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Investments and Related Matters Investment Segment (Details) - Investment Segment [Member] - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Schedule of Investments [Line Items] |  |  |
Portion of trading (losses) gains that relates to trading securities still held at balance sheet date | $ (2,200) | $ (557) | $ 2,700
Fair value of equity method investment under fair value option | 0 | 1 |
Equity Method Investments [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Fair value option, recorded gains (losses) | $ 1 | $ 1 | $ 140

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