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Significant Accounting Policies - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Property, Plant and Equipment [Line Items] |  |  |
Maturity period (less than) | 15 years |  |
Interest receivable | $ 56 | $ 53 |
Receivables | 3,299 | 3,104 |
Minimum MLR, medical cost corridors and profit sharing liability | $ 1,006 | $ 1,344 |
Percent due to medicare, medical loss ratio | 85.00% | 85.00% |
Government agencies liability | $ 32 | $ 64 |
Percent due to medicare, medical loss ratio of marketplace | 80.00% | 80.00% |
Medical loss ratio of marketplace | $ 30 | $ 2 |
Risk adjustments liability | 115 | 66 |
Risk adjustment payable | 290 | 201 |
Risk adjustment receivable | 192 | 241 |
Risk adjustment, net receivable |  | 40 |
Risk adjustment, credit loss allowances | 41 |  |
Risk adjustment, net payable | 98 |  |
Prepaid reinsurance premiums | 8 | 11 | $ 2
Reinsurance recoveries | 20 | 21 | $ 35
Reinsurance recoverable | 21 | 28 |
Government Receivables |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Receivables | $ 2,223 | $ 2,354 |
CALIFORNIA |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Premium revenue percentage | 10.70% |  |
WASHINGTON |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Premium revenue percentage | 10.40% |  |
TEXAS |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Premium revenue percentage | 10.70% |  |
Minimum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Useful life | 5 years |  |
Minimum | Premium revenue |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Revenue ranging | 1.00% |  |
Maximum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Useful life | 16 years |  |
Maximum | Premium revenue |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Revenue ranging | 4.00% |  |
Structured Securities |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Average maturity period (less than) | 15 years |  |

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