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Restructuring and Separation Costs - Restructuring Costs by Segment (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended 24 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2018
Restructuring Cost and Reserve [Line Items]                        
Restructuring and separation costs $ 8 $ 5 $ 8 $ 25 $ 73 $ 118 $ 43 $ 0 $ 46 $ 234 $ 0  
IT Restructuring | Other                        
Restructuring Cost and Reserve [Line Items]                        
Restructuring and separation costs                 9      
IT Restructuring | Other | One-Time Termination Benefits                        
Restructuring Cost and Reserve [Line Items]                        
Restructuring and separation costs                 7      
IT Restructuring | Other | Consulting Fees                        
Restructuring Cost and Reserve [Line Items]                        
Restructuring and separation costs                 2      
2017 Restructuring Plan                        
Restructuring Cost and Reserve [Line Items]                        
Restructuring and separation costs                 37 234   $ 271
2017 Restructuring Plan | Separation Costs - Former Executives                        
Restructuring Cost and Reserve [Line Items]                        
Restructuring and separation costs                 0 36   36
2017 Restructuring Plan | One-Time Termination Benefits                        
Restructuring Cost and Reserve [Line Items]                        
Restructuring and separation costs                 5 67   72
2017 Restructuring Plan | Write-offs of Current and Long-lived Assets                        
Restructuring Cost and Reserve [Line Items]                        
Restructuring and separation costs                 19 61   80
2017 Restructuring Plan | Consulting Fees                        
Restructuring Cost and Reserve [Line Items]                        
Restructuring and separation costs                 1 44   45
2017 Restructuring Plan | Contract Termination Costs                        
Restructuring Cost and Reserve [Line Items]                        
Restructuring and separation costs                 12 26   38
2017 Restructuring Plan | Health Plans                        
Restructuring Cost and Reserve [Line Items]                        
Restructuring and separation costs                 11 73   84
2017 Restructuring Plan | Health Plans | Separation Costs - Former Executives                        
Restructuring Cost and Reserve [Line Items]                        
Restructuring and separation costs                 0 0   0
2017 Restructuring Plan | Health Plans | One-Time Termination Benefits                        
Restructuring Cost and Reserve [Line Items]                        
Restructuring and separation costs                 0 33   33
2017 Restructuring Plan | Health Plans | Write-offs of Current and Long-lived Assets                        
Restructuring Cost and Reserve [Line Items]                        
Restructuring and separation costs                 (1) 16   15
2017 Restructuring Plan | Health Plans | Consulting Fees                        
Restructuring Cost and Reserve [Line Items]                        
Restructuring and separation costs                 0 0   0
2017 Restructuring Plan | Health Plans | Contract Termination Costs                        
Restructuring Cost and Reserve [Line Items]                        
Restructuring and separation costs                 12 24   36
2017 Restructuring Plan | Other                        
Restructuring Cost and Reserve [Line Items]                        
Restructuring and separation costs                 26 161   187
2017 Restructuring Plan | Other | Separation Costs - Former Executives                        
Restructuring Cost and Reserve [Line Items]                        
Restructuring and separation costs                 0 36   36
2017 Restructuring Plan | Other | One-Time Termination Benefits                        
Restructuring Cost and Reserve [Line Items]                        
Restructuring and separation costs                 5 34   39
2017 Restructuring Plan | Other | Write-offs of Current and Long-lived Assets                        
Restructuring Cost and Reserve [Line Items]                        
Restructuring and separation costs                 20 45   65
2017 Restructuring Plan | Other | Consulting Fees                        
Restructuring Cost and Reserve [Line Items]                        
Restructuring and separation costs                 1 44   45
2017 Restructuring Plan | Other | Contract Termination Costs                        
Restructuring Cost and Reserve [Line Items]                        
Restructuring and separation costs                 $ 0 $ 2   $ 2