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Earnings Per Share - Reconciliation of the Numerators and Denominators of the Earnings Per Share Calculations (Details) - USD ($) shares in Millions, $ in Millions | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Earnings Per Share [Abstract] |  |
Net income attributable to the parent company | $ 98 | $ 108
Less: Redeemable noncontrolling interests adjustment to redemption value | 0 | 0
Net income available to common stockholders - Numerator diluted | 98 | 108
Net income available to common stockholders - Numerator basic | $ 98 | $ 108
Weighted-average common shares outstanding - Basic | 143.9 | 145.6
Employee compensation-related shares, including stock options | 0.9 | 1.9
Weighted-average common shares outstanding - Diluted | 144.8 | 147.5

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