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Segment Information (Details)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2015
USD ($)
Jun. 30, 2014
USD ($)
Jun. 30, 2015
USD ($)
segment
Jun. 30, 2014
USD ($)
Segment Reporting Information        
Number of reportable segments | segment     2  
Total revenue $ 2,805 $ 2,919 $ 5,652 $ 5,866
Total commissions, fees and other revenue 2,800 2,913 5,642 5,854
Total fiduciary investment income 5 6 10 12
Operating income before income tax 277 445 718 914
Interest income 4 2 7 4
Interest expense (68) (65) (133) (123)
Other income (expense) 1 (2) 43 (1)
Income before income taxes 214 380 635 794
Total operating segments [Member]        
Segment Reporting Information        
Operating income before income tax 318 486 806 998
Risk Solutions [Member]        
Segment Reporting Information        
Total revenue 1,833 1,948 3,728 3,942
Total commissions, fees and other revenue 1,828 1,942 3,718 3,930
Total fiduciary investment income 5 6 10 12
Operating income before income tax 279 417 691 862
Retail brokerage [Member]        
Segment Reporting Information        
Total commissions, fees and other revenue 1,498 1,582 3,011 3,161
Reinsurance brokerage [Member]        
Segment Reporting Information        
Total commissions, fees and other revenue 330 360 707 769
HR Solutions [Member]        
Segment Reporting Information        
Total revenue 979 982 1,949 1,947
Total commissions, fees and other revenue 979 982 1,949 1,947
Total fiduciary investment income 0 0 0 0
Operating income before income tax 39 69 115 136
Consulting services [Member]        
Segment Reporting Information        
Total commissions, fees and other revenue 391 395 762 779
Outsourcing [Member]        
Segment Reporting Information        
Total commissions, fees and other revenue 599 595 1,203 1,184
Intrasegment [Member]        
Segment Reporting Information        
Total commissions, fees and other revenue (11) (8) (16) (16)
Intersegment elimination [Member]        
Segment Reporting Information        
Total revenue (7) (11) (25) (23)
Total commissions, fees and other revenue (7) (11) (25) (23)
Unallocated Expense [Member]        
Segment Reporting Information        
Operating income before income tax $ (41) $ (41) $ (88) $ (84)