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Significant Accounting Policies - Narrative (Details) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2025 | Dec. 31, 2024
Property, Plant and Equipment [Line Items] |  |
Receivables | $ 3,515 | $ 3,299
Minimum MLR, medical cost corridors and profit sharing liability | $ 641 | $ 1,006
Percent due to medicare, medical loss ratio | 85.00% | 85.00%
Government agencies liability | $ 38 | $ 32
Percent due to medicare, medical loss ratio of marketplace | 80.00% | 80.00%
Medical loss ratio of marketplace | $ 18 | $ 30
Risk adjustments liability | 128 | 115
Risk adjustment receivable (payable) | (353) | (290)
Risk adjustment receivable | 183 | 192
Risk adjustment, net receivable (payable) | $ (170) | (98)
Maturity period (less than) | 15 years |
Structured Securities |  |
Property, Plant and Equipment [Line Items] |  |
Average maturity period (less than) | 15 years |
Government Receivables |  |
Property, Plant and Equipment [Line Items] |  |
Receivables | $ 2,241 | $ 2,223

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