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Segment Information (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 segment | Jun. 30, 2013
Segment Reporting Information |  |  |  |
Number of reportable segments |  |  | 2 |
Total revenue | $ 2,919 | $ 2,897 | $ 5,866 | $ 5,812
Total commissions, fees and other revenue | 2,913 | 2,891 | 5,854 | 5,799
Total fiduciary investment income | 6 | 6 | 12 | 13
Operating income before income tax | 445 | 382 | 914 | 792
Interest income | 2 | 2 | 4 | 3
Interest expense | (65) | (48) | (123) | (100)
Other (expense) income | (2) | 6 | (1) | 15
Income before income taxes | 380 | 342 | 794 | 710
Total operating segments [Member] |  |  |  |
Segment Reporting Information |  |  |  |
Operating income before income tax | 486 | 427 | 998 | 881
Risk Solutions [Member] |  |  |  |
Segment Reporting Information |  |  |  |
Total revenue | 1,948 | 1,944 | 3,942 | 3,915
Total commissions, fees and other revenue | 1,942 | 1,938 | 3,930 | 3,902
Total fiduciary investment income | 6 | 6 | 12 | 13
Operating income before income tax | 417 | 391 | 862 | 794
Retail brokerage |  |  |  |
Segment Reporting Information |  |  |  |
Total commissions, fees and other revenue | 1,582 | 1,562 | 3,161 | 3,124
Reinsurance brokerage |  |  |  |
Segment Reporting Information |  |  |  |
Total commissions, fees and other revenue | 360 | 376 | 769 | 778
HR Solutions [Member] |  |  |  |
Segment Reporting Information |  |  |  |
Total revenue | 982 | 956 | 1,947 | 1,910
Total commissions, fees and other revenue | 982 | 956 | 1,947 | 1,910
Total fiduciary investment income | 0 | 0 | 0 | 0
Operating income before income tax | 69 | 36 | 136 | 87
Consulting services |  |  |  |
Segment Reporting Information |  |  |  |
Total commissions, fees and other revenue | 395 | 388 | 779 | 770
Outsourcing |  |  |  |
Segment Reporting Information |  |  |  |
Total commissions, fees and other revenue | 595 | 578 | 1,184 | 1,159
Intrasegment |  |  |  |
Segment Reporting Information |  |  |  |
Total commissions, fees and other revenue | (8) | (10) | (16) | (19)
Intersegment elimination |  |  |  |
Segment Reporting Information |  |  |  |
Total revenue | (11) | (3) | (23) | (13)
Total commissions, fees and other revenue | (11) | (3) | (23) | (13)
Unallocated Expense |  |  |  |
Segment Reporting Information |  |  |  |
Operating income before income tax | $ (41) | $ (45) | $ (84) | $ (89)

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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