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Fair Value Measurements (Narrative) (Details)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
USD ($)
$ / shares
shares
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
$ / shares
shares
Sep. 30, 2016
USD ($)
Sep. 30, 2017
ZAR / shares
Apr. 30, 2017
ZAR / shares
Jan. 01, 2017
ZAR / shares
Dec. 31, 2016
USD ($)
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     $ (3)              
Increase in fair value of contingent consideration due to 5% increase in projections     18              
Decrease in fair value of contingent consideration due to 5% decrease in projections     19              
Carrying value of investment $ 405   405         $ 389    
Unrealized investment (losses) gains (8) $ 1 $ 11 $ 1            
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 72   $ 72         $ 79    
Alexander Forbes Group Holdings Limited                    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                    
Share price (per share amount) | ZAR / shares         ZAR 6.75         ZAR 7.50
Carrying value of investment $ 268   $ 268              
Percentage of ownership in equity investment 33.00%   33.00%              
Investment shares owned | shares 443   443              
Market value of investment $ 225   $ 225              
Share price, percentage of cost basis 90.00%   90.00%              
Share price, weighted average (per share amount) | ZAR / shares         ZAR 6.75          
Alexander Forbes Group Holdings Limited | Minimum                    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                    
Share price (per share amount) | (per share) $ 6.40   $ 6.40     ZAR 5.99        
Share price, percentage of purchase price 85.00%   85.00%              
Alexander Forbes Group Holdings Limited | Maximum                    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                    
Share price (per share amount) | (per share) $ 7.28   $ 7.28       ZAR 7.89      
Share price, percentage of purchase price 97.00%   97.00%              
Benefitfocus                    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                    
Market value of investment $ 95   $ 95              
Percentage of business interest acquired                 9.90%  
Total consideration                 $ 75  
Unrealized investment (losses) gains     $ 11              
Money Market Funds                    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                    
Share price (per share amount) | $ / shares $ 1.00   $ 1.00