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Segment Information - Schedule of total revenue by business segments (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 3,262 | $ 2,760 | $ 2,800 | $ 2,805 | $ 3,227 | $ 2,752 | $ 2,836 | $ 2,867 | $ 11,627 | $ 11,682 | $ 12,045
Commissions, fees and other | $ 3,256 | $ 2,754 | $ 2,795 | $ 2,800 | $ 3,222 | $ 2,746 | $ 2,831 | $ 2,862 | 11,605 | 11,661 | 12,019
Operating Segments | Risk Solutions |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 7,485 | 7,426 | 7,834
Commissions, fees and other |  |  |  |  |  |  |  |  | 7,463 | 7,405 | 7,808
Operating Segments | HR Solutions |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 4,183 | 4,303 | 4,264
Commissions, fees and other |  |  |  |  |  |  |  |  | 4,183 | 4,303 | 4,264
Intersegment elimination |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | (41) | (47) | (53)
Commissions, fees and other |  |  |  |  |  |  |  |  | $ (41) | $ (47) | $ (53)

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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 Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: 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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