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Revenue (Tables) | 3 Months Ended
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Mar. 31, 2018
Revenue from Contract with Customer [Abstract] |
Disaggregation of Revenue | Oliver Wyman typically bills its clients 30-60 days in arrears with payment due upon receipt of the invoice. Health brokerage and consulting services are components of both Marsh, which includes MMA, and Mercer, with approximately 70% of such revenues reported in Mercer. Health contracts typically involve a series of distinct services that are treated as a single performance obligation. Revenue for these services is recognized over time based on the amount of remuneration the Company expects to be entitled in exchange for these services. Payments for health brokerage and consulting services are typically paid monthly in arrears from carriers based on insured lives under the contract. The following schedule disaggregates various components of the Company's revenue:
|  | Three Months Ended March 31,
|  | 2018
Marsh: |  |
EMEA |  | $ | 643 |
Asia Pacific |  | 164 |
Latin America |  | 84 |
Total International |  | 891 |
U.S./Canada |  | 803 |
Total Marsh |  | 1,694 |
Guy Carpenter |  | 637 |
Subtotal |  | 2,331 |
Fiduciary interest income |  | 13 |
Total Risk and Insurance Services |  | $ | 2,344 |
Mercer: |  |
Defined Benefit Consulting & Administration |  | $ | 339 |
Investment Management & Related Services |  | 226 |
Total Wealth |  | 565 |
Health |  | 442 |
Career |  | 164 |
Total Mercer |  | 1,171 |
Oliver Wyman |  | 497 |
Total Consulting |  | $ | 1,668 |
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 |  | March 31, 2018
Contract Assets |  | $ | 128 |  |  | $ | 169 |
Contract Liabilities |  | $ | 583 |  |  | $ | 657 |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction | The revenue expected to be recognized in future periods during the non-cancellable term of existing contracts greater than one year that is related to performance obligations that are unsatisfied or partially satisfied at the end of the reporting period is approximately $24 million for Marsh, $575 million for Mercer and $8 million for Oliver Wyman. The Company expects revenue in 2019, 2020, 2021, 2022 and 2023 and beyond of $284 million, $155 million, $94 million, $47 million and $27 million, respectively, related to these performance obligations.

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- Definition Tabular disclosure of contract balances and changes in contract balances. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=82913847&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130545-203045 + Details
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- Definition Tabular disclosure of expected timing for satisfying remaining performance obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=84173487&loc=SL51747714-108306 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130556-203045 + Details
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