Medical Claims Payable - Short-Duration Insurance Contracts, Claims Development (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Medical Claims Payable [Line Items]
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
2023
Medical Claims Payable [Line Items]
Cumulative Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	133,879	$ 133,837	$ 135,569
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	133,572	132,853	$ 119,711
2024
Medical Claims Payable [Line Items]
Cumulative Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	124,181	125,513
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	123,352	$ 110,930
Short-Duration Insurance Contract, Accident Year 2025
Medical Claims Payable [Line Items]
Cumulative Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	145,910
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 130,265