Acquisitions and Divestitures (Summary of Assets Acquired and Liabilities Assumed) (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018	Jan. 31, 2018	Dec. 31, 2017
Business Acquisition [Line Items]
Goodwill	$ 2,839	$ 2,976		$ 2,768
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