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Fair Value Measurements Investment Fair Value (Details) (USD $) In Millions, unless otherwise specified | Jun. 30, 2012 | Dec. 31, 2011
--- | --- | ---
Investments [Abstract] |  |  |  |
Investments | $ 5,386 |  | $ 8,938 |
Securities sold, not yet purchased, at fair value: [Abstract] |  |  |  |
Securities sold, not yet purchased, at fair value | 548 |  | 4,476 |
Investment Segment [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Investments | 4,982 |  | 8,448 |
Securities sold, not yet purchased, at fair value: [Abstract] |  |  |  |
Securities sold, not yet purchased, at fair value | 548 |  | 4,476 |
Investment Segment [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Investments | 3,648 |  | 7,119 |
Derivative contracts, Assets at fair value | 0 | [1] | 0 | [1]
Assets, Fair Value Disclosure | 3,648 |  | 7,119 |
Securities sold, not yet purchased, at fair value: [Abstract] |  |  |  |
Derivative contracts, Liabilities at fair value | 0 | [2] | 0 | [2]
Liabilities, Fair Value | 340 |  | 4,466 |
Investment Segment [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Equity securities [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 3,648 |  | 7,119 |
Securities sold, not yet purchased, at fair value: [Abstract] |  |  |  |
Securities sold, not yet purchased, at fair value | 340 |  | 4,466 |
Investment Segment [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Equity securities [Member] | Basic materials [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 81 |  | 128 |
Investment Segment [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Equity securities [Member] | Communications [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 318 |  | 2,593 |
Investment Segment [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Equity securities [Member] | Consumer, non-cyclical [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 1,523 |  | 1,778 |
Investment Segment [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Equity securities [Member] | Consumer, cyclical [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 371 |  | 376 |
Securities sold, not yet purchased, at fair value: [Abstract] |  |  |  |
Securities sold, not yet purchased, at fair value | 294 |  | 0 |
Investment Segment [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Equity securities [Member] | Energy Segment [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 824 |  | 1,644 |
Securities sold, not yet purchased, at fair value: [Abstract] |  |  |  |
Securities sold, not yet purchased, at fair value | 46 |  | 0 |
Investment Segment [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Equity securities [Member] | Financial [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 228 |  | 263 |
Investment Segment [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Equity securities [Member] | Funds [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 0 |  | 0 |
Securities sold, not yet purchased, at fair value: [Abstract] |  |  |  |
Securities sold, not yet purchased, at fair value | 0 |  | 4,466 |
Investment Segment [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Equity securities [Member] | Industrial [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 0 |  | 0 |
Investment Segment [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Equity securities [Member] | Technology [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 253 |  | 254 |
Investment Segment [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Equity securities [Member] | Utilities [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 50 |  | 83 |
Investment Segment [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Corporate debt [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 0 |  | 0 |
Investment Segment [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Corporate debt [Member] | Communications [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 0 |  | 0 |
Investment Segment [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Corporate debt [Member] | Consumer, cyclical [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 0 |  | 0 |
Investment Segment [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Corporate debt [Member] | Financial [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 0 |  | 0 |
Investment Segment [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Corporate debt [Member] | Sovereign debt [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 0 |  | 0 |
Investment Segment [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Corporate debt [Member] | Utilities [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 0 |  | 0 |
Investment Segment [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Mortgage-backed securities [Member] | Financial [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 0 |  | 0 |
Investment Segment [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Investments | 1,047 |  | 1,040 |
Derivative contracts, Assets at fair value | 0 | [1] | 3 | [1]
Assets, Fair Value Disclosure | 1,047 |  | 1,043 |
Securities sold, not yet purchased, at fair value: [Abstract] |  |  |  |
Derivative contracts, Liabilities at fair value | 92 | [2] | 42 | [2]
Liabilities, Fair Value | 300 |  | 52 |
Investment Segment [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Equity securities [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 759 |  | 486 |
Securities sold, not yet purchased, at fair value: [Abstract] |  |  |  |
Securities sold, not yet purchased, at fair value | 208 |  | 10 |
Investment Segment [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Equity securities [Member] | Basic materials [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 0 |  | 0 |
Investment Segment [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Equity securities [Member] | Communications [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 13 |  | 0 |
Investment Segment [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Equity securities [Member] | Consumer, non-cyclical [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 0 |  | 26 |
Investment Segment [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Equity securities [Member] | Consumer, cyclical [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 433 |  | 378 |
Securities sold, not yet purchased, at fair value: [Abstract] |  |  |  |
Securities sold, not yet purchased, at fair value | 0 |  | 0 |
Investment Segment [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Equity securities [Member] | Energy Segment [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 57 |  | 29 |
Securities sold, not yet purchased, at fair value: [Abstract] |  |  |  |
Securities sold, not yet purchased, at fair value | 0 |  | 0 |
Investment Segment [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Equity securities [Member] | Financial [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 0 |  | 0 |
Investment Segment [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Equity securities [Member] | Funds [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 216 |  | 0 |
Securities sold, not yet purchased, at fair value: [Abstract] |  |  |  |
Securities sold, not yet purchased, at fair value | 208 |  | 10 |
Investment Segment [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Equity securities [Member] | Industrial [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 0 |  | 32 |
Investment Segment [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Equity securities [Member] | Technology [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 0 |  | 0 |
Investment Segment [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Equity securities [Member] | Utilities [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 40 |  | 21 |
Investment Segment [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Corporate debt [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 124 |  | 387 |
Investment Segment [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Corporate debt [Member] | Communications [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 0 |  | 84 |
Investment Segment [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Corporate debt [Member] | Consumer, cyclical [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 0 |  | 150 |
Investment Segment [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Corporate debt [Member] | Financial [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 94 |  | 109 |
Investment Segment [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Corporate debt [Member] | Sovereign debt [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 3 |  | 10 |
Investment Segment [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Corporate debt [Member] | Utilities [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 27 |  | 34 |
Investment Segment [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Mortgage-backed securities [Member] | Financial [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 164 |  | 167 |
Investment Segment [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Investments | 287 |  | 289 |
Derivative contracts, Assets at fair value | 0 | [1] | 0 | [1]
Assets, Fair Value Disclosure | 287 |  | 289 |
Securities sold, not yet purchased, at fair value: [Abstract] |  |  |  |
Derivative contracts, Liabilities at fair value | 0 | [2] | 0 | [2]
Liabilities, Fair Value | 0 |  | 0 |
Investment Segment [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Equity securities [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 0 |  | 0 |
Securities sold, not yet purchased, at fair value: [Abstract] |  |  |  |
Securities sold, not yet purchased, at fair value | 0 |  | 0 |
Investment Segment [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Equity securities [Member] | Basic materials [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 0 |  | 0 |
Investment Segment [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Equity securities [Member] | Communications [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 0 |  | 0 |
Investment Segment [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Equity securities [Member] | Consumer, non-cyclical [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 0 |  | 0 |
Investment Segment [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Equity securities [Member] | Consumer, cyclical [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 0 |  | 0 |
Securities sold, not yet purchased, at fair value: [Abstract] |  |  |  |
Securities sold, not yet purchased, at fair value | 0 |  | 0 |
Investment Segment [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Equity securities [Member] | Energy Segment [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 0 |  | 0 |
Securities sold, not yet purchased, at fair value: [Abstract] |  |  |  |
Securities sold, not yet purchased, at fair value | 0 |  | 0 |
Investment Segment [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Equity securities [Member] | Financial [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 0 |  | 0 |
Investment Segment [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Equity securities [Member] | Funds [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 0 |  | 0 |
Securities sold, not yet purchased, at fair value: [Abstract] |  |  |  |
Securities sold, not yet purchased, at fair value | 0 |  | 0 |
Investment Segment [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Equity securities [Member] | Industrial [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 0 |  | 0 |
Investment Segment [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Equity securities [Member] | Technology [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 0 |  | 0 |
Investment Segment [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Equity securities [Member] | Utilities [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 0 |  | 0 |
Investment Segment [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Corporate debt [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 287 |  | 289 |
Investment Segment [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Corporate debt [Member] | Communications [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 0 |  | 0 |
Investment Segment [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Corporate debt [Member] | Consumer, cyclical [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 287 |  | 289 |
Investment Segment [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Corporate debt [Member] | Financial [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 0 |  | 0 |
Investment Segment [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Corporate debt [Member] | Sovereign debt [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 0 |  | 0 |
Investment Segment [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Corporate debt [Member] | Utilities [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 0 |  | 0 |
Investment Segment [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Mortgage-backed securities [Member] | Financial [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 0 |  | 0 |
Investment Segment [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Investments | 4,982 |  | 8,448 |
Derivative contracts, Assets at fair value | 0 | [1] | 3 | [1]
Assets, Fair Value Disclosure | 4,982 |  | 8,451 |
Securities sold, not yet purchased, at fair value: [Abstract] |  |  |  |
Derivative contracts, Liabilities at fair value | 92 | [2] | 42 | [2]
Liabilities, Fair Value | 640 |  | 4,518 |
Investment Segment [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value, Measurements, Recurring [Member] | Equity securities [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 4,407 |  | 7,605 |
Securities sold, not yet purchased, at fair value: [Abstract] |  |  |  |
Securities sold, not yet purchased, at fair value | 548 |  | 4,476 |
Investment Segment [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value, Measurements, Recurring [Member] | Equity securities [Member] | Basic materials [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 81 |  | 128 |
Investment Segment [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value, Measurements, Recurring [Member] | Equity securities [Member] | Communications [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 331 |  | 2,593 |
Investment Segment [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value, Measurements, Recurring [Member] | Equity securities [Member] | Consumer, non-cyclical [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 1,523 |  | 1,804 |
Investment Segment [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value, Measurements, Recurring [Member] | Equity securities [Member] | Consumer, cyclical [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 804 |  | 754 |
Securities sold, not yet purchased, at fair value: [Abstract] |  |  |  |
Securities sold, not yet purchased, at fair value | 294 |  | 0 |
Investment Segment [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value, Measurements, Recurring [Member] | Equity securities [Member] | Energy Segment [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 881 |  | 1,673 |
Securities sold, not yet purchased, at fair value: [Abstract] |  |  |  |
Securities sold, not yet purchased, at fair value | 46 |  | 0 |
Investment Segment [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value, Measurements, Recurring [Member] | Equity securities [Member] | Financial [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 228 |  | 263 |
Investment Segment [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value, Measurements, Recurring [Member] | Equity securities [Member] | Funds [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 216 |  | 0 |
Securities sold, not yet purchased, at fair value: [Abstract] |  |  |  |
Securities sold, not yet purchased, at fair value | 208 |  | 4,476 |
Investment Segment [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value, Measurements, Recurring [Member] | Equity securities [Member] | Industrial [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 0 |  | 32 |
Investment Segment [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value, Measurements, Recurring [Member] | Equity securities [Member] | Technology [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 253 |  | 254 |
Investment Segment [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value, Measurements, Recurring [Member] | Equity securities [Member] | Utilities [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 90 |  | 104 |
Investment Segment [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value, Measurements, Recurring [Member] | Corporate debt [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 411 |  | 676 |
Investment Segment [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value, Measurements, Recurring [Member] | Corporate debt [Member] | Communications [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 0 |  | 84 |
Investment Segment [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value, Measurements, Recurring [Member] | Corporate debt [Member] | Consumer, cyclical [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 287 |  | 439 |
Investment Segment [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value, Measurements, Recurring [Member] | Corporate debt [Member] | Financial [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 94 |  | 109 |
Investment Segment [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value, Measurements, Recurring [Member] | Corporate debt [Member] | Sovereign debt [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 3 |  | 10 |
Investment Segment [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value, Measurements, Recurring [Member] | Corporate debt [Member] | Utilities [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 27 |  | 34 |
Investment Segment [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value, Measurements, Recurring [Member] | Mortgage-backed securities [Member] | Financial [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | $ 164 |  | $ 167 |
[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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fair values as of the balance sheet date of all assets resulting from contracts that meet the criteria of being accounted for as derivative instruments, net of the effects of master netting arrangements. + References Reference 1: 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FIN39-1 -Paragraph 10A, 10B -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 -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13433-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 4, 17 -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 -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 6: 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=7491637&loc=d3e13495-108611 + Details
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- Definition Fair values as of the balance sheet date of all liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments, net of the effects of master netting arrangements. + References Reference 1: 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FIN39-1 -Paragraph 10A, 10B -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 -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13433-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 4, 17 -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 -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 6: 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=7491637&loc=d3e13495-108611 + Details
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- Definition This element represents the aggregate of the liabilities 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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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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 element represents securities sold but not yet purchased, that is, sold short, which leads to a liability for the obligation to purchase said securities at a future date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 405 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6957929&loc=d3e63862-112815 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Audit and Accounting Guide (AAG) -Number AAG-BRD -Paragraph 38, 39 -IssueDate 2006-05-01 -Chapter 4 -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. + Details
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