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Segment Information (Tables) | 6 Months Ended
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Jun. 30, 2017
Segment Reporting [Abstract] |
Schedule of reconciliation of segment income before tax to income from continuing operations before income taxes | Revenue from continuing operations for each of the Company’s principal product and service lines is as follows (in millions):
| Three months ended June 30 |  | Six months ended June 30
| 2017 |  | 2016 |  | 2017 |  | 2016
Commercial Risk Solutions | $ | 1,042 |  |  | $ | 990 |  |  | $ | 2,026 |  |  | $ | 1,951 |
Reinsurance Solutions | 344 |  |  | 332 |  |  | 715 |  |  | 703 |
Retirement Solutions | 389 |  |  | 405 |  |  | 775 |  |  | 800 |
Health Solutions | 312 |  |  | 281 |  |  | 684 |  |  | 573 |
Data & Analytic Services | 285 |  |  | 275 |  |  | 553 |  |  | 534 |
Elimination | (4 | ) |  | (1 | ) |  | (4 | ) |  | (3 | )
Total revenue | 2,368 |  |  | 2,282 |  |  | 4,749 |  |  | 4,558 |

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- Definition Tabular disclosure of the reconciliation of profit (loss) from reportable segments to the consolidated income (loss) before income tax expense (benefit) and discontinued operations. Includes, but is not limited to, reconciliation after income tax if income tax is allocated to the reportable segment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 31 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8924-108599 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8906-108599 + Details
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