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Segment Information (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
segment
Sep. 30, 2015
USD ($)
Segment Reporting Information        
Number of reportable segments | segment     2  
Total revenue $ 2,746 $ 2,742 $ 8,304 $ 8,394
Total commissions, fees and other revenue 2,740 2,736 8,288 8,378
Total fiduciary investment income 6 6 16 16
Operating income before income tax 422 413 1,277 1,131
Interest income 1 3 6 10
Interest expense (70) (72) (212) (205)
Other income 9 8 27 51
Income before income taxes 362 352 1,098 987
Risk and Insurance Brokerage Services [Member]        
Segment Reporting Information        
Total fiduciary investment income 6 6 16 16
Consulting [Member]        
Segment Reporting Information        
Total fiduciary investment income 0 0 0 0
Segment Reconciling Items [Member]        
Segment Reporting Information        
Operating income before income tax (42) (45) (131) (133)
Interest income     6 10
Operating Segments [Member]        
Segment Reporting Information        
Operating income before income tax 464 458 1,408 1,264
Operating Segments [Member] | Risk and Insurance Brokerage Services [Member]        
Segment Reporting Information        
Total revenue 1,715 1,689 5,434 5,417
Total commissions, fees and other revenue 1,709 1,683 5,418 5,401
Operating income before income tax 330 324 1,132 1,015
Operating Segments [Member] | Consulting [Member]        
Segment Reporting Information        
Total revenue 1,041 1,064 2,902 3,013
Total commissions, fees and other revenue 1,041 1,064 2,902 3,013
Operating income before income tax 134 134 276 249
Intersegment elimination [Member]        
Segment Reporting Information        
Total revenue (10) (11) (32) (36)
Total commissions, fees and other revenue (10) (11) (32) (36)
Reinsurance Brokerage Revenues [Member] | Operating Segments [Member] | Risk and Insurance Brokerage Services [Member]        
Segment Reporting Information        
Total commissions, fees and other revenue 332 331 1,038 1,038
Retail Brokerage Revenues [Member] | Operating Segments [Member] | Risk and Insurance Brokerage Services [Member]        
Segment Reporting Information        
Total commissions, fees and other revenue 1,377 1,352 4,380 4,363
Intersubsegment Eliminations [Member] | Operating Segments [Member] | Consulting [Member]        
Segment Reporting Information        
Total commissions, fees and other revenue (11) (12) (17) (28)
Reportable Subsegments [Member] | Outsourcing Revenues [Member] | Operating Segments [Member] | Consulting [Member]        
Segment Reporting Information        
Total commissions, fees and other revenue 593 616 1,703 1,819
Reportable Subsegments [Member] | Consulting Services Revenues [Member] | Operating Segments [Member] | Consulting [Member]        
Segment Reporting Information        
Total commissions, fees and other revenue $ 459 $ 460 $ 1,216 $ 1,222