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Restructuring and Separation Costs - Restructuring Costs by Segment (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Restructuring Cost and Reserve [Line Items]              
Restructuring and separation costs $ 73 $ 118 $ 43 $ 0 $ 234 $ 0 $ 0
Separation Costs - Former Executives              
Restructuring Cost and Reserve [Line Items]              
Restructuring and separation costs         36    
One-Time Termination Benefits              
Restructuring Cost and Reserve [Line Items]              
Restructuring and separation costs         67    
Write-offs of Long-lived Assets              
Restructuring Cost and Reserve [Line Items]              
Restructuring and separation costs         61    
Consulting Fees              
Restructuring Cost and Reserve [Line Items]              
Restructuring and separation costs         44    
Contract Termination Costs              
Restructuring Cost and Reserve [Line Items]              
Restructuring and separation costs         26    
Health Plans              
Restructuring Cost and Reserve [Line Items]              
Restructuring and separation costs         73    
Health Plans | Separation Costs - Former Executives              
Restructuring Cost and Reserve [Line Items]              
Restructuring and separation costs         0    
Health Plans | One-Time Termination Benefits              
Restructuring Cost and Reserve [Line Items]              
Restructuring and separation costs         33    
Health Plans | Write-offs of Long-lived Assets              
Restructuring Cost and Reserve [Line Items]              
Restructuring and separation costs         16    
Health Plans | Consulting Fees              
Restructuring Cost and Reserve [Line Items]              
Restructuring and separation costs         0    
Health Plans | Contract Termination Costs              
Restructuring Cost and Reserve [Line Items]              
Restructuring and separation costs         24    
Molina Medicaid Solutions              
Restructuring Cost and Reserve [Line Items]              
Restructuring and separation costs         8    
Molina Medicaid Solutions | Separation Costs - Former Executives              
Restructuring Cost and Reserve [Line Items]              
Restructuring and separation costs         0    
Molina Medicaid Solutions | One-Time Termination Benefits              
Restructuring Cost and Reserve [Line Items]              
Restructuring and separation costs         0    
Molina Medicaid Solutions | Write-offs of Long-lived Assets              
Restructuring Cost and Reserve [Line Items]              
Restructuring and separation costs         8    
Molina Medicaid Solutions | Consulting Fees              
Restructuring Cost and Reserve [Line Items]              
Restructuring and separation costs         0    
Molina Medicaid Solutions | Contract Termination Costs              
Restructuring Cost and Reserve [Line Items]              
Restructuring and separation costs         0    
Other              
Restructuring Cost and Reserve [Line Items]              
Restructuring and separation costs         153    
Other | Separation Costs - Former Executives              
Restructuring Cost and Reserve [Line Items]              
Restructuring and separation costs         36    
Other | One-Time Termination Benefits              
Restructuring Cost and Reserve [Line Items]              
Restructuring and separation costs         34    
Other | Write-offs of Long-lived Assets              
Restructuring Cost and Reserve [Line Items]              
Restructuring and separation costs         37    
Other | Consulting Fees              
Restructuring Cost and Reserve [Line Items]              
Restructuring and separation costs         44    
Other | Contract Termination Costs              
Restructuring Cost and Reserve [Line Items]              
Restructuring and separation costs         $ 2