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Segment Information (Details) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2017 USD ($) segment revenue_line | Mar. 31, 2016 USD ($)
Segment Reporting Information |  |
Number of reportable segments | segment | 1 |
Number of revenue lines | revenue_line | 5 |
Number of operating segments | segment | 1 |
Total revenue | $ 2,381 | $ 2,276
Intersegment Eliminations |  |
Segment Reporting Information |  |
Total revenue | 0 | (2)
Commercial Risk Solutions | Operating Segments |  |
Segment Reporting Information |  |
Total revenue | 984 | 961
Reinsurance Solutions | Operating Segments |  |
Segment Reporting Information |  |
Total revenue | 371 | 371
Retirement Solutions | Operating Segments |  |
Segment Reporting Information |  |
Total revenue | 386 | 395
Health Solutions | Operating Segments |  |
Segment Reporting Information |  |
Total revenue | 372 | 292
Data & Analytic Services | Operating Segments |  |
Segment Reporting Information |  |
Total revenue | $ 268 | $ 259

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- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References No definition available. + Details
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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + 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 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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