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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 |  |

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