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Investments and Related Matters Other Segments (Details) - USD ($) $ in Millions | Mar. 31, 2016 | Dec. 31, 2015
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Schedule of Investments [Line Items] |  |
Investments | $ 10,026 | $ 15,351
Other Segments [Member] |  |
Schedule of Investments [Line Items] |  |
Investments | 755 | 798
Other Segments [Member] | Equity method investments |  |
Schedule of Investments [Line Items] |  |
Investments | 340 | 323
Other Segments [Member] | Other investments |  |
Schedule of Investments [Line Items] |  |
Investments | $ 415 | $ 475

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- Definition Sum of the carrying amounts as of the balance sheet date of all investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(h)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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