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Restructuring and Separation Costs - Restructuring Costs by Segment (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended 21 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Sep. 30, 2018
Restructuring Cost and Reserve [Line Items]            
Restructuring and separation costs $ 5 $ 118 $ 38 $ 161    
IT Restructuring            
Restructuring Cost and Reserve [Line Items]            
Restructuring and separation costs 3          
IT Restructuring | Other            
Restructuring Cost and Reserve [Line Items]            
Restructuring and separation costs     3      
IT Restructuring | Other | One-Time Termination Benefits            
Restructuring Cost and Reserve [Line Items]            
Restructuring and separation costs     2      
IT Restructuring | Other | Consulting Fees            
Restructuring Cost and Reserve [Line Items]            
Restructuring and separation costs     1      
IT Restructuring | 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 2 118 35 161 $ 234 $ 269
2017 Restructuring Plan | Separation Costs - Former Executives            
Restructuring Cost and Reserve [Line Items]            
Restructuring and separation costs   0   35   36
2017 Restructuring Plan | One-Time Termination Benefits            
Restructuring Cost and Reserve [Line Items]            
Restructuring and separation costs 0 50 5 50   72
2017 Restructuring Plan | Write-offs of Long-lived Assets            
Restructuring Cost and Reserve [Line Items]            
Restructuring and separation costs 0 49 19 49   80
2017 Restructuring Plan | Consulting Fees            
Restructuring Cost and Reserve [Line Items]            
Restructuring and separation costs 0 16 1 24   45
2017 Restructuring Plan | Contract Termination Costs            
Restructuring Cost and Reserve [Line Items]            
Restructuring and separation costs 2 3 10 3   36
2017 Restructuring Plan | Health Plans            
Restructuring Cost and Reserve [Line Items]            
Restructuring and separation costs 2 33 9 33   82
2017 Restructuring Plan | Health Plans | Separation Costs - Former Executives            
Restructuring Cost and Reserve [Line Items]            
Restructuring and separation costs   0   0   0
2017 Restructuring Plan | Health Plans | One-Time Termination Benefits            
Restructuring Cost and Reserve [Line Items]            
Restructuring and separation costs 0 27 0 27   33
2017 Restructuring Plan | Health Plans | Write-offs of Long-lived Assets            
Restructuring Cost and Reserve [Line Items]            
Restructuring and separation costs 0 6 (1) 6   15
2017 Restructuring Plan | Health Plans | Consulting Fees            
Restructuring Cost and Reserve [Line Items]            
Restructuring and separation costs 0 0 0 0   0
2017 Restructuring Plan | Health Plans | Contract Termination Costs            
Restructuring Cost and Reserve [Line Items]            
Restructuring and separation costs $ 2 0 10 0   34
2017 Restructuring Plan | Molina Medicaid Solutions            
Restructuring Cost and Reserve [Line Items]            
Restructuring and separation costs   8   8   8
2017 Restructuring Plan | Molina Medicaid Solutions | Separation Costs - Former Executives            
Restructuring Cost and Reserve [Line Items]            
Restructuring and separation costs   0   0   0
2017 Restructuring Plan | Molina Medicaid Solutions | One-Time Termination Benefits            
Restructuring Cost and Reserve [Line Items]            
Restructuring and separation costs   0   0   0
2017 Restructuring Plan | Molina Medicaid Solutions | Write-offs of Long-lived Assets            
Restructuring Cost and Reserve [Line Items]            
Restructuring and separation costs   8   8   8
2017 Restructuring Plan | Molina Medicaid Solutions | Consulting Fees            
Restructuring Cost and Reserve [Line Items]            
Restructuring and separation costs   0   0   0
2017 Restructuring Plan | Molina Medicaid Solutions | Contract Termination Costs            
Restructuring Cost and Reserve [Line Items]            
Restructuring and separation costs   0   0   0
2017 Restructuring Plan | Other            
Restructuring Cost and Reserve [Line Items]            
Restructuring and separation costs   77 26 120   179
2017 Restructuring Plan | Other | Separation Costs - Former Executives            
Restructuring Cost and Reserve [Line Items]            
Restructuring and separation costs   0   35   36
2017 Restructuring Plan | Other | One-Time Termination Benefits            
Restructuring Cost and Reserve [Line Items]            
Restructuring and separation costs   23 5 23   39
2017 Restructuring Plan | Other | Write-offs of Long-lived Assets            
Restructuring Cost and Reserve [Line Items]            
Restructuring and separation costs   35 20 35   57
2017 Restructuring Plan | Other | Consulting Fees            
Restructuring Cost and Reserve [Line Items]            
Restructuring and separation costs   16 1 24   45
2017 Restructuring Plan | Other | Contract Termination Costs            
Restructuring Cost and Reserve [Line Items]            
Restructuring and separation costs   $ 3 $ 0 $ 3   $ 2