Segment Information - Summarized Segment Financial Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Segment Reporting Information [Line Items]
Revenues from customers	$ 60,202	$ 48,308	$ 117,167	$ 94,548
Net investment income (loss)	321	278	611	555
TOTAL REVENUES	60,523	48,586	117,778	95,103
Net realized investment results from certain equity method investments	(53)	30	(61)	(8)
Adjusted revenues	60,470	48,616	117,717	95,095
Depreciation and amortization			1,479	1,504
Income before income taxes	1,989	1,884	2,068	3,485
Pre-tax adjustments to reconcile to adjusted income from operations
(Income) loss attributable to noncontrolling interests	(95)	(55)	(172)	(98)
Net realized investment (gains) losses	(5)	4	1,823	22
Amortization of acquired intangible assets	420	455	843	914
Special items
Integration and transaction-related costs	63	6	100	7
(Gain) loss on sale of business	0	0	19	0
Pre-tax adjusted income (loss) from operations	2,372	2,294	4,681	4,330
Evernorth Health Services
Segment Reporting Information [Line Items]
Revenues from customers	48,251	36,721	93,137	71,232
Cigna Healthcare
Segment Reporting Information [Line Items]
Revenues from customers	11,821	11,505	23,833	23,155
Other Operations
Segment Reporting Information [Line Items]
Revenues from customers	130	82	196	161
Operating Segments | Evernorth Health Services
Segment Reporting Information [Line Items]
Net investment income (loss)	65	62	124	112
TOTAL REVENUES	49,548	38,205	95,774	74,384
Net realized investment results from certain equity method investments	0	0	0	0
Adjusted revenues	49,548	38,205	95,774	74,384
Income before income taxes	1,299	1,128	863	2,046
Pre-tax adjustments to reconcile to adjusted income from operations
(Income) loss attributable to noncontrolling interests	(95)	(54)	(172)	(96)
Net realized investment (gains) losses	(1)	(1)	1,455	(1)
Amortization of acquired intangible assets	416	443	833	887
Special items
Integration and transaction-related costs	0	0	0	0
(Gain) loss on sale of business			0
Pre-tax adjusted income (loss) from operations	1,619	1,516	2,979	2,836
Operating Segments | Cigna Healthcare
Segment Reporting Information [Line Items]
Net investment income (loss)	172	135	321	278
TOTAL REVENUES	13,196	12,684	26,481	25,440
Net realized investment results from certain equity method investments	(53)	30	(61)	(8)
Adjusted revenues	13,143	12,714	26,420	25,432
Income before income taxes	1,205	1,156	2,148	2,233
Pre-tax adjustments to reconcile to adjusted income from operations
(Income) loss attributable to noncontrolling interests	0	(1)	0	(2)
Net realized investment (gains) losses	(5)	5	367	29
Amortization of acquired intangible assets	4	12	10	27
Special items
Integration and transaction-related costs	0	0	0	0
(Gain) loss on sale of business			19
Pre-tax adjusted income (loss) from operations	1,204	1,172	2,544	2,287
Operating Segments | Other Operations
Segment Reporting Information [Line Items]
Net investment income (loss)	77	76	152	154
TOTAL REVENUES	227	158	393	315
Net realized investment results from certain equity method investments	0	0	0	0
Adjusted revenues	227	158	393	315
Income before income taxes	(17)	29	1	50
Pre-tax adjustments to reconcile to adjusted income from operations
(Income) loss attributable to noncontrolling interests	0	0	0	0
Net realized investment (gains) losses	1	0	1	(6)
Amortization of acquired intangible assets	0	0	0	0
Special items
Integration and transaction-related costs	0	0	0	0
(Gain) loss on sale of business			0
Pre-tax adjusted income (loss) from operations	(16)	29	2	44
Corporate and Eliminations
Segment Reporting Information [Line Items]
TOTAL REVENUES	(2,448)	(2,461)	(4,870)	(5,036)
Adjusted revenues	(2,448)	(2,461)	(4,870)	(5,036)
Corporate
Segment Reporting Information [Line Items]
Revenues from customers	0	0	1	0
Net investment income (loss)	7	5	14	11
Net realized investment results from certain equity method investments	0	0	0	0
Income before income taxes	(498)	(429)	(944)	(844)
Pre-tax adjustments to reconcile to adjusted income from operations
(Income) loss attributable to noncontrolling interests	0	0	0	0
Net realized investment (gains) losses	0	0	0	0
Amortization of acquired intangible assets	0	0	0	0
Special items
Integration and transaction-related costs	63	6	100	7
(Gain) loss on sale of business			0
Pre-tax adjusted income (loss) from operations	(435)	(423)	(844)	(837)
Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenues from customers	(2,455)	(2,466)	(4,885)	(5,047)
Intersegment Eliminations | Evernorth Health Services
Segment Reporting Information [Line Items]
Revenues from customers	(1,232)	(1,422)	(2,513)	(3,040)
Intersegment Eliminations | Cigna Healthcare
Segment Reporting Information [Line Items]
Revenues from customers	(1,203)	(1,044)	(2,327)	(2,007)
Intersegment Eliminations | Other Operations
Segment Reporting Information [Line Items]
Revenues from customers	$ (20)	$ 0	$ (45)	$ 0