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Segment Information (Details)
$ in Millions
3 Months Ended
Mar. 31, 2016
USD ($)
segment
Mar. 31, 2015
USD ($)
Segment Reporting Information    
Number of reportable segments | segment 2  
Total revenue $ 2,792 $ 2,847
Total commissions, fees and other revenue 2,787 2,842
Total fiduciary investment income 5 5
Operating income before income tax 450 441
Interest income 2 3
Interest expense (69) (65)
Other income 18 42
Income before income taxes 401 421
Risk and Insurance Brokerage Services [Member]    
Segment Reporting Information    
Total fiduciary investment income 5 5
Consulting [Member]    
Segment Reporting Information    
Total fiduciary investment income 0 0
Segment Reconciling Items [Member]    
Segment Reporting Information    
Operating income before income tax (46) (47)
Operating Segments [Member]    
Segment Reporting Information    
Operating income before income tax 496 488
Operating Segments [Member] | Risk and Insurance Brokerage Services [Member]    
Segment Reporting Information    
Total revenue 1,872 1,895
Total commissions, fees and other revenue 1,867 1,890
Operating income before income tax 429 412
Operating Segments [Member] | Consulting [Member]    
Segment Reporting Information    
Total revenue 930 970
Total commissions, fees and other revenue 930 970
Operating income before income tax 67 76
Intersegment elimination [Member]    
Segment Reporting Information    
Total revenue (10) (18)
Total commissions, fees and other revenue (10) (18)
Reinsurance Brokerage Revenues [Member] | Operating Segments [Member] | Risk and Insurance Brokerage Services [Member]    
Segment Reporting Information    
Total commissions, fees and other revenue 372 377
Retail Brokerage Revenues [Member] | Operating Segments [Member] | Risk and Insurance Brokerage Services [Member]    
Segment Reporting Information    
Total commissions, fees and other revenue 1,495 1,513
Intersubsegment Eliminations [Member] | Operating Segments [Member] | Consulting [Member]    
Segment Reporting Information    
Total commissions, fees and other revenue (4) (5)
Reportable Subsegments [Member] | Outsourcing Revenues [Member] | Operating Segments [Member] | Consulting [Member]    
Segment Reporting Information    
Total commissions, fees and other revenue 560 604
Reportable Subsegments [Member] | Consulting Services Revenues [Member] | Operating Segments [Member] | Consulting [Member]    
Segment Reporting Information    
Total commissions, fees and other revenue $ 374 $ 371