Health Care Costs Payable - Incurred and Paid Health Care Claims Development (Details) - Health Insurance Product Line - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Claims Development [Line Items]
Incurred Health Care Claims, Net of Reinsurance	$ 226,986
Cumulative Paid Health Care Claims, Net of Reinsurance	214,782
All outstanding liabilities for health care costs payable prior to 2024, net of reinsurance	322
Total outstanding liabilities for health care costs payable, net of reinsurance	12,526
2024
Claims Development [Line Items]
Incurred Health Care Claims, Net of Reinsurance	107,650	$ 109,458
Cumulative Paid Health Care Claims, Net of Reinsurance	107,061	$ 97,155
2025
Claims Development [Line Items]
Incurred Health Care Claims, Net of Reinsurance	119,336
Cumulative Paid Health Care Claims, Net of Reinsurance	$ 107,721