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Fair Value Measurements (Narrative) (Details)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
USD ($)
$ / shares
shares
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
$ / shares
shares
Jun. 30, 2017
USD ($)
Jun. 30, 2018
R / shares
Dec. 31, 2017
USD ($)
Dec. 31, 2014
R / shares
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]              
Adjustments to acquisition related contingent consideration liability     $ 11        
Increase in fair value of contingent consideration due to 5% increase in projections     22        
Decrease in fair value of contingent consideration due to 5% decrease in projections     (23)        
Carrying value of investment $ 391   391     $ 405  
Unrealized investment gains 0 $ 24 0 $ 19      
Other investments 64   $ 64        
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 Insurance and Consulting              
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]              
Carrying value of investment 63   $ 63     63  
Private Equity Funds, Non-US              
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]              
Carrying value of investment 82   82     $ 76  
Equity Securities              
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]              
Investments, fair value 113   113        
Alexander Forbes Group Holdings Limited              
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]              
Share price (per share amount) | R / shares         R 5.77   R 7.50
Carrying value of investment $ 246   $ 246        
Percentage of ownership in equity investment 33.00%   33.00%        
Investment shares owned | shares 443   443        
Market value of investment $ 188   $ 188        
Share price, weighted average (per share amount) | R / shares         R 6.66    
Share price, percentage of cost basis 89.00%   89.00%        
Alexander Forbes Group Holdings Limited | Minimum              
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]              
Share price (per share amount) | $ / shares $ 5.00   $ 5.00        
Share price, percentage of purchase price 67.00%   67.00%        
Alexander Forbes Group Holdings Limited | Maximum              
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]              
Share price (per share amount) | $ / shares $ 7.34   $ 7.34        
Share price, percentage of purchase price 98.00%   98.00%        
Benefitfocus              
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]              
Unrealized investment gains     $ 19        
Money Market Funds              
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]              
Share price (per share amount) | $ / shares $ 1.00   $ 1.00