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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
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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

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- Definition Amount Of Income (Loss) From Continuing Operations After Deduction Of Those Portions Of Income Or Loss From Continuing Operations That Are Allocable To Noncontrolling Interests And After Preferred Stock Dividend Requirements. + References No definition available. + Details
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- Definition The impact on the calculation of earnings per share from the adjustment of the redemption value of redeemable noncontrolling interests to the floor that reflects a redemption value in excess of fair value. + References No definition available. + Details
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- Definition Amount after tax of income (loss) from continuing operations including portion attributable to the noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=96868048&loc=SL4569616-111683 + Details
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- Definition Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 28A -URI http://asc.fasb.org/extlink&oid=96947427&loc=d3e1500-109256 + Details
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- Definition Amount of Net Income (Loss) attributable to redeemable noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.19) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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- Definition The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=96947427&loc=d3e1505-109256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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