Segment Information - Revenue from External Customers (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Revenue from External Customer [Line Items]
Premiums	$ 12,736	$ 11,603
Total revenues from external customers	65,264	56,965
Pharmacy revenues
Revenue from External Customer [Line Items]
Revenue from contract with customer	48,633	42,036
Service
Revenue from External Customer [Line Items]
Revenue from contract with customer	3,895	3,326
Service, Fees And Other Revenues [Member]
Revenue from External Customer [Line Items]
Revenue from contract with customer	3,895	3,326
Evernorth Health Services
Revenue from External Customer [Line Items]
Total revenues from external customers	52,002	44,886
Cigna Healthcare
Revenue from External Customer [Line Items]
Total revenues from external customers	13,168	12,012
Other Operations
Revenue from External Customer [Line Items]
Total revenues from external customers	94	66
Operating Segments | Other revenue
Revenue from External Customer [Line Items]
Revenue from contract with customer	162	90
Operating Segments | Evernorth Health Services | Pharmacy revenues
Revenue from External Customer [Line Items]
Revenue from contract with customer	50,226	43,170
Operating Segments | Evernorth Health Services | Network revenues
Revenue from External Customer [Line Items]
Revenue from contract with customer	28,212	24,166
Operating Segments | Evernorth Health Services | Home delivery and specialty revenues
Revenue from External Customer [Line Items]
Revenue from contract with customer	18,937	16,458
Operating Segments | Evernorth Health Services | Other revenues
Revenue from External Customer [Line Items]
Revenue from contract with customer	3,077	2,546
Operating Segments | Evernorth Health Services | Service, Fees And Other Revenues [Member]
Revenue from External Customer [Line Items]
Revenue from contract with customer	3,424	2,997
Operating Segments | Cigna Healthcare
Revenue from External Customer [Line Items]
Premiums	12,628	11,531
Operating Segments | Cigna Healthcare | Service, Fees And Other Revenues [Member]
Revenue from External Customer [Line Items]
Revenue from contract with customer	1,771	1,605
Operating Segments | Cigna Healthcare | U.S. Healthcare
Revenue from External Customer [Line Items]
Premiums	11,650	10,646
Operating Segments | Cigna Healthcare | U.S. Healthcare | Employer insured
Revenue from External Customer [Line Items]
Premiums	4,688	4,393
Operating Segments | Cigna Healthcare | U.S. Healthcare | Medicare Advantage
Revenue from External Customer [Line Items]
Premiums	2,363	2,287
Operating Segments | Cigna Healthcare | U.S. Healthcare | Stop loss
Revenue from External Customer [Line Items]
Premiums	1,868	1,668
Operating Segments | Cigna Healthcare | U.S. Healthcare | Individual and Family Plans
Revenue from External Customer [Line Items]
Premiums	859	1,040
Operating Segments | Cigna Healthcare | U.S. Healthcare | Other
Revenue from External Customer [Line Items]
Premiums	1,872	1,258
Operating Segments | Cigna Healthcare | International Health
Revenue from External Customer [Line Items]
Premiums	978	885
Operating Segments | Other Operations
Revenue from External Customer [Line Items]
Premiums	81	48
Operating Segments | Other Operations | Pharmacy revenues
Revenue from External Customer [Line Items]
Revenue from contract with customer	13	17
Operating Segments | Other Operations | Service, Fees And Other Revenues [Member]
Revenue from External Customer [Line Items]
Revenue from contract with customer	12	26
Corporate and Eliminations
Revenue from External Customer [Line Items]
Premiums	27	24
Corporate and Eliminations | Pharmacy revenues
Revenue from External Customer [Line Items]
Revenue from contract with customer	(1,606)	(1,151)
Corporate and Eliminations | Service, Fees And Other Revenues [Member]
Revenue from External Customer [Line Items]
Revenue from contract with customer	(1,312)	(1,302)
Corporate
Revenue from External Customer [Line Items]
Total revenues from external customers	0	1
Intersegment Eliminations
Revenue from External Customer [Line Items]
Total revenues from external customers	(2,891)	(2,430)
Intersegment Eliminations | Evernorth Health Services
Revenue from External Customer [Line Items]
Total revenues from external customers	(1,648)	(1,281)
Intersegment Eliminations | Cigna Healthcare
Revenue from External Customer [Line Items]
Total revenues from external customers	(1,231)	(1,124)
Intersegment Eliminations | Other Operations
Revenue from External Customer [Line Items]
Total revenues from external customers	$ (12)	$ (25)