Segment Information - Revenue from External Customers (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Revenue from External Customer [Line Items]
Premiums	$ 11,603	$ 11,025
Total revenues from external customers	56,965	46,240
Pharmacy revenues
Revenue from External Customer [Line Items]
Revenues	42,036	32,144
Service
Revenue from External Customer [Line Items]
Revenues	3,326	3,071
Evernorth Health Services
Revenue from External Customer [Line Items]
Total revenues from external customers	44,886	34,511
Cigna Healthcare
Revenue from External Customer [Line Items]
Total revenues from external customers	12,012	11,650
Other Operations
Revenue from External Customer [Line Items]
Total revenues from external customers	66	79
Intersegment Eliminations
Revenue from External Customer [Line Items]
Premiums	24	16
Total revenues from external customers	(2,430)	(2,581)
Intersegment Eliminations | Pharmacy revenues
Revenue from External Customer [Line Items]
Revenues	(1,151)	(1,496)
Intersegment Eliminations | Service
Revenue from External Customer [Line Items]
Revenues	(1,303)	(1,101)
Intersegment Eliminations | Evernorth Health Services
Revenue from External Customer [Line Items]
Total revenues from external customers	(1,281)	(1,618)
Intersegment Eliminations | Cigna Healthcare
Revenue from External Customer [Line Items]
Total revenues from external customers	(1,124)	(963)
Intersegment Eliminations | Other Operations
Revenue from External Customer [Line Items]
Total revenues from external customers	(25)	0
Operating Segments | Other revenues
Revenue from External Customer [Line Items]
Revenues	90	66
Operating Segments | Evernorth Health Services | Pharmacy revenues
Revenue from External Customer [Line Items]
Revenues	43,170	33,640
Operating Segments | Evernorth Health Services | Network revenues
Revenue from External Customer [Line Items]
Revenues	24,166	15,748
Operating Segments | Evernorth Health Services | Home delivery and specialty revenues
Revenue from External Customer [Line Items]
Revenues	16,458	16,025
Operating Segments | Evernorth Health Services | Other revenues
Revenue from External Customer [Line Items]
Revenues	2,546	1,867
Operating Segments | Evernorth Health Services | Fees
Revenue from External Customer [Line Items]
Revenues	2,943	2,499
Operating Segments | Cigna Healthcare
Revenue from External Customer [Line Items]
Premiums	11,531	10,930
Operating Segments | Cigna Healthcare | Fees
Revenue from External Customer [Line Items]
Revenues	1,571	1,606
Operating Segments | Cigna Healthcare | U.S. Healthcare
Revenue from External Customer [Line Items]
Premiums	10,646	10,144
Operating Segments | Cigna Healthcare | U.S. Healthcare | Employer insured
Revenue from External Customer [Line Items]
Premiums	4,393	4,080
Operating Segments | Cigna Healthcare | U.S. Healthcare | Medicare Advantage
Revenue from External Customer [Line Items]
Premiums	2,287	2,236
Operating Segments | Cigna Healthcare | U.S. Healthcare | Stop loss
Revenue from External Customer [Line Items]
Premiums	1,668	1,503
Operating Segments | Cigna Healthcare | U.S. Healthcare | Individual and Family Plans
Revenue from External Customer [Line Items]
Premiums	1,040	1,208
Operating Segments | Cigna Healthcare | U.S. Healthcare | Other
Revenue from External Customer [Line Items]
Premiums	1,258	1,117
Operating Segments | Cigna Healthcare | International Health
Revenue from External Customer [Line Items]
Premiums	885	786
Operating Segments | Other Operations
Revenue from External Customer [Line Items]
Premiums	48	79
Operating Segments | Other Operations | Pharmacy revenues
Revenue from External Customer [Line Items]
Revenues	17	0
Operating Segments | Other Operations | Fees
Revenue from External Customer [Line Items]
Revenues	$ 25	$ 1