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Segment Information (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 segment | Sep. 30, 2013
Segment Reporting Information |  |  |  |
Number of reportable segments |  |  | 2 |
Total revenue | $ 2,880 | $ 2,794 | $ 8,746 | $ 8,606
Total commissions, fees and other revenue | 2,873 | 2,786 | 8,727 | 8,585
Total fiduciary investment income | 7 | 8 | 19 | 21
Operating income before income tax | 417 | 364 | 1,331 | 1,156
Interest income | 3 | 3 | 7 | 6
Interest expense | (65) | (53) | (188) | (153)
Other income | 35 | 39 | 34 | 54
Income before income taxes | 390 | 353 | 1,184 | 1,063
Total operating segments [Member] |  |  |  |
Segment Reporting Information |  |  |  |
Operating income before income tax | 456 | 408 | 1,454 | 1,289
Risk Solutions [Member] |  |  |  |
Segment Reporting Information |  |  |  |
Total revenue | 1,836 | 1,821 | 5,778 | 5,736
Total commissions, fees and other revenue | 1,829 | 1,813 | 5,759 | 5,715
Total fiduciary investment income | 7 | 8 | 19 | 21
Operating income before income tax | 343 | 333 | 1,205 | 1,127
Retail brokerage [Member] |  |  |  |
Segment Reporting Information |  |  |  |
Total commissions, fees and other revenue | 1,458 | 1,424 | 4,619 | 4,548
Reinsurance brokerage [Member] |  |  |  |
Segment Reporting Information |  |  |  |
Total commissions, fees and other revenue | 371 | 389 | 1,140 | 1,167
HR Solutions [Member] |  |  |  |
Segment Reporting Information |  |  |  |
Total revenue | 1,057 | 981 | 3,004 | 2,891
Total commissions, fees and other revenue | 1,057 | 981 | 3,004 | 2,891
Total fiduciary investment income | 0 | 0 | 0 | 0
Operating income before income tax | 113 | 75 | 249 | 162
Consulting services [Member] |  |  |  |
Segment Reporting Information |  |  |  |
Total commissions, fees and other revenue | 466 | 406 | 1,245 | 1,176
Outsourcing [Member] |  |  |  |
Segment Reporting Information |  |  |  |
Total commissions, fees and other revenue | 604 | 587 | 1,788 | 1,746
Intrasegment [Member] |  |  |  |
Segment Reporting Information |  |  |  |
Total commissions, fees and other revenue | (13) | (12) | (29) | (31)
Intersegment elimination [Member] |  |  |  |
Segment Reporting Information |  |  |  |
Total revenue | (13) | (8) | (36) | (21)
Total commissions, fees and other revenue | (13) | (8) | (36) | (21)
Unallocated Expense [Member] |  |  |  |
Segment Reporting Information |  |  |  |
Operating income before income tax | $ (39) | $ (44) | $ (123) | $ (133)

X
- 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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