Goodwill and Other Intangibles - Narrative (Details) - USD ($) $ in Millions	3 Months Ended				12 Months Ended
	Dec. 31, 2025	Sep. 30, 2025	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Goodwill [Line Items]
Goodwill impairment charge	$ 0		$ 0	$ 0	$ 5,725	$ 0	$ 0
Goodwill	85,478		91,272	$ 91,272	85,478	91,272	91,272
Cumulative goodwill impairments	5,700		$ 6,600		5,700	6,600
Amortization of intangible assets					1,976	$ 2,025	$ 1,905
Health Care Delivery Reporting Unit
Goodwill [Line Items]
Goodwill impairment charge		$ 5,700
Goodwill	$ 4,200				$ 4,200