Segment Information - Revenue from External Customers (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Revenue from External Customer [Line Items]
Premiums	$ 11,454	$ 11,039	$ 23,057	$ 22,064
Total revenues from external customers	60,202	48,308	117,167	94,548
Pharmacy revenues
Revenue from External Customer [Line Items]
Revenue from contract with customer	45,101	33,964	87,137	66,108
Service
Revenue from External Customer [Line Items]
Revenue from contract with customer	3,647	3,305	6,973	6,376
Evernorth Health Services
Revenue from External Customer [Line Items]
Total revenues from external customers	48,251	36,721	93,137	71,232
Cigna Healthcare
Revenue from External Customer [Line Items]
Total revenues from external customers	11,821	11,505	23,833	23,155
Other Operations
Revenue from External Customer [Line Items]
Total revenues from external customers	130	82	196	161
Intersegment Eliminations
Revenue from External Customer [Line Items]
Premiums	31	18	55	34
Total revenues from external customers	(2,455)	(2,466)	(4,885)	(5,047)
Intersegment Eliminations | Pharmacy revenues
Revenue from External Customer [Line Items]
Revenue from contract with customer	(1,105)	(1,285)	(2,256)	(2,781)
Intersegment Eliminations | Service
Revenue from External Customer [Line Items]
Revenue from contract with customer	(1,381)	(1,199)	(2,684)	(2,300)
Intersegment Eliminations | Evernorth Health Services
Revenue from External Customer [Line Items]
Total revenues from external customers	(1,232)	(1,422)	(2,513)	(3,040)
Intersegment Eliminations | Cigna Healthcare
Revenue from External Customer [Line Items]
Total revenues from external customers	(1,203)	(1,044)	(2,327)	(2,007)
Intersegment Eliminations | Other Operations
Revenue from External Customer [Line Items]
Total revenues from external customers	(20)	0	(45)	0
Operating Segments | Other revenues
Revenue from External Customer [Line Items]
Revenue from contract with customer	152	63	242	129
Operating Segments | Evernorth Health Services | Pharmacy revenues
Revenue from External Customer [Line Items]
Revenue from contract with customer	46,190	35,249	89,360	68,889
Operating Segments | Evernorth Health Services | Network revenues
Revenue from External Customer [Line Items]
Revenue from contract with customer	25,276	16,406	49,442	32,154
Operating Segments | Evernorth Health Services | Home delivery and specialty revenues
Revenue from External Customer [Line Items]
Revenue from contract with customer	18,017	16,594	34,475	32,619
Operating Segments | Evernorth Health Services | Other revenues
Revenue from External Customer [Line Items]
Revenue from contract with customer	2,897	2,249	5,443	4,116
Operating Segments | Evernorth Health Services | Fees
Revenue from External Customer [Line Items]
Revenue from contract with customer	3,251	2,838	6,194	5,337
Operating Segments | Cigna Healthcare
Revenue from External Customer [Line Items]
Premiums	11,308	10,945	22,839	21,875
Operating Segments | Cigna Healthcare | Fees
Revenue from External Customer [Line Items]
Revenue from contract with customer	1,608	1,602	3,179	3,208
Operating Segments | Cigna Healthcare | U.S. Healthcare
Revenue from External Customer [Line Items]
Premiums	10,417	10,125	21,063	20,269
Operating Segments | Cigna Healthcare | U.S. Healthcare | Employer insured
Revenue from External Customer [Line Items]
Premiums	4,350	4,091	8,743	8,171
Operating Segments | Cigna Healthcare | U.S. Healthcare | Medicare Advantage
Revenue from External Customer [Line Items]
Premiums	2,207	2,180	4,494	4,416
Operating Segments | Cigna Healthcare | U.S. Healthcare | Stop loss
Revenue from External Customer [Line Items]
Premiums	1,665	1,514	3,333	3,017
Operating Segments | Cigna Healthcare | U.S. Healthcare | Individual and Family Plans
Revenue from External Customer [Line Items]
Premiums	975	1,293	2,015	2,501
Operating Segments | Cigna Healthcare | U.S. Healthcare | Other
Revenue from External Customer [Line Items]
Premiums	1,220	1,047	2,478	2,164
Operating Segments | Cigna Healthcare | International Health
Revenue from External Customer [Line Items]
Premiums	891	820	1,776	1,606
Operating Segments | Other Operations
Revenue from External Customer [Line Items]
Premiums	115	76	163	155
Operating Segments | Other Operations | Pharmacy revenues
Revenue from External Customer [Line Items]
Revenue from contract with customer	16	0	33	0
Operating Segments | Other Operations | Fees
Revenue from External Customer [Line Items]
Revenue from contract with customer	$ 17	$ 1	$ 42	$ 2