Medical Claims Payable - Narrative (Details) claim in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2025 USD ($) claim	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Medical Claims Payable [Line Items]
Prior year claims and claims adjustment expense	$ 1,290	$ 1,731	$ 1,571
2023
Medical Claims Payable [Line Items]
Short-duration insurance contracts, incurred but not reported (IBNR) claims liability, net	$ 307
Short-duration insurance contract, cumulative number of reported claims | claim	538
2024
Medical Claims Payable [Line Items]
Short-duration insurance contracts, incurred but not reported (IBNR) claims liability, net	$ 829
Short-duration insurance contract, cumulative number of reported claims | claim	522
Short-Duration Insurance Contract, Accident Year 2025
Medical Claims Payable [Line Items]
Short-duration insurance contracts, incurred but not reported (IBNR) claims liability, net	$ 15,645
Short-duration insurance contract, cumulative number of reported claims | claim	474