Medical Claims Payable - Reconciliation of Net Incurred Medical Claims to Benefit Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Insurance [Abstract]
Net incurred medical claims with medical claims payable	$ 140,560	$ 123,639	$ 120,227
Performance-based risk arrangements without medical claims payable	3,716	0	0
Total net incurred medical claims	144,276	123,639	120,227
Quality improvement and other claims expense	3,947	3,928	4,103
Net benefit expense	$ 148,223	$ 127,567	$ 124,330