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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 |  |

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