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Segment Information | 9 Months Ended
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Sep. 30, 2016
Segment Reporting [Abstract] |
Segment Information | Segment Information The Company has two reportable segments: Risk Solutions and HR Solutions. Unallocated income and expenses, when combined with the operating segments and after the elimination of intersegment revenues and expenses, equal the amounts in the Condensed Consolidated Financial Statements. Reportable operating segments have been determined using a management approach, which is consistent with the basis and manner in which Aon's chief operating decision-maker ("CODM") uses financial information for the purposes of allocating resources and evaluating performance. The CODM assesses performance based on operating income and generally accounts for inter-segment revenue as if the revenue were from third parties and at what management believes are current market prices. The Company does not present net assets by segment as this information is not reviewed by the CODM. Risk Solutions acts as an advisor and insurance and reinsurance broker, helping clients manage their risks, via consultation, as well as negotiation and placement of insurance risk with insurance carriers through Aon's global distribution network. HR Solutions partners with organizations to solve their most complex benefits, talent and related financial challenges, and improve business performance by designing, implementing, communicating and administering a wide range of human capital, retirement, investment management, health care, compensation and talent management strategies. Aon's total revenue is as follows (in millions):
| Three months ended September 30, |  | Nine months ended September 30,
| 2016 |  | 2015 |  | 2016 |  | 2015
Risk Solutions | $ | 1,715 |  |  | $ | 1,689 |  |  | $ | 5,434 |  |  | $ | 5,417 |
HR Solutions | 1,041 |  |  | 1,064 |  |  | 2,902 |  |  | 3,013 |
Intersegment eliminations | (10 | ) |  | (11 | ) |  | (32 | ) |  | (36 | )
Total revenue | $ | 2,746 |  |  | $ | 2,742 |  |  | $ | 8,304 |  |  | $ | 8,394 |
Commissions, fees and other revenues by product are as follows (in millions):
| Three months ended September 30, |  | Nine months ended September 30,
| 2016 |  | 2015 |  | 2016 |  | 2015
Retail brokerage | $ | 1,377 |  |  | $ | 1,352 |  |  | $ | 4,380 |  |  | $ | 4,363 |
Reinsurance brokerage | 332 |  |  | 331 |  |  | 1,038 |  |  | 1,038 |
Total Risk Solutions Segment | 1,709 |  |  | 1,683 |  |  | 5,418 |  |  | 5,401 |
Consulting services | 459 |  |  | 460 |  |  | 1,216 |  |  | 1,222 |
Outsourcing | 593 |  |  | 616 |  |  | 1,703 |  |  | 1,819 |
Intrasegment | (11 | ) |  | (12 | ) |  | (17 | ) |  | (28 | )
Total HR Solutions Segment | 1,041 |  |  | 1,064 |  |  | 2,902 |  |  | 3,013 |
Intersegment | (10 | ) |  | (11 | ) |  | (32 | ) |  | (36 | )
Total commissions, fees and other revenue | $ | 2,740 |  |  | $ | 2,736 |  |  | $ | 8,288 |  |  | $ | 8,378 |
Fiduciary investment income by segment is as follows (in millions):
| Three months ended September 30, |  | Nine months ended September 30,
| 2016 |  | 2015 |  | 2016 |  | 2015
Risk Solutions | $ | 6 |  |  | $ | 6 |  |  | $ | 16 |  |  | $ | 16 |
HR Solutions | — |  |  | — |  |  | — |  |  | — |
Total fiduciary investment income | $ | 6 |  |  | $ | 6 |  |  | $ | 16 |  |  | $ | 16 |
A reconciliation of segment operating income before tax to income before income taxes is as follows (in millions):
| Three months ended September 30, |  | Nine months ended September 30,
| 2016 |  | 2015 |  | 2016 |  | 2015
Risk Solutions | $ | 330 |  |  | $ | 324 |  |  | $ | 1,132 |  |  | $ | 1,015 |
HR Solutions | 134 |  |  | 134 |  |  | 276 |  |  | 249 |
Segment income before income taxes | 464 |  |  | 458 |  |  | 1,408 |  |  | 1,264 |
Unallocated expenses | (42 | ) |  | (45 | ) |  | (131 | ) |  | (133 | )
Interest income | 1 |  |  | 3 |  |  | 6 |  |  | 10 |
Interest expense | (70 | ) |  | (72 | ) |  | (212 | ) |  | (205 | )
Other income | 9 |  |  | 8 |  |  | 27 |  |  | 51 |
Income before income taxes | $ | 362 |  |  | $ | 352 |  |  | $ | 1,098 |  |  | $ | 987 |
Unallocated expenses include administrative or other costs not attributable to the reportable segments, such as corporate governance costs. Interest income represents income earned primarily on operating cash balances and certain income producing securities. Interest expense represents the cost of debt obligations. Other income consists of equity earnings, realized gains or losses on the sale of investments, gains or losses on the disposal of businesses, gains or losses on derivatives, and gains or losses on foreign currency transactions.

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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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8981-108599 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e9038-108599 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8971-108599 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8595-108599 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8380-108599 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8933-108599 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8844-108599 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 35 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8984-108599 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 40 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e9031-108599 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e9054-108599 Reference 11: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8538-108599 Reference 12: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 29 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8864-108599 Reference 13: 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 14: 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 + Details
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