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Consolidated Statements of Equity (Parenthetical) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Statement of Stockholders' Equity [Abstract] |  |  |
Comprehensive income attributable to redeemable noncontrolling interests | $ 127 | $ 109 | $ 101

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- References No definition available. + Details
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