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Segment Information | 12 Months Ended
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Dec. 31, 2017
Segment Reporting [Abstract] |
Segment Information | Segment Information Beginning in the first quarter of 2017 and following the transaction described in Note 4 “Discontinued Operations,” the Company began leading a set of initiatives designed to strengthen Aon and unite the firm with one portfolio of capability enabled by proprietary data and analytics and one operating model to deliver additional insight, connectivity and efficiency. These initiatives reinforce Aon’s return on invested capital (“ROIC”) decision-making process and emphasis on free cash flow. The Company is now operating as one segment that includes all of Aon’s continuing operations, which as a global professional services firm provides advice and solutions to clients focused on risk, retirement, and health through five revenue lines which make up its principal products and services. The CODM assesses the performance of the Company and allocates resources based on one company: Aon United. The Company’s reportable operating segment has been determined using a management approach, which is consistent with the basis and manner in which Aon’s CODM uses financial information for the purposes of allocating resources and evaluating performance. The CODM assesses performance and allocates resources based on total Aon results against its key four metrics, including organic revenue growth, expense discipline, and collaborative behaviors that maximize value for Aon and its shareholders, regardless of which revenue line it benefits. Prior period comparative segment information has been restated to conform with current year presentation. In prior periods, the Company did not include unallocated expenses in segment operating income, which represented corporate governance costs not allocated to the previous operating segments. These costs are now reflected within operating expenses for the current and prior period. Revenue from continuing operations for each of the Company’s principal product and service lines is as follows (in millions):
| Year ended December 31
| 2017 |  | 2016 |  | 2015
Commercial Risk Solutions | $ | 4,169 |  |  | $ | 3,929 |  |  | $ | 4,029 |
Reinsurance Solutions | 1,429 |  |  | 1,361 |  |  | 1,358 |
Retirement Solutions | 1,755 |  |  | 1,707 |  |  | 1,916 |
Health Solutions | 1,515 |  |  | 1,370 |  |  | 1,167 |
Data & Analytic Services | 1,140 |  |  | 1,050 |  |  | 1,021 |
Elimination | (10 | ) |  | (8 | ) |  | (11 | )
Total revenue | $ | 9,998 |  |  | $ | 9,409 |  |  | $ | 9,480 |
As Aon is operating as one segment, segment profit or loss is consistent with consolidated reporting as disclosed on the Consolidated Statements of Income. Revenues are generally attributed to geographic areas based on the location of the resources producing the revenues. Intercompany revenues and expenses are eliminated in consolidated results. 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
2017 | $ | 9,998 |  |  | $ | 4,425 |  |  | $ | 976 |  |  | $ | 1,436 |  |  | $ | 2,025 |  |  | $ | 1,136 |
2016 | 9,409 |  |  | 3,981 |  |  | 899 |  |  | 1,354 |  |  | 1,760 |  |  | 1,415 |
2015 | 9,480 |  |  | 3,924 |  |  | 1,118 |  |  | 1,419 |  |  | 1,826 |  |  | 1,193 |
Consolidated Non-current assets by geographic area are as follows (in millions):
Years ended December 31 | Total |  | United States |  | Americas other than U.S. |  | United Kingdom |  | Europe, Middle East, & Africa |  | Asia Pacific
2017 | $ | 564 |  |  | $ | 239 |  |  | $ | 47 |  |  | $ | 68 |  |  | $ | 114 |  |  | $ | 96 |
2016 | 550 |  |  | 243 |  |  | 60 |  |  | 65 |  |  | 85 |  |  | 97 |

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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 -URI http://asc.fasb.org/topic&trid=2134510 + Details
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