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Segment Information (Tables) | 3 Months Ended
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Mar. 31, 2018
Segment Reporting [Abstract] |
Selected Information And Details For MMC's Operating Segments | Selected information about the Company’s operating segments for the three-month period ended March 31, 2018 and 2017 are as follows:
| Three Months Ended March 31,
(In millions) | Revenue |  | Operating Income (Loss)
2018– |  |  |
Risk and Insurance Services | $ | 2,344 |  | (a) | $ | 716 |
Consulting | 1,668 |  | (b) | 247 |
Total Operating Segments | 4,012 |  |  | 963 |
Corporate / Eliminations | (12 | ) |  | (55 | )
Total Consolidated | $ | 4,000 |  |  | $ | 908 |
2017– |  |  |
Risk and Insurance Services | $ | 1,989 |  | (a) | $ | 568 |
Consulting | 1,526 |  | (b) | 225 |
Total Operating Segments | 3,515 |  |  | 793 |
Corporate / Eliminations | (12 | ) |  | (44 | )
Total Consolidated | $ | 3,503 |  |  | $ | 749 |
(a) Includes inter-segment revenue of $1 million in 2018, interest income on fiduciary funds of $13 million and $8 million in 2018 and 2017, respectively, and equity method (loss) income of $(1) million and $2 million in 2018 and 2017, respectively. (b) Includes inter-segment revenue of $11 million and $12 million in 2018 and 2017, respectively, interest income on fiduciary funds of $1 million in both 2018 and in 2017, and equity method income of $3 million in 2018 and $4 million in 2017, respectively.
Details of Operating Segment Revenue | Details of operating segment revenue for the three-month period ended March 31, 2018 and 2017 are as follows:
| Three Months Ended March 31,
(In millions) | 2018 |  |  | 2017 |
Risk and Insurance Services |  |  |
Marsh | $ | 1,703 |  |  | $ | 1,602 |
Guy Carpenter | 641 |  |  | 387 |
Total Risk and Insurance Services | 2,344 |  |  | 1,989 |
Consulting |  |  |
Mercer | 1,171 |  |  | 1,077 |
Oliver Wyman Group | 497 |  |  | 449 |
Total Consulting | 1,668 |  |  | 1,526 |
Total Operating Segments | 4,012 |  |  | 3,515 |
Corporate / Eliminations | (12 | ) |  | (12 | )
Total | $ | 4,000 |  |  | $ | 3,503 |

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- Definition Tabular disclosure of all significant reconciling items in the reconciliation of total revenues from reportable segments to the entity's consolidated revenues. + 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 (a) -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8906-108599 + Details
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- Definition Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8906-108599 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8813-108599 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8721-108599 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8736-108599 + Details
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