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Organization and Basis of Presentation (Details) member in Millions, $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 USD ($) member state | Sep. 30, 2020 USD ($) | Dec. 31, 2020 USD ($) member Segment state | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Basis Of Presentation [Line Items] |  |  |  |  |
Number of reportable segments | Segment |  |  | 2 |  |
Number of states for operated health plans | state | 15 |  | 15 |  |
Net cash paid in business combinations |  |  | $ 755 | $ 0 | $ 0
Health Plans |  |  |  |  |
Basis Of Presentation [Line Items] |  |  |  |  |
Number of served members | member | 4.0 |  | 4.0 |  |
Number of members eligible for the health care programs, approximately | member | 0.2 |  | 0.2 |  |
Health Plans | Minimum |  |  |  |  |
Basis Of Presentation [Line Items] |  |  |  |  |
Contract term |  |  | 3 years |  |
Health Plans | Maximum |  |  |  |  |
Basis Of Presentation [Line Items] |  |  |  |  |
Contract term |  |  | 5 years |  |
Magellan Complete Care |  |  |  |  |
Basis Of Presentation [Line Items] |  |  |  |  |
Number of states for operated health plans | state | 18 |  | 18 |  |
Ownership percentage | 100.00% |  | 100.00% |  |
Net cash paid in business combinations | $ 1,037 |  |  |  |
Affinity Health Plan |  |  |  |  |
Basis Of Presentation [Line Items] |  |  |  |  |
Net cash paid in business combinations |  | $ 380 |  |  |

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