Acquisitions (Pro forma) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Business Acquisition [Line Items]
Net premiums earned	$ 12,674	$ 11,530	$ 33,815	$ 29,816
Cigna's Life Insurance Business in Asia-Pacific Markets [Member] | Pro Forma
Business Acquisition [Line Items]
Net premiums earned		11,530		31,341
Total revenues		12,124		33,161
Business Acquisition, Pro Forma Net Income (Loss)		837		4,172
Huatai Group | Pro Forma
Business Acquisition [Line Items]
Net premiums earned	12,674	11,952	34,605	30,996
Total revenues	13,755	12,612	37,589	33,019
Business Acquisition, Pro Forma Net income (loss), Including Portion Attributable to Noncontrolling Interests	1,905	787	5,595	3,975
Business Acquisition, Pro Forma Net Income (Loss)	$ 1,912	$ 777	$ 5,587	$ 3,935