Segment Information - Summarized Segment Financial Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Segment Reporting Information [Line Items]
Revenues from customers	$ 66,942	$ 60,202	$ 132,206	$ 117,167
Net investment income (loss)	236	321	474	611
TOTAL REVENUES	67,178	60,523	132,680	117,778
Net investment results from certain equity method investments	(44)	(53)	(94)	(61)
Adjusted revenues	67,134	60,470	132,586	117,717
Pharmacy and other service costs	53,268	44,492	101,666	85,923
Medical costs and other benefit expenses	7,749	9,515	18,247	18,955
Interest expense and other	(337)	(375)	(699)	(697)
Pre-tax adjusted income (loss) from operations	2,433	2,372	4,743	4,681
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	2,021	1,989	3,669	2,068
Pre-tax adjustments to reconcile to adjusted income from operations
(Income) loss attributable to noncontrolling interests	(117)	(95)	(219)	(172)
Net realized investment (gains) losses	(96)	(5)	(144)	1,823
Amortization of acquired intangible assets	422	420	844	843
Special items
Integration and transaction-related costs	74	63	290	100
Restructuring costs	129	0	344	0
(Gain) loss on sale of businesses	0	0	(41)	19
Deferred tax expenses	0	0	0	0
Pre-tax adjusted income (loss) from operations	2,433	2,372	4,743	4,681
Depreciation and amortization	682	738	1,356	1,479
Evernorth Health Services
Segment Reporting Information [Line Items]
Revenues from customers	57,486	48,251	109,488	93,137
Cigna Healthcare
Segment Reporting Information [Line Items]
Revenues from customers	9,358	11,821	22,526	23,833
Other Operations
Segment Reporting Information [Line Items]
Revenues from customers	98	130	192	196
Operating Segments | Evernorth Health Services
Segment Reporting Information [Line Items]
Net investment income (loss)	31	65	62	124
TOTAL REVENUES	57,825	49,548	111,506	95,774
Net investment results from certain equity method investments	0	0	0	0
Adjusted revenues	57,825	49,548	111,506	95,774
Pharmacy and other service costs	54,939	46,852	106,060	90,690
Medical costs and other benefit expenses	0	0	0	0
Selling, general and administrative expenses	1,074	980	2,098	1,931
Interest expense and other	1	(2)	1	(2)
Less: Income attributable to noncontrolling interests	117	95	219	172
Pre-tax adjusted income (loss) from operations	1,696	1,619	3,130	2,979
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	1,430	1,299	2,538	863
Pre-tax adjustments to reconcile to adjusted income from operations
(Income) loss attributable to noncontrolling interests	(117)	(95)	(219)	(172)
Net realized investment (gains) losses	(80)	(1)	(84)	1,455
Amortization of acquired intangible assets	416	416	831	833
Special items
Integration and transaction-related costs	0	0	0	0
Restructuring costs	47		68
(Gain) loss on sale of businesses			(4)	0
Pre-tax adjusted income (loss) from operations	1,696	1,619	3,130	2,979
Depreciation and amortization	587	614	1,171	1,220
Operating Segments | Cigna Healthcare
Segment Reporting Information [Line Items]
Net investment income (loss)	127	172	260	321
TOTAL REVENUES	10,798	13,196	25,330	26,481
Net investment results from certain equity method investments	(44)	(53)	(94)	(61)
Adjusted revenues	10,754	13,143	25,236	26,420
Pharmacy and other service costs	0	0	0	0
Medical costs and other benefit expenses	7,482	9,312	17,867	18,531
Selling, general and administrative expenses	2,180	2,629	4,992	5,349
Interest expense and other	2	2	4	4
Less: Income attributable to noncontrolling interests	0	0	0	0
Pre-tax adjusted income (loss) from operations	1,094	1,204	2,381	2,544
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	1,098	1,205	2,462	2,148
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	(20)	(5)	(67)	367
Amortization of acquired intangible assets	6	4	13	10
Special items
Integration and transaction-related costs	0	0	0	0
Restructuring costs	10		10
(Gain) loss on sale of businesses			(37)	19
Pre-tax adjusted income (loss) from operations	1,094	1,204	2,381	2,544
Depreciation and amortization	81	113	164	237
Operating Segments | Other Operations
Segment Reporting Information [Line Items]
Net investment income (loss)	73	77	142	152
TOTAL REVENUES	184	227	359	393
Net investment results from certain equity method investments	0	0	0	0
Adjusted revenues	184	227	359	393
Pre-tax adjusted income (loss) from operations	25	(16)	25	2
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	(20)	(17)	(40)	1
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	4	1	7	1
Amortization of acquired intangible assets	0	0	0	0
Special items
Integration and transaction-related costs	0	0	0	0
Restructuring costs	41		58
(Gain) loss on sale of businesses			0	0
Pre-tax adjusted income (loss) from operations	25	(16)	25	2
Depreciation and amortization	9	2	11	3
Corporate and Eliminations
Segment Reporting Information [Line Items]
TOTAL REVENUES	(1,629)	(2,448)	(4,515)	(4,870)
Adjusted revenues	(1,629)	(2,448)	(4,515)	(4,870)
Special items
Depreciation and amortization	5	9	10	19
Corporate
Segment Reporting Information [Line Items]
Revenues from customers	0	0	0	1
Net investment income (loss)	5	7	10	14
Net investment results from certain equity method investments	0	0	0	0
Pre-tax adjusted income (loss) from operations	(382)	(435)	(793)	(844)
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	(487)	(498)	(1,291)	(944)
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	74	63	290	100
Restructuring costs	31		208
(Gain) loss on sale of businesses			0	0
Pre-tax adjusted income (loss) from operations	(382)	(435)	(793)	(844)
Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenues from customers	(1,634)	(2,455)	(4,525)	(4,885)
Intersegment Eliminations | Evernorth Health Services
Segment Reporting Information [Line Items]
Revenues from customers	(308)	(1,232)	(1,956)	(2,513)
Intersegment Eliminations | Cigna Healthcare
Segment Reporting Information [Line Items]
Revenues from customers	(1,313)	(1,203)	(2,544)	(2,327)
Intersegment Eliminations | Other Operations
Segment Reporting Information [Line Items]
Revenues from customers	$ (13)	$ (20)	$ (25)	$ (45)