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Earnings per Share (Tables) | 12 Months Ended
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Dec. 31, 2017
Earnings Per Share [Abstract] |
Reconciliation of Numerators and Denominators of Earnings Per Share Calculations [Table Text Block] | Reconciliation of the numerators and denominators of the earnings per share calculations —
| 2017 |  | 2016 |  | 2015
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 |
Denominator: |  |  |  |  |
Weighted-average shares outstanding - Basic | 145.1 |  |  | 146.0 |  |  | 159.0 |
Employee compensation-related shares, including stock options | 1.8 |  |  | 0.8 |  |  | 1.0 |
Weighted-average shares outstanding - Diluted | 146.9 |  |  | 146.8 |  |  | 160.0 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + 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 + Details
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