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Fair Value Measurements (Narrative) (Details)
shares in Millions, $ in Millions
3 Months Ended
Mar. 31, 2016
USD ($)
shares
Mar. 31, 2016
ZAR / shares
Dec. 31, 2015
USD ($)
Dec. 31, 2015
ZAR / shares
Feb. 24, 2015
USD ($)
Dec. 31, 2014
ZAR / shares
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Adjustments to acquisition related contingent consideration liability $ 5          
Increase in fair value of contingent consideration due to 5% increase in projections 30          
Decrease in fair value of contingent consideration due to 5% decrease in projections 41          
Carrying value of investment $ 347   $ 347      
Minimum            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Revenue target period (in years) 2 years          
Share price | ZAR / shares       ZAR 5.32    
Maximum            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Revenue target period (in years) 4 years          
Private Equity Funds, Foreign            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Carrying value of investment $ 73   $ 76      
Alexander Forbes Group Holdings Limited            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Carrying value of investment $ 230          
Investment shares owned | shares 443          
Share price | ZAR / shares   ZAR 6.70       ZAR 7.50
Market value of investment $ 197          
Alexander Forbes Group Holdings Limited | Minimum            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Share price | ZAR / shares   4.61        
Alexander Forbes Group Holdings Limited | Maximum            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Share price | ZAR / shares   ZAR 7.23   ZAR 10.38    
Mercer Consulting Group | Alexander Forbes Group Holdings Limited            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Percentage of ownership in equity investment 33.00%          
Mercer Consulting Group | Benefitfocus            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Market value of investment $ 94          
Percentage of business interest acquired         9.90%  
Total Consideration         $ 75