Medical Claims Payables - Reconciliation of Short Duration Medical Claims Payable to the Consolidated Medical Claims Payable (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Insurance [Abstract]
Cumulative Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 403,970
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	387,189
Net medical claims payable, end of year	16,781
Ceded medical claims payable, end of year	48
Insurance lines other than short duration	255
Gross medical claims payable, end of year	$ 17,084	$ 15,746