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Fair Value Measurements (Narrative) (Details)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended
Mar. 31, 2018
USD ($)
$ / shares
shares
Mar. 31, 2017
USD ($)
Mar. 31, 2018
R / shares
Dec. 31, 2017
USD ($)
Dec. 31, 2014
R / 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 19        
Decrease in fair value of contingent consideration due to 5% decrease in projections 20        
Carrying value of investment 424     $ 405  
Unrealized investment gains (losses) 0 $ (5)      
Other investments $ 59        
Minimum          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Revenue target period (in years) 2 years        
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 $ 74     $ 76  
Equity Securities          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Investments, fair value 89        
Alexander Forbes Group Holdings Limited          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Share price (per share amount) | R / shares     R 7.20   R 7.50
Carrying value of investment $ 286        
Percentage of ownership in equity investment 33.00%        
Investment shares owned | shares 443        
Market value of investment $ 269        
Share price, weighted average (per share amount) | R / shares     R 6.95    
Share price, percentage of cost basis 93.00%        
Alexander Forbes Group Holdings Limited | Minimum          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Share price (per share amount) | $ / shares $ 6.31        
Share price, percentage of purchase price 84.00%        
Alexander Forbes Group Holdings Limited | Maximum          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Share price (per share amount) | $ / shares $ 7.34        
Share price, percentage of purchase price 98.00%        
Benefitfocus          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Unrealized investment gains (losses) $ 8        
Money Market Funds          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Share price (per share amount) | $ / shares $ 1.00