Acquisitions (Narrative) (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
	May 31, 2024	Sep. 30, 2024		Sep. 30, 2024		Dec. 31, 2023	Jul. 01, 2023
Business Acquisition [Line Items]
Goodwill		$ 19,990	[1]	$ 19,990	[1]	$ 19,686
Other intangible assets		$ 6,594		$ 6,594		$ 6,775
Huatai Group
Business Acquisition [Line Items]
Subsidiary, Ownership Percentage, Parent		85.50%		85.50%		76.50%	69.60%
Additional 9.0 percent ownership interest obtained in subsidiary		9.00%
Outstanding 1.6 percent additional ownership interest agreed on		1.60%		1.60%
Huatai Group
Business Acquisition [Line Items]
Equity Method Investment, Ownership Percentage						64.20%
Equity method investing, additional 1.0 percent agreed on		1.00%		1.00%
Huatai Group
Business Acquisition [Line Items]
Payments to Acquire Additional Interest in Subsidiaries				$ 236
Deposits previously paid on additional ownership interest obtained				319
Payment on additional ownership interest obtained, including deposits previously paid				$ 555
Goodwill							$ 3,458
Other intangible assets							$ 1,655
healthy paws
Business Acquisition [Line Items]
Payments to Acquire Businesses, Gross	$ 300
Goodwill	256
Other intangible assets	$ 44

[1] Includes $509 million attributable to noncontrolling interests.