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Restructuring and Separation Costs - Restructuring Costs by Segment (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Restructuring Cost and Reserve [Line Items]        
Restructuring and separation costs $ 118 $ 0 $ 161 $ 0
Separation Costs - Former Executives        
Restructuring Cost and Reserve [Line Items]        
Restructuring and separation costs 0   35  
One-Time Termination Benefits        
Restructuring Cost and Reserve [Line Items]        
Restructuring and separation costs 50   50  
Write-offs of Long-lived Assets        
Restructuring Cost and Reserve [Line Items]        
Restructuring and separation costs 49   49  
Consulting Fees        
Restructuring Cost and Reserve [Line Items]        
Restructuring and separation costs 16   24  
Contract Termination Costs        
Restructuring Cost and Reserve [Line Items]        
Restructuring and separation costs 3   3  
Health Plans        
Restructuring Cost and Reserve [Line Items]        
Restructuring and separation costs 33 0 33 0
Health Plans | Separation Costs - Former Executives        
Restructuring Cost and Reserve [Line Items]        
Restructuring and separation costs 0   0  
Health Plans | One-Time Termination Benefits        
Restructuring Cost and Reserve [Line Items]        
Restructuring and separation costs 27   27  
Health Plans | Write-offs of Long-lived Assets        
Restructuring Cost and Reserve [Line Items]        
Restructuring and separation costs 6   6  
Health Plans | Consulting Fees        
Restructuring Cost and Reserve [Line Items]        
Restructuring and separation costs 0   0  
Health Plans | Contract Termination Costs        
Restructuring Cost and Reserve [Line Items]        
Restructuring and separation costs 0   0  
Molina Medicaid Solutions        
Restructuring Cost and Reserve [Line Items]        
Restructuring and separation costs 8 0 8 0
Molina Medicaid Solutions | Separation Costs - Former Executives        
Restructuring Cost and Reserve [Line Items]        
Restructuring and separation costs 0   0  
Molina Medicaid Solutions | One-Time Termination Benefits        
Restructuring Cost and Reserve [Line Items]        
Restructuring and separation costs 0   0  
Molina Medicaid Solutions | Write-offs of Long-lived Assets        
Restructuring Cost and Reserve [Line Items]        
Restructuring and separation costs 8   8  
Molina Medicaid Solutions | Consulting Fees        
Restructuring Cost and Reserve [Line Items]        
Restructuring and separation costs 0   0  
Molina Medicaid Solutions | Contract Termination Costs        
Restructuring Cost and Reserve [Line Items]        
Restructuring and separation costs 0   0  
Other        
Restructuring Cost and Reserve [Line Items]        
Restructuring and separation costs 77 $ 0 120 $ 0
Other | Separation Costs - Former Executives        
Restructuring Cost and Reserve [Line Items]        
Restructuring and separation costs 0   35  
Other | One-Time Termination Benefits        
Restructuring Cost and Reserve [Line Items]        
Restructuring and separation costs 23   23  
Other | Write-offs of Long-lived Assets        
Restructuring Cost and Reserve [Line Items]        
Restructuring and separation costs 35   35  
Other | Consulting Fees        
Restructuring Cost and Reserve [Line Items]        
Restructuring and separation costs 16   24  
Other | Contract Termination Costs        
Restructuring Cost and Reserve [Line Items]        
Restructuring and separation costs $ 3   $ 3