Summary of Significant Accounting Policies and Implementation of New Financial Accounting Standard (Narrative) (Details) - USD ($) $ in Billions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Mar. 11, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Advertising expense	$ 1.2	$ 1.1	$ 1.1
Advertising expense, percentage of revenue	5.00%	5.00%	5.00%
Discontinued Operations, Disposed of by Sale | Elanco | Eli Lilly and Company
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposition of ownership interest				80.20%