Segment Information - Summarized Segment Financial Information (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2023	Dec. 31, 2022		Dec. 31, 2021
Segment Reporting Information [Line Items]
Revenues from customers		$ 194,099	$ 179,363		$ 172,520
Net investment income (loss)		1,166	1,155	[1]	1,549	[1]
TOTAL REVENUES		195,265	180,518	[1]	174,069	[1]
Net realized investment results from certain equity method investments		57	126		0
Adjusted revenues		195,322	180,644		174,069
Depreciation and amortization		3,035	2,937	[1]	2,923	[1]
Income before income taxes		5,513	8,397	[1]	6,790	[1]
Pre-tax adjustments to reconcile to adjusted income from operations
(Income) loss attributable to noncontrolling interests		(146)	(84)		(58)
Net realized investment (gains) losses		135	613		(198)
Amortization of acquired intangible assets		1,819	1,876	[1]	1,998	[1]
Special items
(Gain) loss on sale of business		1,499	(1,662)		0
Charge for organizational efficiency plan	$ 252	252	22		168
(Benefits) charges associated with litigation matters		201	(28)		(27)
Integration and transaction-related costs		45	135		169
Debt extinguishment costs		0	0		141
Pre-tax adjusted income (loss) from operations		9,318	9,269		8,983
Evernorth Health Services
Segment Reporting Information [Line Items]
Revenues from customers		147,588	135,786		127,692
Cigna Healthcare
Segment Reporting Information [Line Items]
Revenues from customers		46,219	41,738		41,369
Other Operations
Segment Reporting Information [Line Items]
Revenues from customers		291	1,839		3,459
Operating Segments | Evernorth Health Services
Segment Reporting Information [Line Items]
Net investment income (loss)		241	86		17
TOTAL REVENUES		153,499	140,335		131,912
Net realized investment results from certain equity method investments		0	0		0
Adjusted revenues		153,499	140,335		131,912
Depreciation and amortization		2,438	2,283		2,316
Income before income taxes		4,768	4,421		3,908
Pre-tax adjustments to reconcile to adjusted income from operations
(Income) loss attributable to noncontrolling interests		(144)	(66)		(31)
Net realized investment (gains) losses		0	0		4
Amortization of acquired intangible assets		1,774	1,772		1,937
Special items
(Gain) loss on sale of business		0	0
Charge for organizational efficiency plan		0	0		0
(Benefits) charges associated with litigation matters		44	0		0
Integration and transaction-related costs		0	0		0
Debt extinguishment costs					0
Pre-tax adjusted income (loss) from operations		6,442	6,127		5,818
Operating Segments | Cigna Healthcare
Segment Reporting Information [Line Items]
Net investment income (loss)		597	638		1,003
TOTAL REVENUES		51,148	44,911		44,643
Net realized investment results from certain equity method investments		57	126		0
Adjusted revenues		51,205	45,037		44,643
Depreciation and amortization		569	638		551
Income before income taxes		2,664	3,470		3,804
Pre-tax adjustments to reconcile to adjusted income from operations
(Income) loss attributable to noncontrolling interests		(2)	(4)		(3)
Net realized investment (gains) losses		133	530		(247)
Amortization of acquired intangible assets		45	103		47
Special items
(Gain) loss on sale of business		1,481	0
Charge for organizational efficiency plan		0	0		0
(Benefits) charges associated with litigation matters		157	0		0
Integration and transaction-related costs		0	0		0
Debt extinguishment costs					0
Pre-tax adjusted income (loss) from operations		4,478	4,099		3,601
Operating Segments | Other Operations
Segment Reporting Information [Line Items]
Net investment income (loss)		305	424		530
TOTAL REVENUES		596	2,263		3,989
Net realized investment results from certain equity method investments		0	0		0
Adjusted revenues		596	2,263		3,989
Depreciation and amortization		3	6		52
Income before income taxes		76	2,101		868
Pre-tax adjustments to reconcile to adjusted income from operations
(Income) loss attributable to noncontrolling interests		0	(14)		(24)
Net realized investment (gains) losses		2	83		45
Amortization of acquired intangible assets		0	1		14
Special items
(Gain) loss on sale of business		18	(1,662)
Charge for organizational efficiency plan		0	0		0
(Benefits) charges associated with litigation matters		0	0		0
Integration and transaction-related costs		0	0		0
Debt extinguishment costs					0
Pre-tax adjusted income (loss) from operations		96	509		903
Corporate and Eliminations
Segment Reporting Information [Line Items]
Net investment income (loss)		23	7		(1)
TOTAL REVENUES		(9,978)	(6,991)		(6,475)
Net realized investment results from certain equity method investments		0	0		0
Adjusted revenues		(9,978)	(6,991)		(6,475)
Depreciation and amortization		25	10		4
Income before income taxes		(1,995)	(1,595)		(1,790)
Special items
Pre-tax adjusted income (loss) from operations		(1,698)	(1,466)		(1,339)
Corporate
Segment Reporting Information [Line Items]
Revenues from customers		1	0		0
Pre-tax adjustments to reconcile to adjusted income from operations
(Income) loss attributable to noncontrolling interests		0	0		0
Net realized investment (gains) losses		0	0		0
Amortization of acquired intangible assets		0	0		0
Special items
(Gain) loss on sale of business		0	0
Charge for organizational efficiency plan		252	22		168
(Benefits) charges associated with litigation matters		0	(28)		(27)
Integration and transaction-related costs		45	135		169
Debt extinguishment costs					141
Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenues from customers		(10,002)	(6,998)		(6,474)
Intersegment Eliminations | Evernorth Health Services
Segment Reporting Information [Line Items]
Revenues from customers		(5,670)	(4,463)		(4,203)
Intersegment Eliminations | Cigna Healthcare
Segment Reporting Information [Line Items]
Revenues from customers		(4,332)	(2,535)		(2,271)
Intersegment Eliminations | Other Operations
Segment Reporting Information [Line Items]
Revenues from customers		$ 0	$ 0		$ 0

[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.