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Earnings per Share - Reconciliation of Numerators and Denominators of the Earnings per Share Calculations (Details) - USD ($)
shares in Millions, $ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Earnings Per Share [Abstract]      
Income from continuing operations $ 116 $ 653 $ 176
Less: Noncontrolling interests net income 10 13 21
Less: Redeemable noncontrolling interests net loss (5)
Less: Redeemable noncontrolling interests adjustment to redemption value (6)    
Income from continuing operations available to common stockholders - Numerator basic and diluted 105 640 155
Net income available to common stockholders - Numerator basic and diluted $ 105 $ 640 $ 159
Weighted-average shares outstanding - Denominator basic 145.1 146.0 159.0
Employee compensation-related shares, including stock options 1.8 0.8 1.0
Weighted-average shares outstanding - Denominator diluted 146.9 146.8 160.0