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Restructuring and Separation Costs - Restructuring Costs by Segment (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended 18 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Jun. 30, 2018
Restructuring Cost and Reserve [Line Items]            
Restructuring and separation costs $ 8 $ 43 $ 33 $ 43 $ 234 $ 267
Separation Costs - Former Executives            
Restructuring Cost and Reserve [Line Items]            
Restructuring and separation costs       35    
One-Time Termination Benefits            
Restructuring Cost and Reserve [Line Items]            
Restructuring and separation costs (1)   5 0    
Write-offs of Long-lived Assets            
Restructuring Cost and Reserve [Line Items]            
Restructuring and separation costs 0   19 0    
Consulting Fees            
Restructuring Cost and Reserve [Line Items]            
Restructuring and separation costs 0   1 8    
Contract Termination Costs            
Restructuring Cost and Reserve [Line Items]            
Restructuring and separation costs 9   8 0    
Health Plans            
Restructuring Cost and Reserve [Line Items]            
Restructuring and separation costs 8   7      
Health Plans | One-Time Termination Benefits            
Restructuring Cost and Reserve [Line Items]            
Restructuring and separation costs (1)   0      
Health Plans | Write-offs of Long-lived Assets            
Restructuring Cost and Reserve [Line Items]            
Restructuring and separation costs 0   (1)      
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 $ 9   8      
Other            
Restructuring Cost and Reserve [Line Items]            
Restructuring and separation costs     26 43    
Other | Separation Costs - Former Executives            
Restructuring Cost and Reserve [Line Items]            
Restructuring and separation costs       35    
Other | One-Time Termination Benefits            
Restructuring Cost and Reserve [Line Items]            
Restructuring and separation costs     5 0    
Other | Write-offs of Long-lived Assets            
Restructuring Cost and Reserve [Line Items]            
Restructuring and separation costs     20 0    
Other | Consulting Fees            
Restructuring Cost and Reserve [Line Items]            
Restructuring and separation costs     1 8    
Other | Contract Termination Costs            
Restructuring Cost and Reserve [Line Items]            
Restructuring and separation costs     $ 0 $ 0    
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           72
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           34
2017 Restructuring Plan | Health Plans            
Restructuring Cost and Reserve [Line Items]            
Restructuring and separation costs           80
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           33
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           32
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