Acquisitions and Divestitures (Summary of Assets Acquired and Liabilities Assumed) (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Jan. 31, 2018
Business Acquisition [Line Items]
Goodwill	$ 2,854	$ 2,839	$ 2,976
Pure
Business Acquisition [Line Items]
Cash				$ 14
Receivables				23
Inventories				4
Prepaid and other current assets				2
Property, plant and equipment				22
Intangible assets				149
Other long-term assets				1
Accounts payable				(3)
Accrued and other current liabilities				(12)
Deferred income tax liabilities				(25)
Other non-current accrued liabilities				(2)
Total identifiable net assets				173
Goodwill				261
Total consideration				$ 434