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Investments and Related Matters Other Segments (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Schedule of Investments [Line Items]
Investments	$ 10,369	$ 9,881
Other segments
Schedule of Investments [Line Items]
Investments	837	668
Equity method investments | Other segments
Schedule of Investments [Line Items]
Investments	430	302
Other investments | Other segments
Schedule of Investments [Line Items]
Investments	$ 407	$ 366

X

- 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

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- Definition

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+ References

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