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Affordable Care Act - Schedule of Net Receivables (Payables) for Each Program (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Affordable Care Act [Abstract]
Risk adjustment receivable	$ 1,721	$ 1,449
Risk adjustment payable	(2,681)	(2,087)
Minimum medical loss ratio	(285)	(294)
Cost sharing reduction receivable	15	13
Cost sharing reduction payable	$ (15)	$ (15)