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Restructuring and Separation Costs - Expected Costs (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2018
Restructuring Cost and Reserve [Line Items]            
Increase in expected restructuring costs   $ 50        
Restructuring and separation costs   118 $ 0 $ 161 $ 0  
Minimum            
Estimated Costs Expected to be Incurred by Reportable Segment            
Total restructuring costs   220   220    
Maximum            
Estimated Costs Expected to be Incurred by Reportable Segment            
Total restructuring costs   240   240    
Separation Costs - Former Executives            
Restructuring Cost and Reserve [Line Items]            
Restructuring and separation costs   0   35    
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   160   160    
Other Restructuring Costs | Maximum            
Estimated Costs Expected to be Incurred by Reportable Segment            
Total restructuring costs   170   170    
Health Plans            
Restructuring Cost and Reserve [Line Items]            
Restructuring and separation costs   33 0 33 0  
Health Plans | Minimum            
Estimated Costs Expected to be Incurred by Reportable Segment            
Total restructuring costs   70   70    
Health Plans | Maximum            
Estimated Costs Expected to be Incurred by Reportable Segment            
Total restructuring costs   80   80    
Health Plans | Separation Costs - Former Executives            
Restructuring Cost and Reserve [Line Items]            
Restructuring and separation costs   0   0    
Health Plans | Separation Costs - Former Executives | Minimum            
Estimated Costs Expected to be Incurred by Reportable Segment            
Total restructuring costs   30   30    
Health Plans | Separation Costs - Former Executives | Maximum            
Estimated Costs Expected to be Incurred by Reportable Segment            
Total restructuring costs   35   35    
Health Plans | Other Restructuring Costs | Minimum            
Estimated Costs Expected to be Incurred by Reportable Segment            
Total restructuring costs   40   40    
Health Plans | Other Restructuring Costs | Maximum            
Estimated Costs Expected to be Incurred by Reportable Segment            
Total restructuring costs   45   45    
Molina Medicaid Solutions            
Restructuring Cost and Reserve [Line Items]            
Restructuring and separation costs   8 0 8 0  
Estimated Costs Expected to be Incurred by Reportable Segment            
Total restructuring costs   10   10    
Molina Medicaid Solutions | Separation Costs - Former Executives            
Restructuring Cost and Reserve [Line Items]            
Restructuring and separation costs   0   0    
Estimated Costs Expected to be Incurred by Reportable Segment            
Total restructuring costs   0   0    
Molina Medicaid Solutions | Other Restructuring Costs            
Estimated Costs Expected to be Incurred by Reportable Segment            
Total restructuring costs   10   10    
Other segment            
Restructuring Cost and Reserve [Line Items]            
Restructuring and separation costs   77 $ 0 120 $ 0  
Other segment | Minimum            
Estimated Costs Expected to be Incurred by Reportable Segment            
Total restructuring costs   140   140    
Other segment | Maximum            
Estimated Costs Expected to be Incurred by Reportable Segment            
Total restructuring costs   150   150    
Other segment | Separation Costs - Former Executives            
Restructuring Cost and Reserve [Line Items]            
Restructuring and separation costs   0   35    
Other segment | Separation Costs - Former Executives | Minimum            
Estimated Costs Expected to be Incurred by Reportable Segment            
Total restructuring costs   30   30    
Other segment | Separation Costs - Former Executives | Maximum            
Estimated Costs Expected to be Incurred by Reportable Segment            
Total restructuring costs   35   35    
Other segment | Other Restructuring Costs | Minimum            
Estimated Costs Expected to be Incurred by Reportable Segment            
Total restructuring costs   110   110    
Other segment | Other Restructuring Costs | Maximum            
Estimated Costs Expected to be Incurred by Reportable Segment            
Total restructuring costs   $ 115   $ 115    
Forecast | Minimum            
Restructuring Cost and Reserve [Line Items]            
Restructuring and separation costs $ 70         $ 20
Forecast | Maximum            
Restructuring Cost and Reserve [Line Items]            
Restructuring and separation costs $ 90         $ 40