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Investments and Related Matters Narrative (Details) (USD $) In Millions, except Share data, unless otherwise specified |  | 3 Months Ended |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | --- | ---
Jun. 30, 2012 Investment Segment [Member] | Mar. 31, 2011 Icahn Fund Ltd. [Member] | Jun. 30, 2012 Hain [Member] Investment Segment [Member] | Jun. 30, 2012 MGM [Member] Investment Segment [Member] | Jun. 30, 2012 Equity Method Investments [Member] Investment Segment [Member] | Jun. 30, 2011 Equity Method Investments [Member] Investment Segment [Member] | Jun. 30, 2012 Equity Method Investments [Member] Investment Segment [Member] | Jun. 30, 2011 Equity Method Investments [Member] Investment Segment [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |
Fair value of equity method investment under fair value option | $ 746 |  |  |  |  |  |  |
Fair value option, recorded gains |  |  |  |  | 46 | 14 | 167 | 21
Investment Owned, Balance, Shares |  |  | 7,130,563 | 17,174,706 |  |  |  |
Fair value option investment ownership percentage |  |  | 0.00% | 0.00% |  |  |  |
Liabilities, decrease from deconsolidation |  | 146 |  |  |  |  |  |
Increased equity attributable to non-controlling interests |  | $ 146 |  |  |  |  |  |

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