Health Care Costs Payable - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Liability for Claims and Claims Adjustment Expense [Line Items]
Decrease in prior years' healthcare costs payable	$ 1,982	$ 947	$ 685
Health Care Benefits
Liability for Claims and Claims Adjustment Expense [Line Items]
Liabilities for IBNR plus expected development on reported claims	$ 10,400