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Fair Value Measurements (Narrative) (Details)
shares in Millions, $ in Millions
9 Months Ended
Sep. 30, 2015
USD ($)
shares
Sep. 30, 2015
ZAR / shares
Feb. 24, 2015
USD ($)
Dec. 31, 2014
USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Adjustments to acquisition related contingent consideration liability $ 42      
Increase in fair value of contingent consideration due to 5% increase in projections 24      
Decrease in fair value of contingent consideration due to 5% decrease in projections 35      
Carrying value of investment $ 376     $ 388
Minimum [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Revenue target period (in years) 2 years      
Maximum [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Revenue target period (in years) 4 years      
Private Equity Funds, Foreign [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Carrying value of investment $ 76     $ 61
Alexander Forbes Group Holdings Limited [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Carrying value of investment $ 250      
Investment shares owned | shares 443      
Share price | ZAR / shares   ZAR 7.65    
Market value of investment $ 244      
Mercer Consulting Group [Member] | Alexander Forbes Group Holdings Limited [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Percentage of ownership in equity investment       34.00%
Mercer Consulting Group [Member] | Benefitfocus [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Market value of investment $ 88      
Percentage of business interest acquired     9.90%  
Total Consideration     $ 75