Goodwill and Other Intangibles - Goodwill (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Goodwill [Roll Forward]
Balance, beginning of the period	$ 78,150	$ 79,121
Segment realignment	0
Acquisitions	13,122
Balance, end of the period	91,272	78,150
Disposal Group, Disposed of by Sale, Not Discontinued Operations
Goodwill [Roll Forward]
Divestitures		(971)
Health Care Benefits
Goodwill [Roll Forward]
Balance, beginning of the period	44,159	45,130
Segment realignment	(109)
Acquisitions	2,594
Balance, end of the period	46,644	44,159
Health Care Benefits | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Goodwill [Roll Forward]
Divestitures		(971)
Health Services
Goodwill [Roll Forward]
Balance, beginning of the period	23,615	23,615
Segment realignment	109
Acquisitions	10,342
Balance, end of the period	34,066	23,615
Health Services | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Goodwill [Roll Forward]
Divestitures		0
Pharmacy & Consumer Wellness
Goodwill [Roll Forward]
Balance, beginning of the period	10,376	10,376
Segment realignment	0
Acquisitions	186
Balance, end of the period	$ 10,562	10,376
Pharmacy & Consumer Wellness | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Goodwill [Roll Forward]
Divestitures		$ 0