member] | Recurring measurement [Member] | Equity securities: | Consumer, non-cyclical |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 3,719 |  | 3,344 |
Securities sold, not yet purchased, at fair value: |  |  |  |
Securities sold, not yet purchased, at fair value | 0 |  | 44 |
Investment Segment [Member] | Level 1 [Member] | Recurring measurement [Member] | Equity securities: | Consumer, cyclical |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 368 |  | 414 |
Securities sold, not yet purchased, at fair value: |  |  |  |
Securities sold, not yet purchased, at fair value | 880 |  | 787 |
Investment Segment [Member] | Level 1 [Member] | Recurring measurement [Member] | Equity securities: | Diversified |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 28 |  | 29 |
Investment Segment [Member] | Level 1 [Member] | Recurring measurement [Member] | Equity securities: | Energy |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 2,798 |  | 3,050 |
Investment Segment [Member] | Level 1 [Member] | Recurring measurement [Member] | Equity securities: | Financial |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 480 |  | 300 |
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 |
Investment Segment [Member] | Level 1 [Member] | Recurring measurement [Member] | Equity securities: | Technology |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 4,355 |  | 3,173 |
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 | 518 |  | 409 |
Derivative contracts, at fair value (asset) | 1 | [1] | 0 | [1]
Fair value of investment and derivative assets | 519 |  | 409 |
Securities sold, not yet purchased, at fair value: |  |  |  |
Derivative contracts at fair value (liability) | 820 | [2] | 639 | [2]
Fair value of derivative and other liabilities | 820 |  | 647 |
Investment Segment [Member] | Level 2 [Member] | Recurring measurement [Member] | Equity securities: |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 293 |  | 184 |
Securities sold, not yet purchased, at fair value: |  |  |  |
Securities sold, not yet purchased, at fair value | 0 |  | 8 |
Investment Segment [Member] | Level 2 [Member] | Recurring measurement [Member] | Equity securities: | Communications |  |  |  |
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: | Consumer, non-cyclical |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 0 |  | 178 |
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: | 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 | 293 |  | 0 |
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 |  | 6 |
Securities sold, not yet purchased, at fair value: |  |  |  |
Securities sold, not yet purchased, at fair value | 0 |  | 8 |
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] | Corporate debt: |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 47 |  | 45 |
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 |  | 11 |
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 | 31 |  | 29 |
Investment Segment [Member] | Level 2 [Member] | Recurring measurement [Member] | Mortgage-backed securities: | Financial |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 178 |  | 180 |
Investment Segment [Member] | Level 3 [Member] | Recurring measurement [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Investments | 286 |  | 287 |
Derivative contracts, at fair value (asset) | 0 | [1] | 0 | [1]
Fair value of investment and derivative assets | 286 |  | 287 |
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: | Communications |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 0 |  | 0 |
Securities sold, not yet purchased, at fair value: |  |  |  |
Securities sold, not yet purchased, at fair value | 0 |  |  |
Investment Segment [Member] | Level 3 [Member] | Recurring measurement [Member] | Equity securities: | Consumer, non-cyclical |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 0 |  | 0 |
Securities sold, not yet purchased, at fair value: |  |  |  |
Securities sold, not yet purchased, at fair value | 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 |  |  |
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 |  |  |
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] | Corporate debt: |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 286 |  | 287 |
Investment Segment [Member] | Level 3 [Member] | Recurring measurement [Member] | Corporate debt: | Consumer, cyclical |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 286 |  | 287 |
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 | 14,413 |  | 11,826 |
Derivative contracts, at fair value (asset) | 1 | [1] | 0 | [1]
Fair value of investment and derivative assets | 14,414 |  | 11,826 |
Securities sold, not yet purchased, at fair value: |  |  |  |
Derivative contracts at fair value (liability) | 820 | [2] | 639 | [2]
Fair value of derivative and other liabilities | 1,718 |  | 1,523 |
Investment Segment [Member] | Total fair value [Member] | Recurring measurement [Member] | Equity securities: |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 13,902 |  | 11,314 |
Securities sold, not yet purchased, at fair value: |  |  |  |
Securities sold, not yet purchased, at fair value | 898 |  | 884 |
Investment Segment [Member] | Total fair value [Member] | Recurring measurement [Member] | Equity securities: | Communications |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 1,861 |  | 820 |
Securities sold, not yet purchased, at fair value: |  |  |  |
Securities sold, not yet purchased, at fair value | 9 |  | 0 |
Investment Segment [Member] | Total fair value [Member] | Recurring measurement [Member] | Equity securities: | Consumer, non-cyclical |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 3,719 |  | 3,522 |
Securities sold, not yet purchased, at fair value: |  |  |  |
Securities sold, not yet purchased, at fair value | 0 |  | 44 |
Investment Segment [Member] | Total fair value [Member] | Recurring measurement [Member] | Equity securities: | Consumer, cyclical |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 368 |  | 414 |
Securities sold, not yet purchased, at fair value: |  |  |  |
Securities sold, not yet purchased, at fair value | 880 |  | 787 |
Investment Segment [Member] | Total fair value [Member] | Recurring measurement [Member] | Equity securities: | Diversified |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 28 |  | 29 |
Investment Segment [Member] | Total fair value [Member] | Recurring measurement [Member] | Equity securities: | Energy |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 3,091 |  | 3,050 |
Investment Segment [Member] | Total fair value [Member] | Recurring measurement [Member] | Equity securities: | Financial |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 480 |  | 300 |
Securities sold, not yet purchased, at fair value: |  |  |  |
Securities sold, not yet purchased, at fair value | 9 |  | 45 |
Investment Segment [Member] | Total fair value [Member] | Recurring measurement [Member] | Equity securities: | Funds |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 0 |  | 6 |
Securities sold, not yet purchased, at fair value: |  |  |  |
Securities sold, not yet purchased, at fair value | 0 |  | 8 |
Investment Segment [Member] | Total fair value [Member] | Recurring measurement [Member] | Equity securities: | Technology |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 4,355 |  | 3,173 |
Investment Segment [Member] | Total fair value [Member] | Recurring measurement [Member] | Corporate debt: |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 333 |  | 332 |
Investment Segment [Member] | Total fair value [Member] | Recurring measurement [Member] | Corporate debt: | Consumer, cyclical |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 286 |  | 287 |
Investment Segment [Member] | Total fair value [Member] | Recurring measurement [Member] | Corporate debt: | Financial |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 11 |  | 11 |
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 | 31 |  | 29 |
Investment Segment [Member] | Total fair value [Member] | Recurring measurement [Member] | Mortgage-backed securities: | Financial |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | $ 178 |  | $ 180 |
[1] | Included in other assets in our consolidated balance sheets.
[2] | Included in accrued expenses and other liabilities in our consolidated balance sheets.

X
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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
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