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Restructuring and Separation Costs - Restructuring Costs by Segment (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Restructuring Cost and Reserve [Line Items]      
Restructuring and separation costs $ 25 $ 0 $ 234
One-Time Termination Benefits      
Restructuring Cost and Reserve [Line Items]      
Restructuring and separation costs 6    
Write-offs of Long-lived Assets      
Restructuring Cost and Reserve [Line Items]      
Restructuring and separation costs 19    
Consulting Fees      
Restructuring Cost and Reserve [Line Items]      
Restructuring and separation costs 1    
Contract Termination Costs      
Restructuring Cost and Reserve [Line Items]      
Restructuring and separation costs (1)    
Health Plans      
Restructuring Cost and Reserve [Line Items]      
Restructuring and separation costs (1)    
Health Plans | One-Time Termination Benefits      
Restructuring Cost and Reserve [Line Items]      
Restructuring and separation costs 1    
Health Plans | Write-offs of Long-lived Assets      
Restructuring Cost and Reserve [Line Items]      
Restructuring and separation costs (1)    
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 (1)    
Other      
Restructuring Cost and Reserve [Line Items]      
Restructuring and separation costs 26    
Other | One-Time Termination Benefits      
Restructuring Cost and Reserve [Line Items]      
Restructuring and separation costs 5    
Other | Write-offs of Long-lived Assets      
Restructuring Cost and Reserve [Line Items]      
Restructuring and separation costs 20    
Other | Consulting Fees      
Restructuring Cost and Reserve [Line Items]      
Restructuring and separation costs 1    
Other | Contract Termination Costs      
Restructuring Cost and Reserve [Line Items]      
Restructuring and separation costs 0    
2017 Restructuring Plan      
Restructuring Cost and Reserve [Line Items]      
Restructuring and separation costs 259    
2017 Restructuring Plan | Separation Costs - Former Executives      
Restructuring Cost and Reserve [Line Items]      
Restructuring and separation costs 36    
2017 Restructuring Plan | One-Time Termination Benefits      
Restructuring Cost and Reserve [Line Items]      
Restructuring and separation costs 73    
2017 Restructuring Plan | Write-offs of Long-lived Assets      
Restructuring Cost and Reserve [Line Items]      
Restructuring and separation costs 80    
2017 Restructuring Plan | Consulting Fees      
Restructuring Cost and Reserve [Line Items]      
Restructuring and separation costs 45    
2017 Restructuring Plan | Contract Termination Costs      
Restructuring Cost and Reserve [Line Items]      
Restructuring and separation costs 25    
2017 Restructuring Plan | Health Plans      
Restructuring Cost and Reserve [Line Items]      
Restructuring and separation costs 72    
2017 Restructuring Plan | Health Plans | Separation Costs - Former Executives      
Restructuring Cost and Reserve [Line Items]      
Restructuring and separation costs 0    
2017 Restructuring Plan | Health Plans | One-Time Termination Benefits      
Restructuring Cost and Reserve [Line Items]      
Restructuring and separation costs 34    
2017 Restructuring Plan | Health Plans | Write-offs of Long-lived Assets      
Restructuring Cost and Reserve [Line Items]      
Restructuring and separation costs 15    
2017 Restructuring Plan | Health Plans | Consulting Fees      
Restructuring Cost and Reserve [Line Items]      
Restructuring and separation costs 0    
2017 Restructuring Plan | Health Plans | Contract Termination Costs      
Restructuring Cost and Reserve [Line Items]      
Restructuring and separation costs 23    
2017 Restructuring Plan | Molina Medicaid Solutions      
Restructuring Cost and Reserve [Line Items]      
Restructuring and separation costs 8    
2017 Restructuring Plan | Molina Medicaid Solutions | Separation Costs - Former Executives      
Restructuring Cost and Reserve [Line Items]      
Restructuring and separation costs 0    
2017 Restructuring Plan | Molina Medicaid Solutions | One-Time Termination Benefits      
Restructuring Cost and Reserve [Line Items]      
Restructuring and separation costs 0    
2017 Restructuring Plan | Molina Medicaid Solutions | Write-offs of Long-lived Assets      
Restructuring Cost and Reserve [Line Items]      
Restructuring and separation costs 8    
2017 Restructuring Plan | Molina Medicaid Solutions | Consulting Fees      
Restructuring Cost and Reserve [Line Items]      
Restructuring and separation costs 0    
2017 Restructuring Plan | Molina Medicaid Solutions | Contract Termination Costs      
Restructuring Cost and Reserve [Line Items]      
Restructuring and separation costs 0    
2017 Restructuring Plan | Other      
Restructuring Cost and Reserve [Line Items]      
Restructuring and separation costs 179    
2017 Restructuring Plan | Other | Separation Costs - Former Executives      
Restructuring Cost and Reserve [Line Items]      
Restructuring and separation costs 36    
2017 Restructuring Plan | Other | One-Time Termination Benefits      
Restructuring Cost and Reserve [Line Items]      
Restructuring and separation costs 39    
2017 Restructuring Plan | Other | Write-offs of Long-lived Assets      
Restructuring Cost and Reserve [Line Items]      
Restructuring and separation costs 57    
2017 Restructuring Plan | Other | Consulting Fees      
Restructuring Cost and Reserve [Line Items]      
Restructuring and separation costs 45    
2017 Restructuring Plan | Other | Contract Termination Costs      
Restructuring Cost and Reserve [Line Items]      
Restructuring and separation costs $ 2