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Significant Accounting Policies - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2020
Schedule of Premium Revenue by Health Plan Type [Line Items] |  |  |  |
Risk adjustment payable | $ 691 | $ 691 | $ 326 |
Risk adjustment receivable | 29 | 29 | 20 |
Risk adjustment, net payable | 662 | 662 | $ 306 |
Risk adjustment, net payable, current year | (660) | $ (660) |  |
Risk adjustment, net payable, prior year |  |  |  | $ (2)
Maturity period (less than) |  | 10 years |  |
Structured Securities |  |  |  |
Schedule of Premium Revenue by Health Plan Type [Line Items] |  |  |  |
Average maturity period (less than) |  | 10 years |  |
COVID-19 |  |  |  |
Schedule of Premium Revenue by Health Plan Type [Line Items] |  |  |  |
Reduction in premiums | $ 17 | $ 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 http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 + Details
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