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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, 2017
USD ($)
$ / shares
shares
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
$ / shares
shares
Jun. 30, 2016
USD ($)
Jun. 30, 2017
ZAR / shares
Jun. 23, 2017
ZAR / shares
Jun. 01, 2017
ZAR / shares
Dec. 31, 2016
USD ($)
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     $ (8)              
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     22              
Carrying value of investment $ 416   416         $ 389    
Unrealized investment gains 24 $ 0 $ 19 $ 0            
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 76   $ 76         $ 79    
Alexander Forbes Group Holdings Limited                    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                    
Share price (per share amount) | ZAR / shares         ZAR 6.95         ZAR 7.50
Carrying value of investment $ 275   $ 275              
Percentage of ownership in equity investment 33.00%   33.00%              
Investment shares owned | shares 443   443              
Market value of investment $ 237   $ 237              
Alexander Forbes Group Holdings Limited | Minimum                    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                    
Share price (per share amount) | ZAR / shares         5.99   ZAR 6.25      
Alexander Forbes Group Holdings Limited | Maximum                    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                    
Share price (per share amount) | ZAR / shares         ZAR 7.95 ZAR 7.31        
Benefitfocus                    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                    
Market value of investment $ 102   102              
Percentage of business interest acquired                 9.90%  
Total consideration                 $ 75  
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