Goodwill and Other Intangibles - Goodwill (Details) $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($)
Goodwill [Roll Forward]
Balance, beginning of the period	$ 78,150
Segment realignment	0
Acquisitions	13,122
Balance, end of the period	91,272
Health Care Benefits
Goodwill [Roll Forward]
Balance, beginning of the period	44,159
Segment realignment	(109)
Acquisitions	2,594
Balance, end of the period	46,644
Health Services
Goodwill [Roll Forward]
Balance, beginning of the period	23,615
Segment realignment	109
Acquisitions	10,342
Balance, end of the period	34,066
Pharmacy & Consumer Wellness
Goodwill [Roll Forward]
Balance, beginning of the period	10,376
Segment realignment	0
Acquisitions	186
Balance, end of the period	$ 10,562