Segment Information - Revenue from External Customers (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022		Dec. 31, 2021
Revenue from External Customer [Line Items]
Premiums	$ 44,237	$ 39,916	[1]	$ 41,154	[1]
Total revenues from external customers	194,099	179,363		172,520
Intersegment Eliminations
Revenue from External Customer [Line Items]
Premiums	74	1		(9)
Total revenues from external customers	(10,002)	(6,998)		(6,474)
Operating Segments | Divested International businesses
Revenue from External Customer [Line Items]
Premiums	0	1,596		3,205
Operating Segments | Other
Revenue from External Customer [Line Items]
Premiums	281	225		221
Evernorth Health Services
Revenue from External Customer [Line Items]
Total revenues from external customers	147,588	135,786		127,692
Evernorth Health Services | Intersegment Eliminations
Revenue from External Customer [Line Items]
Total revenues from external customers	(5,670)	(4,463)		(4,203)
Cigna Healthcare
Revenue from External Customer [Line Items]
Total revenues from external customers	46,219	41,738		41,369
Cigna Healthcare | Intersegment Eliminations
Revenue from External Customer [Line Items]
Total revenues from external customers	(4,332)	(2,535)		(2,271)
Cigna Healthcare | Operating Segments
Revenue from External Customer [Line Items]
Premiums	43,882	38,094		37,737
Cigna Healthcare | Operating Segments | U.S. Healthcare
Revenue from External Customer [Line Items]
Premiums	40,587	35,188		35,149
Cigna Healthcare | Operating Segments | International Health
Revenue from External Customer [Line Items]
Premiums	3,295	2,906		2,588
Other Operations
Revenue from External Customer [Line Items]
Total revenues from external customers	291	1,839		3,459
Other Operations | Intersegment Eliminations
Revenue from External Customer [Line Items]
Total revenues from external customers	0	0		0
Pharmacy revenues
Revenue from External Customer [Line Items]
Revenues	137,243	128,566	[1]	121,413	[1]
Pharmacy revenues | Intersegment Eliminations
Revenue from External Customer [Line Items]
Revenues	(5,050)	(4,416)		(4,398)
Network revenues | Operating Segments
Revenue from External Customer [Line Items]
Revenues	67,514	64,946		64,992
Home delivery and specialty revenues | Operating Segments
Revenue from External Customer [Line Items]
Revenues	65,732	61,283		54,391
Other revenues | Operating Segments
Revenue from External Customer [Line Items]
Revenues	9,047	6,753		6,428
Employer insured | Cigna Healthcare | Operating Segments | U.S. Healthcare
Revenue from External Customer [Line Items]
Premiums	16,490	15,199		14,315
Medicare Advantage | Cigna Healthcare | Operating Segments | U.S. Healthcare
Revenue from External Customer [Line Items]
Premiums	8,771	7,896		8,362
Stop loss | Cigna Healthcare | Operating Segments | U.S. Healthcare
Revenue from External Customer [Line Items]
Premiums	6,143	5,461		4,868
Individual and Family Plans | Cigna Healthcare | Operating Segments | U.S. Healthcare
Revenue from External Customer [Line Items]
Premiums	5,088	2,636		2,528
Other | Cigna Healthcare | Operating Segments | U.S. Healthcare
Revenue from External Customer [Line Items]
Premiums	4,095	3,996		5,076
Service
Revenue from External Customer [Line Items]
Revenues	12,619	10,881	[1]	9,953	[1]
Service | Intersegment Eliminations
Revenue from External Customer [Line Items]
Revenues	(5,026)	(2,583)		(2,067)
Fees | Evernorth Health Services | Operating Segments
Revenue from External Customer [Line Items]
Revenues	10,866	7,234		6,070
Fees | Cigna Healthcare | Operating Segments
Revenue from External Customer [Line Items]
Revenues	6,566	6,053		5,743
Fees | Other Operations | Operating Segments
Revenue from External Customer [Line Items]
Revenues	3	9		19
Other revenues | Operating Segments
Revenue from External Customer [Line Items]
Revenues	$ 210	$ 168		$ 188

[1] Amounts have been restated to reflect the adoption of Targeted Improvements to the Accounting for Long-Duration Contracts in 2023. See Note 2 to the Consolidated Financial Statements for further information.