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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, 2016
Dec. 31, 2015
Dec. 31, 2014
Earnings Per Share [Abstract]      
Income from continuing operations $ 653 $ 176 $ 343
Less: Noncontrolling interests net income 13 21 9
Less: Preferred stock dividend requirements 7
Income from continuing operations available to common stockholders - Numerator basic 640 155 327
Numerator diluted 640 155 334
Net income available to common stockholders 640 159 312
Numerator diluted $ 640 $ 159 $ 319
Weighted-average number of shares outstanding - Denominator basic 146.0 159.0 158.0
Employee compensation-related shares, including stock options 0.8 1.0 1.2
Conversion of preferred stock 14.3
Denominator diluted 146.8 160.0 173.5