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Investments - Balances of Restricted Investments (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Schedule of Held-to-maturity Securities [Line Items] |  |
Restricted investments | $ 136 | $ 79
Magellan Complete Care |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Restricted investments | 49 | 0
Florida |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Restricted investments | 12 | 12
New Mexico |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Restricted investments | 21 | 21
New York |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Restricted investments | 14 | 9
Ohio |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Restricted investments | 16 | 12
Other |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Restricted investments | $ 24 | $ 25

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