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Fair Value Measurements (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Sep. 18, 2018
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Dec. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]              
Total consideration       $ 661 $ 734    
Adjustments to acquisition related contingent consideration liability       19      
Increase in fair value of contingent consideration due to 5% increase in projections       41      
Decrease in fair value of contingent consideration due to 5% decrease in projections       (31)      
Carrying value of investment   $ 296   296   $ 405  
Unrealized investment (losses) gains   0 $ (8) 0 $ 11    
Other investments   70   $ 70      
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   60   $ 60   63  
Private Equity Funds, Non-US              
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]              
Carrying value of investment   83   83   $ 76  
Equity Securities              
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]              
Investments, fair value   $ 132   $ 132      
Alexander Forbes Group Holdings Limited              
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]              
Share price (per share amount)   $ 4.95   $ 4.95     $ 7.50
Carrying value of investment   $ 153   $ 153      
Other than temporary impairment       $ 81      
Percentage of ownership in equity investment   33.00%   33.00%      
Benefitfocus              
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]              
Unrealized investment (losses) gains   $ 6   $ 38      
Money Market Funds              
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]              
Share price (per share amount)   $ 1.00   $ 1.00      
Jardine Lloyd Thompson Group plc              
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]              
Total consideration $ 5,200