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Investments - Balances of Restricted Investments (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Schedule of Held-to-maturity Securities [Line Items] |  |
Restricted investments | $ 212 | $ 136
Magellan Complete Care acquisition opening balance |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Restricted investments | 0 | 49
Cash and cash equivalents |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Restricted investments | 68 | 63
U.S. Treasury notes |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Restricted investments | $ 144 | $ 24

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