Acquisitions (Narrative) (Details) - USD ($) $ in Millions			3 Months Ended		6 Months Ended
	Jul. 01, 2023	Jul. 01, 2022	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Business Acquisition [Line Items]
Goodwill			$ 16,322		$ 16,322		$ 16,228
Other intangible assets			5,320		5,320		5,441
Repurchase agreements			1,518		1,518		$ 1,419
Cigna integration expenses			15	$ 3	$ 37	$ 3
Huatai Group
Business Acquisition [Line Items]
Equity method investment, outstanding 16.6 percent agreed on					16.60%
Equity method investment, outstanding 3.0 percent requiring regulatory approval					3.00%
Equity method investment, deposits previously paid					$ 464
Equity Method Investment, Outstanding payment to be made			$ 500		$ 500
Cigna's Life Insurance Business in Asia-Pacific Markets [Member]
Business Acquisition [Line Items]
Business Acquisition, Effective Date of Acquisition		Jul. 01, 2022
Payments to Acquire Businesses, Gross		$ 5,400
Goodwill		1,177
Other intangible assets		309
Repurchase agreements		$ 2,000
Direct ownership | Huatai Group
Business Acquisition [Line Items]
Equity method investment, additional 7.1 percentage agreed on	5.40%
Equity Method Investment, Ownership Percentage	69.60%		64.20%		64.20%