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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

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