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Investments and Related Matters Other Segments (Details) - USD ($) $ in Millions | Jun. 30, 2016 | Dec. 31, 2015
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Schedule of Investments [Line Items] |  |
Investments | $ 9,875 | $ 15,351
Other Segments [Member] |  |
Schedule of Investments [Line Items] |  |
Investments | 658 | 798
Other Segments [Member] | Equity method investments |  |
Schedule of Investments [Line Items] |  |
Investments | 293 | 323
Other Segments [Member] | Other investments |  |
Schedule of Investments [Line Items] |  |
Investments | $ 365 | $ 475

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