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Significant Accounting Policies - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021 | Dec. 31, 2021
Schedule of Premium Revenue by Health Plan Type [Line Items] |  |  |  |  |
Risk adjustment payable | $ 179 |  | $ 179 |  | $ 902
Risk adjustment receivable | 94 |  | 94 |  | 7
Risk adjustment, net payable | 85 |  | $ 85 |  | $ 895
Maturity period (less than) |  |  | 15 years |  |
Structured Securities |  |  |  |  |
Schedule of Premium Revenue by Health Plan Type [Line Items] |  |  |  |  |
Average maturity period (less than) |  |  | 15 years |  |
COVID-19 |  |  |  |  |
Schedule of Premium Revenue by Health Plan Type [Line Items] |  |  |  |  |
Reduction in premiums | $ 34 | $ 17 | $ 156 | $ 183 |

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- Definition The change in the premium receivable balance on the balance sheet. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3602-108585 + Details
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