Acquisitions (Recognized Amounts of Identified Assets Acquired and Liabilities Assumed) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2017
Purchase consideration		$ 841
Goodwill		1,936	$ 1,935	$ 1,694
Optical Communications [Member]
Goodwill		926	931	671
Display Technologies [Member]
Goodwill		132	$ 129	$ 136
Communications Market Division [Member]
Property, plant and equipment		32
Other intangible assets		525
Other net assets		13
Total identified net assets		570
Purchase consideration		841
Goodwill	[1],[2]	$ 271

[1] Property, plant and equipment $ 32 Other intangible assets 525 Other net assets 13 Total identified net assets 570 Purchase consideration 841 Goodwill (1)(2) $ 271 (1)Amounts reflect measurement period adjustments.

[2] The goodwill recognized is deductible for U.S. income tax purposes. The goodwill was allocated to the Optical Communications segment.