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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

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