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Equity (Changes in Noncontrolling Interests) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Parent [Member] |  |  |
Subsidiary or Equity Method Investee [Line Items] |  |  |
(Purchase) / sale of subsidiary shares from noncontrolling interest | $ 8 | $ (12) | $ 71

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Decrease/ Increase related to (Purchase) / sale of subsidiary shares from noncontrolling interest + References No definition available. + Details
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- Details
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