Acquisitions (Pro forma) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Business Acquisition [Line Items]
Net premiums earned	$ 49,846	$ 45,712	$ 40,360
Cigna's Life Insurance Business in Asian Markets | Pro Forma
Business Acquisition [Line Items]
Net premiums earned			41,884
Total revenues			44,605
Business Acquisition, Pro Forma Net Income (Loss)			5,533
Huatai Group [Member] | Pro Forma
Business Acquisition [Line Items]
Net premiums earned		46,502	41,903
Total revenues		50,550	44,936
Business Acquisition, Pro Forma Net income (loss), Including Portion Attributable to Noncontrolling Interests		8,850	5,290
Business Acquisition, Pro Forma Net Income (Loss)		$ 8,859	$ 5,267