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Segment Information (Tables) | 12 Months Ended
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Dec. 31, 2016
Segment Reporting [Abstract] |
Schedule of Segment Reporting Information, by Segment | Aon’s total revenue is as follows (in millions):
Years ended December 31 | 2016 |  | 2015 |  | 2014
Risk Solutions | $ | 7,485 |  |  | $ | 7,426 |  |  | $ | 7,834 |
HR Solutions | 4,183 |  |  | 4,303 |  |  | 4,264 |
Intersegment eliminations | (41 | ) |  | (47 | ) |  | (53 | )
Total revenue | $ | 11,627 |  |  | $ | 11,682 |  |  | $ | 12,045 |
Fiduciary investment income by segment is as follows (in millions):
Years ended December 31 | 2016 |  | 2015 |  | 2014
Risk Solutions | $ | 22 |  |  | $ | 21 |  |  | $ | 26 |
HR Solutions | — |  |  | — |  |  | — |
Total fiduciary investment income | $ | 22 |  |  | $ | 21 |  |  | $ | 26 |
Revenue from External Customers by Products and Services | Commissions, fees and other revenues by product are as follows (in millions):
Years ended December 31 | 2016 |  | 2015 |  | 2014
Retail brokerage | $ | 6,096 |  |  | $ | 6,044 |  |  | $ | 6,334 |
Reinsurance brokerage | 1,367 |  |  | 1,361 |  |  | 1,474 |
Total Risk Solutions Segment | 7,463 |  |  | 7,405 |  |  | 7,808 |
Consulting services | 1,662 |  |  | 1,686 |  |  | 1,700 |
Outsourcing | 2,557 |  |  | 2,658 |  |  | 2,607 |
Intrasegment | (36 | ) |  | (41 | ) |  | (43 | )
Total HR Solutions Segment | 4,183 |  |  | 4,303 |  |  | 4,264 |
Intersegment | (41 | ) |  | (47 | ) |  | (53 | )
Total commissions, fees and other revenue | $ | 11,605 |  |  | $ | 11,661 |  |  | $ | 12,019 |
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):
Years ended December 31 | 2016 |  | 2015 |  | 2014
Risk Solutions | $ | 1,587 |  |  | $ | 1,506 |  |  | $ | 1,648 |
HR Solutions | 557 |  |  | 536 |  |  | 485 |
Segment income before income taxes | 2,144 |  |  | 2,042 |  |  | 2,133 |
Unallocated expenses | (238 | ) |  | (194 | ) |  | (167 | )
Interest income | 9 |  |  | 14 |  |  | 10 |
Interest expense | (282 | ) |  | (273 | ) |  | (255 | )
Other income | 36 |  |  | 100 |  |  | 44 |
Income before income taxes | $ | 1,669 |  |  | $ | 1,689 |  |  | $ | 1,765 |
Schedule of consolidated revenue by geographic area | Consolidated Revenue by geographic area, which is attributed on the basis of where the services are performed, is as follows (in millions):
Years ended December 31 | Total |  | United States |  | Americas other than U.S. |  | United Kingdom |  | Europe, Middle East, & Africa |  | Asia Pacific
2016 | 11,627 |  |  | $ | 6,078 |  |  | $ | 995 |  |  | $ | 1,378 |  |  | $ | 1,760 |  |  | $ | 1,416 |
2015 | 11,682 |  |  | 6,063 |  |  | 1,053 |  |  | 1,527 |  |  | 1,909 |  |  | 1,130 |
2014 | 12,045 |  |  | 5,824 |  |  | 1,176 |  |  | 1,623 |  |  | 2,189 |  |  | 1,233 |
Schedule of consolidated non-current assets by geographic area | Consolidated Non-current assets by geographic area are as follows (in millions):
As of December 31, 2016 | Total |  | United States |  | Americas other than U.S. |  | United Kingdom |  | Europe, Middle East, & Africa |  | Asia Pacific
Fixed assets, net | 765 |  |  | $ | 443 |  |  | $ | 62 |  |  | $ | 65 |  |  | $ | 85 |  |  | $ | 110 |
Goodwill, intangible assets and other | 12,382 |  |  | 6,947 |  |  | 887 |  |  | 2,091 |  |  | 2,054 |  |  | 403 |
Total | 13,147 |  |  | 7,390 |  |  | 949 |  |  | 2,156 |  |  | 2,139 |  |  | 513 |
As of December 31, 2015 | Total |  | United States |  | Americas other than U.S. |  | United Kingdom |  | Europe, Middle East, & Africa |  | Asia Pacific
Fixed assets, net | 765 |  |  | $ | 432 |  |  | $ | 48 |  |  | $ | 89 |  |  | $ | 89 |  |  | $ | 107 |
Goodwill, intangible assets and other | 12,253 |  |  | 6,635 |  |  | 368 |  |  | 2,606 |  |  | 2,181 |  |  | 463 |
Total | 13,018 |  |  | 7,067 |  |  | 416 |  |  | 2,695 |  |  | 2,270 |  |  | 570 |

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- Definition Tabular disclosure of the reconciliation of profit (loss) from reportable segments to the consolidated income (loss) before income tax expense (benefit) and discontinued operations. Includes, but is not limited to, reconciliation after income tax if income tax is allocated to the reportable segment. + 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=68060357&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=68060357&loc=d3e8906-108599 + Details
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- Definition Tabular disclosure of entity-wide revenues from external customers for each product or service or each group of similar products or services if the information is not provided as part of the reportable operating segment information. + References Reference 1: 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 + Details
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- Definition Tabular disclosure of the names of foreign countries from which revenue is material and the amount of revenue from external customers attributed to those countries. An entity may also provide subtotals of geographic information about groups of countries. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e9038-108599 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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- Definition Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss. + References Reference 1: 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8813-108599 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8721-108599 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8736-108599 + Details
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