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Segment Information | 9 Months Ended
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Sep. 30, 2021
Segment Reporting [Abstract] |
Segment Information | Segment Information The Company is organized based on the types of services provided. Under this structure, the Company’s segments are: •Risk and Insurance Services, comprising insurance services (Marsh) and reinsurance services (Guy Carpenter); and •Consulting, comprising Mercer and Oliver Wyman Group. The accounting policies of the segments are the same as those used for the consolidated financial statements described in Note 1 to the Company’s 2020 Form 10-K. Segment performance is evaluated based on segment operating income, which includes directly related expenses, and charges or credits related to integration and restructuring but not the Company’s corporate-level expenses. Revenues are attributed to geographic areas on the basis of where the services are performed. Selected information about the Company’s operating segments for the three and nine month periods ended September 30, 2021 and 2020 are as follows:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
(In millions) | Revenue |  | Operating Income (Loss) |  | Revenue |  | Operating Income (Loss)
2021– |  |  |  |  |  |  |
Risk and Insurance Services | $ | 2,670 |  | (a) | $ | 403 |  |  | $ | 9,036 |  | (c) | $ | 2,413 |
Consulting | 1,925 |  | (b) | 404 |  |  | 5,690 |  | (d) | 1,109 |
Total Operating Segments | 4,595 |  |  | 807 |  |  | 14,726 |  |  | 3,522 |
Corporate/Eliminations | (12) |  |  | (67) |  |  | (43) |  |  | (196) |
Total Consolidated | $ | 4,583 |  |  | $ | 740 |  |  | $ | 14,683 |  |  | $ | 3,326 |
2020– |  |  |  |  |  |  |
Risk and Insurance Services | $ | 2,291 |  | (a) | $ | 333 |  |  | $ | 7,805 |  | (c) | $ | 1,883 |
Consulting | 1,696 |  | (b) | 278 |  |  | 5,074 |  | (d) | 815 |
Total Operating Segments | 3,987 |  |  | 611 |  |  | 12,879 |  |  | 2,698 |
Corporate/Eliminations | (19) |  |  | (71) |  |  | (71) |  |  | (203) |
Total Consolidated | $ | 3,968 |  |  | $ | 540 |  |  | $ | 12,808 |  |  | $ | 2,495 |
(a) Includes interest income on fiduciary funds of $4 million and $8 million in 2021 and 2020, respectively, and equity method income of $8 million in 2021 and equity method loss of $6 million in 2020. (b) Includes inter-segment revenue of $11 million and $19 million in 2021 and 2020, respectively. (c) Includes inter-segment revenue of $5 million for both 2021 and 2020, interest income on fiduciary funds of $12 million and $40 million in 2021 and 2020, respectively, and equity method income of $25 million and $7 million in 2021 and 2020, respectively. (d) Includes inter-segment revenue of $38 million and $66 million in 2021 and 2020, respectively, and equity method income of $4 million in 2020 and none in 2021. Details of operating segment revenue for the three and nine month periods ended September 30, 2021 and 2020 are as follows:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
(In millions) | 2021 |  | 2020 |  | 2021 |  | 2020
Risk and Insurance Services |  |  |  |  |  |  |
Marsh | $ | 2,355 |  |  | $ | 2,015 |  |  | $ | 7,336 |  |  | $ | 6,259 |
Guy Carpenter | 315 |  |  | 276 |  |  | 1,700 |  |  | 1,546 |
Total Risk and Insurance Services | 2,670 |  |  | 2,291 |  |  | 9,036 |  |  | 7,805 |
Consulting |  |  |  |  |  |  |
Mercer | 1,315 |  |  | 1,216 |  |  | 3,877 |  |  | 3,616 |
Oliver Wyman Group | 610 |  |  | 480 |  |  | 1,813 |  |  | 1,458 |
Total Consulting | 1,925 |  |  | 1,696 |  |  | 5,690 |  |  | 5,074 |
Total Operating Segments | 4,595 |  |  | 3,987 |  |  | 14,726 |  |  | 12,879 |
Corporate/Eliminations | (12) |  |  | (19) |  |  | (43) |  |  | (71) |
Total | $ | 4,583 |  |  | $ | 3,968 |  |  | $ | 14,683 |  |  | $ | 12,808 |

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- Definition The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 31 -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8924-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8981-108599 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8721-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 40 -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e9031-108599 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8933-108599 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8933-108599 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8844-108599 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e9038-108599 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8933-108599 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8736-108599 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e9054-108599 Reference 12: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8657-108599 Reference 13: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8721-108599 Reference 14: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -URI http://asc.fasb.org/topic&trid=2134510 + Details
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