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Revenue (Tables) | 6 Months Ended
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Jun. 30, 2018
Revenue from Contract with Customer [Abstract] |
Disaggregation of Revenue | The following schedule disaggregates various components of the Company's revenue:
|  | Three Months Ended June 30, |  | Six Months Ended June 30,
|  | 2018 |  | 2018
Marsh: |  |  |  |
EMEA |  | $ | 526 |  |  | $ | 1,169 |
Asia Pacific |  | 183 |  |  | 347 |
Latin America |  | 99 |  |  | 183 |
Total International |  | 808 |  |  | 1,699 |
U.S./Canada |  | 941 |  |  | 1,744 |
Total Marsh |  | 1,749 |  |  | 3,443 |
Guy Carpenter |  | 332 |  |  | 969 |
Subtotal |  | 2,081 |  |  | 4,412 |
Fiduciary interest income |  | 15 |  |  | 28 |
Total Risk and Insurance Services |  | $ | 2,096 |  |  | $ | 4,440 |
Mercer: |  |  |  |
Defined Benefit Consulting & Administration |  | $ | 320 |  |  | $ | 659 |
Investment Management & Related Services |  | 232 |  |  | 458 |
Total Wealth |  | 552 |  |  | 1,117 |
Health |  | 429 |  |  | 871 |
Career |  | 177 |  |  | 341 |
Total Mercer |  | 1,158 |  |  | 2,329 |
Oliver Wyman |  | 492 |  |  | 989 |
Total Consulting |  | $ | 1,650 |  |  | $ | 3,318 |
Contract with Customer, Asset and Liability | The following schedule provides contract assets and contract liabilities information from contracts with customers.
(In millions) |  | January 1, 2018 |  | June 30, 2018
Contract Assets |  | $ | 128 |  |  | $ | 178 |
Contract Liabilities |  | $ | 583 |  |  | $ | 647 |

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- Definition Tabular disclosure of contract balances and changes in contract balances. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130551-203045 + Details
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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045 + Details
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