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Segment Information (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2014 segment | Mar. 31, 2013
Segment Reporting Information |  |
Number of reportable segments | 2 |
Total revenue | $ 2,947 | $ 2,915
Total commissions, fees and other revenue | 2,941 | 2,908
Total fiduciary investment income | 6 | 7
Operating income before income tax | 469 | 410
Interest income | 2 | 1
Interest expense | (58) | (52)
Other income | 1 | 9
Income from continuing operations before income taxes | 414 | 368
Total operating segments [Member] |  |
Segment Reporting Information |  |
Operating income before income tax | 512 | 454
Risk Solutions [Member] |  |
Segment Reporting Information |  |
Total revenue | 1,994 | 1,971
Total commissions, fees and other revenue | 1,988 | 1,964
Total fiduciary investment income | 6 | 7
Operating income before income tax | 445 | 403
Retail brokerage |  |
Segment Reporting Information |  |
Total commissions, fees and other revenue | 1,579 | 1,562
Reinsurance brokerage |  |
Segment Reporting Information |  |
Total commissions, fees and other revenue | 409 | 402
HR Solutions [Member] |  |
Segment Reporting Information |  |
Total revenue | 965 | 954
Total commissions, fees and other revenue | 965 | 954
Total fiduciary investment income | 0 | 0
Operating income before income tax | 67 | 51
Consulting services |  |
Segment Reporting Information |  |
Total commissions, fees and other revenue | 384 | 382
Outsourcing |  |
Segment Reporting Information |  |
Total commissions, fees and other revenue | 589 | 581
Intrasegment |  |
Segment Reporting Information |  |
Total commissions, fees and other revenue | (8) | (9)
Intersegment elimination |  |
Segment Reporting Information |  |
Total revenue | (12) | (10)
Total commissions, fees and other revenue | (12) | (10)
Unallocated Expense |  |
Segment Reporting Information |  |
Operating income before income tax | $ (43) | $ (44)

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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 Income earned on the interest-bearing assets used as temporary investments of premiums collected from insured's but not yet remitted to insurance companies. + References No definition available. + Details
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