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v3.3.1.900

Segment Information - Schedule of commissions, fees, and other revenue by products (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Commissions, fees and other | $ 3,283 | $ 2,736 | $ 2,800 | $ 2,842 | $ 3,292 | $ 2,873 | $ 2,913 | $ 2,941 | $ 11,661 | $ 12,019 | $ 11,787
Operating Segments [Member] | Risk Solutions [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Commissions, fees and other |  |  |  |  |  |  |  |  | 7,405 | 7,808 | 7,761
Operating Segments [Member] | HR Solutions [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Commissions, fees and other |  |  |  |  |  |  |  |  | 4,303 | 4,264 | 4,057
Operating Segments [Member] | Reinsurance Brokerage Revenues [Member] | Risk Solutions [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Commissions, fees and other |  |  |  |  |  |  |  |  | 1,361 | 1,474 | 1,505
Operating Segments [Member] | Retail Brokerage Revenues [Member] | Risk Solutions [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Commissions, fees and other |  |  |  |  |  |  |  |  | 6,044 | 6,334 | 6,256
Operating Segments [Member] | Reportable Subsegments [Member] | Outsourcing Revenues [Member] | HR Solutions [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Commissions, fees and other |  |  |  |  |  |  |  |  | 2,658 | 2,607 | 2,469
Operating Segments [Member] | Reportable Subsegments [Member] | Consulting Services Revenues [Member] | HR Solutions [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Commissions, fees and other |  |  |  |  |  |  |  |  | 1,686 | 1,700 | 1,626
Operating Segments [Member] | Intersubsegment Eliminations [Member] | HR Solutions [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Commissions, fees and other |  |  |  |  |  |  |  |  | (41) | (43) | (38)
Intersegment elimination [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Commissions, fees and other |  |  |  |  |  |  |  |  | $ (47) | $ (53) | $ (31)

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- Definition The sum of Commissions, Fees and Other Income. Commissions and fees reflects the total commissions and fees earned from providing services such as (1) brokerage and (2) other such services and activities performed for others. Other income reflects the sum of all other revenue and income recognized by the entity in the period not otherwise specified in the income statement. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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