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Segment Information (Tables) | 9 Months Ended
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Sep. 30, 2015
Segment Reporting [Abstract] |
Schedule of total revenue by business segments | Aon's total revenue is as follows (in millions):
| Three months ended September 30, |  | Nine months ended September 30,
| 2015 |  | 2014 |  | 2015 |  | 2014
Risk Solutions | $ | 1,689 |  |  | $ | 1,836 |  |  | $ | 5,417 |  |  | $ | 5,778 |
HR Solutions | 1,064 |  |  | 1,057 |  |  | 3,013 |  |  | 3,004 |
Intersegment eliminations | (11 | ) |  | (13 | ) |  | (36 | ) |  | (36 | )
Total revenue | $ | 2,742 |  |  | $ | 2,880 |  |  | $ | 8,394 |  |  | $ | 8,746 |
Schedule of commissions, fees and other revenues by products | Commissions, fees and other revenues by product are as follows (in millions):
| Three months ended September 30, |  | Nine months ended September 30,
| 2015 |  | 2014 |  | 2015 |  | 2014
Retail brokerage | $ | 1,352 |  |  | $ | 1,458 |  |  | $ | 4,363 |  |  | $ | 4,619 |
Reinsurance brokerage | 331 |  |  | 371 |  |  | 1,038 |  |  | 1,140 |
Total Risk Solutions Segment | 1,683 |  |  | 1,829 |  |  | 5,401 |  |  | 5,759 |
Consulting services | 460 |  |  | 466 |  |  | 1,222 |  |  | 1,245 |
Outsourcing | 616 |  |  | 604 |  |  | 1,819 |  |  | 1,788 |
Intrasegment | (12 | ) |  | (13 | ) |  | (28 | ) |  | (29 | )
Total HR Solutions Segment | 1,064 |  |  | 1,057 |  |  | 3,013 |  |  | 3,004 |
Intersegment | (11 | ) |  | (13 | ) |  | (36 | ) |  | (36 | )
Total commissions, fees and other revenue | $ | 2,736 |  |  | $ | 2,873 |  |  | $ | 8,378 |  |  | $ | 8,727 |
Schedule of fiduciary investment income by business segments | Fiduciary investment income by segment is as follows (in millions):
| Three months ended September 30, |  | Nine months ended September 30,
| 2015 |  | 2014 |  | 2015 |  | 2014
Risk Solutions | $ | 6 |  |  | $ | 7 |  |  | $ | 16 |  |  | $ | 19 |
HR Solutions | — |  |  | — |  |  | — |  |  | — |
Total fiduciary investment income | $ | 6 |  |  | $ | 7 |  |  | $ | 16 |  |  | $ | 19 |
Schedule of reconciliation of segment income before tax to income from continuing operations before income taxes | 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,
| 2015 |  | 2014 |  | 2015 |  | 2014
Risk Solutions | $ | 324 |  |  | $ | 343 |  |  | $ | 1,015 |  |  | $ | 1,205 |
HR Solutions | 134 |  |  | 113 |  |  | 249 |  |  | 249 |
Segment income before income taxes | 458 |  |  | 456 |  |  | 1,264 |  |  | 1,454 |
Unallocated expenses | (45 | ) |  | (39 | ) |  | (133 | ) |  | (123 | )
Interest income | 3 |  |  | 3 |  |  | 10 |  |  | 7 |
Interest expense | (72 | ) |  | (65 | ) |  | (205 | ) |  | (188 | )
Other income | 8 |  |  | 35 |  |  | 51 |  |  | 34 |
Income before income taxes | $ | 352 |  |  | $ | 390 |  |  | $ | 987 |  |  | $ | 1,184 |

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- Definition Tabular disclosure of all significant reconciling items in the reconciliation of total profit or loss from reportable segments, to the entity's consolidated income before income taxes, extraordinary items, and discontinued operations. + 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=51669610&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 (b) -URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8906-108599 + Details
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