Segment Information - Summarized Segment Financial Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Segment Reporting Information [Line Items]
Revenues from customers	$ 65,264	$ 56,965
Net investment income (loss)	238	290
TOTAL REVENUES	65,502	57,255
Net investment results from certain equity method investments	(50)	(8)
Adjusted revenues	65,452	57,247
Pharmacy and other service costs	48,398	41,431
Medical costs and other benefit expenses	10,498	9,440
Interest expense and other	(362)	(322)
Pre-tax adjusted income (loss) from operations	2,310	2,309
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	1,648	79
Pre-tax adjustments to reconcile to adjusted income from operations
(Income) loss attributable to noncontrolling interests	(102)	(77)
Net realized investment (gains) losses	(48)	1,828
Amortization of acquired intangible assets	422	423
Special items
Integration and transaction-related costs	216	37
Restructuring costs	215	0
(Gain) loss on sale of businesses	(41)	19
Deferred tax expenses	0	0
Pre-tax adjusted income (loss) from operations	2,310	2,309
Depreciation and amortization	674	741
Evernorth Health Services
Segment Reporting Information [Line Items]
Revenues from customers	52,002	44,886
Cigna Healthcare
Segment Reporting Information [Line Items]
Revenues from customers	13,168	12,012
Other Operations
Segment Reporting Information [Line Items]
Revenues from customers	94	66
Operating Segments | Evernorth Health Services
Segment Reporting Information [Line Items]
Net investment income (loss)	31	59
TOTAL REVENUES	53,681	46,226
Net investment results from certain equity method investments	0	0
Adjusted revenues	53,681	46,226
Pharmacy and other service costs	51,121	43,838
Medical costs and other benefit expenses	0	0
Selling, general and administrative expenses	1,024	951
Interest expense and other	0	0
Less: Income attributable to noncontrolling interests	102	77
Pre-tax adjusted income (loss) from operations	1,434	1,360
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	1,108	(436)
Pre-tax adjustments to reconcile to adjusted income from operations
(Income) loss attributable to noncontrolling interests	(102)	(77)
Net realized investment (gains) losses	(4)	1,456
Amortization of acquired intangible assets	415	417
Special items
Integration and transaction-related costs	0	0
Restructuring costs	21
(Gain) loss on sale of businesses	(4)	0
Pre-tax adjusted income (loss) from operations	1,434	1,360
Depreciation and amortization	584	606
Operating Segments | Cigna Healthcare
Segment Reporting Information [Line Items]
Net investment income (loss)	133	149
TOTAL REVENUES	14,532	13,285
Net investment results from certain equity method investments	(50)	(8)
Adjusted revenues	14,482	13,277
Pharmacy and other service costs	0	0
Medical costs and other benefit expenses	10,385	9,219
Selling, general and administrative expenses	2,812	2,720
Interest expense and other	2	2
Less: Income attributable to noncontrolling interests	0	0
Pre-tax adjusted income (loss) from operations	1,287	1,340
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	1,364	943
Pre-tax adjustments to reconcile to adjusted income from operations
(Income) loss attributable to noncontrolling interests	0	0
Net realized investment (gains) losses	(47)	372
Amortization of acquired intangible assets	7	6
Special items
Integration and transaction-related costs	0	0
Restructuring costs	0
(Gain) loss on sale of businesses	(37)	19
Pre-tax adjusted income (loss) from operations	1,287	1,340
Depreciation and amortization	83	124
Operating Segments | Other Operations
Segment Reporting Information [Line Items]
Net investment income (loss)	69	75
TOTAL REVENUES	175	166
Net investment results from certain equity method investments	0	0
Adjusted revenues	175	166
Pre-tax adjusted income (loss) from operations	0	18
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	(20)	18
Pre-tax adjustments to reconcile to adjusted income from operations
(Income) loss attributable to noncontrolling interests	0	0
Net realized investment (gains) losses	3	0
Amortization of acquired intangible assets	0	0
Special items
Integration and transaction-related costs	0	0
Restructuring costs	17
(Gain) loss on sale of businesses	0	0
Pre-tax adjusted income (loss) from operations	0	18
Depreciation and amortization	2	1
Corporate and Eliminations
Segment Reporting Information [Line Items]
TOTAL REVENUES	(2,886)	(2,422)
Adjusted revenues	(2,886)	(2,422)
Special items
Depreciation and amortization	5	10
Corporate
Segment Reporting Information [Line Items]
Revenues from customers	0	1
Net investment income (loss)	5	7
Net investment results from certain equity method investments	0	0
Pre-tax adjusted income (loss) from operations	(411)	(409)
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	(804)	(446)
Pre-tax adjustments to reconcile to adjusted income from operations
(Income) loss attributable to noncontrolling interests	0	0
Net realized investment (gains) losses	0	0
Amortization of acquired intangible assets	0	0
Special items
Integration and transaction-related costs	216	37
Restructuring costs	177
(Gain) loss on sale of businesses	0	0
Pre-tax adjusted income (loss) from operations	(411)	(409)
Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenues from customers	(2,891)	(2,430)
Intersegment Eliminations | Evernorth Health Services
Segment Reporting Information [Line Items]
Revenues from customers	(1,648)	(1,281)
Intersegment Eliminations | Cigna Healthcare
Segment Reporting Information [Line Items]
Revenues from customers	(1,231)	(1,124)
Intersegment Eliminations | Other Operations
Segment Reporting Information [Line Items]
Revenues from customers	$ (12)	$ (25)