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Investments and Related Matters Investment Segment (Details) (Investment Segment [Member], USD $) In Millions, unless otherwise specified |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Dec. 31, 2012 | Sep. 30, 2013 Equity Method Investments [Member] | Sep. 30, 2012 Equity Method Investments [Member] | Sep. 30, 2013 Equity Method Investments [Member] | Sep. 30, 2012 Equity Method Investments [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Fair value of equity method investment under fair value option | $ 1 |  |  |  |
Fair value option, recorded gains (losses) |  | $ 78 | $ 193 | $ 140 | $ 360

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- Definition Fair value portion of investments accounted under the equity method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 25 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6903542&loc=d3e32014-111567 + Details
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- Definition For each line item in the statement of financial position, the amounts of gains and losses from fair value changes included in earnings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14172-108612 + Details
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