Segment Information - Revenue from External Customers (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Revenue from External Customer [Line Items]
Premiums	$ 39,915	$ 41,154	$ 42,627
Total revenues from external customers	179,361	172,529	159,157
Intersegment Eliminations
Revenue from External Customer [Line Items]
Premiums	1	(9)	(28)
Total revenues from external customers	(6,998)	(6,474)	(5,644)
Operating Segments | Divested International businesses
Revenue from External Customer [Line Items]
Premiums	1,596	3,205	3,039
Operating Segments | Group Disability and Life
Revenue from External Customer [Line Items]
Premiums	0	0	4,423
Operating Segments | Other
Revenue from External Customer [Line Items]
Premiums	224	221	124
Evernorth Health Services
Revenue from External Customer [Line Items]
Total revenues from external customers	135,786	127,692	112,647
Evernorth Health Services | Intersegment Eliminations
Revenue from External Customer [Line Items]
Total revenues from external customers	(4,463)	(4,203)	(3,655)
Cigna Healthcare
Revenue from External Customer [Line Items]
Total revenues from external customers	41,737	41,378	38,826
Cigna Healthcare | Intersegment Eliminations
Revenue from External Customer [Line Items]
Total revenues from external customers	(2,535)	(2,271)	(1,966)
Other Operations
Revenue from External Customer [Line Items]
Total revenues from external customers	1,838	3,459	7,684
Other Operations | Intersegment Eliminations
Revenue from External Customer [Line Items]
Total revenues from external customers	0	0	(23)
Pharmacy revenues
Revenue from External Customer [Line Items]
Revenues	128,566	121,413	107,769
Pharmacy revenues | Intersegment Eliminations
Revenue from External Customer [Line Items]
Revenues	(4,416)	(4,398)	(3,905)
Network revenues | Operating Segments
Revenue from External Customer [Line Items]
Revenues	64,946	64,992	56,365
Home delivery and specialty revenues | Operating Segments
Revenue from External Customer [Line Items]
Revenues	61,283	54,391	49,906
Other revenues | Operating Segments
Revenue from External Customer [Line Items]
Revenues	6,753	6,428	5,403
Cigna Healthcare | Cigna Healthcare | Operating Segments
Revenue from External Customer [Line Items]
Premiums	38,094	37,737	35,069
Insured | Cigna Healthcare | Operating Segments
Revenue from External Customer [Line Items]
Premiums	15,199	14,315	13,389
Stop loss | Cigna Healthcare | Operating Segments
Revenue from External Customer [Line Items]
Premiums	5,461	4,868	4,614
Other | Cigna Healthcare | Operating Segments
Revenue from External Customer [Line Items]
Premiums	1,418	1,290	1,135
Medicare Advantage | Cigna Healthcare | Operating Segments
Revenue from External Customer [Line Items]
Premiums	7,896	8,362	7,565
Medicare Part D | Cigna Healthcare | Operating Segments
Revenue from External Customer [Line Items]
Premiums	1,224	1,499	1,593
Other | Cigna Healthcare | Operating Segments
Revenue from External Customer [Line Items]
Premiums	3,990	4,815	4,301
International Health | Cigna Healthcare | Operating Segments
Revenue from External Customer [Line Items]
Premiums	2,906	2,588	2,472
Total fees and other revenues
Revenue from External Customer [Line Items]
Revenues	10,880	9,962	8,761
Total fees and other revenues | Intersegment Eliminations
Revenue from External Customer [Line Items]
Revenues	(2,583)	(2,067)	(1,711)
Fees | Evernorth Health Services | Operating Segments
Revenue from External Customer [Line Items]
Revenues	7,234	6,070	4,611
Fees | Cigna Healthcare | Operating Segments
Revenue from External Customer [Line Items]
Revenues	6,053	5,743	5,491
Fees | Other Operations | Operating Segments
Revenue from External Customer [Line Items]
Revenues	9	19	116
Other revenues | Operating Segments
Revenue from External Customer [Line Items]
Revenues	$ 167	$ 197	$ 254