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Restructuring and Separation Costs - Expected Costs (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2017
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2018
Restructuring Cost and Reserve [Line Items]            
Restructuring and separation costs $ 43 $ 0   $ 43 $ 0  
Minimum            
Estimated Costs Expected to be Incurred by Reportable Segment            
Total restructuring costs 170     170    
Maximum            
Estimated Costs Expected to be Incurred by Reportable Segment            
Total restructuring costs 190     190    
Separation Costs–Former Executives | Minimum            
Estimated Costs Expected to be Incurred by Reportable Segment            
Total restructuring costs 60     60    
Separation Costs–Former Executives | Maximum            
Estimated Costs Expected to be Incurred by Reportable Segment            
Total restructuring costs 70     70    
Other Restructuring Costs | Minimum            
Estimated Costs Expected to be Incurred by Reportable Segment            
Total restructuring costs 110     110    
Other Restructuring Costs | Maximum            
Estimated Costs Expected to be Incurred by Reportable Segment            
Total restructuring costs 120     120    
Health Plans            
Restructuring Cost and Reserve [Line Items]            
Restructuring and separation costs 0 0   0 0  
Health Plans | Minimum            
Estimated Costs Expected to be Incurred by Reportable Segment            
Total restructuring costs 80     80    
Health Plans | Maximum            
Estimated Costs Expected to be Incurred by Reportable Segment            
Total restructuring costs 90     90    
Health Plans | Separation Costs–Former Executives | Minimum            
Estimated Costs Expected to be Incurred by Reportable Segment            
Total restructuring costs 25     25    
Health Plans | Separation Costs–Former Executives | Maximum            
Estimated Costs Expected to be Incurred by Reportable Segment            
Total restructuring costs 30     30    
Health Plans | Other Restructuring Costs | Minimum            
Estimated Costs Expected to be Incurred by Reportable Segment            
Total restructuring costs 55     55    
Health Plans | Other Restructuring Costs | Maximum            
Estimated Costs Expected to be Incurred by Reportable Segment            
Total restructuring costs 60     60    
Other segment            
Restructuring Cost and Reserve [Line Items]            
Restructuring and separation costs 43 $ 0   43 $ 0  
Other segment | Minimum            
Estimated Costs Expected to be Incurred by Reportable Segment            
Total restructuring costs 90     90    
Other segment | Maximum            
Estimated Costs Expected to be Incurred by Reportable Segment            
Total restructuring costs 100     100    
Other segment | Separation Costs–Former Executives | Minimum            
Estimated Costs Expected to be Incurred by Reportable Segment            
Total restructuring costs 35     35    
Other segment | Separation Costs–Former Executives | Maximum            
Estimated Costs Expected to be Incurred by Reportable Segment            
Total restructuring costs 40     40    
Other segment | Other Restructuring Costs | Minimum            
Estimated Costs Expected to be Incurred by Reportable Segment            
Total restructuring costs 55     55    
Other segment | Other Restructuring Costs | Maximum            
Estimated Costs Expected to be Incurred by Reportable Segment            
Total restructuring costs $ 60     $ 60    
Forecast            
Restructuring Cost and Reserve [Line Items]            
Restructuring and separation costs           $ 40
Forecast | Minimum            
Restructuring Cost and Reserve [Line Items]            
Restructuring and separation costs     $ 130      
Forecast | Maximum            
Restructuring Cost and Reserve [Line Items]            
Restructuring and separation costs     $ 150