Segment Reporting (Long-Lived Assets By Segment) (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Total property, plant and equipment, net and Other assets	$ 8,602	$ 8,646	$ 9,195
Operating Segments [Member]
Segment Reporting Information [Line Items]
Long-lived assets	8,086	7,982	8,069
Operating Segments [Member] | European Union [Member]
Segment Reporting Information [Line Items]
Long-lived assets	4,275	4,216	4,130
Operating Segments [Member] | Eastern Europe [Member]
Segment Reporting Information [Line Items]
Long-lived assets	774	547	546
Operating Segments [Member] | Middle East And Africa [Member]
Segment Reporting Information [Line Items]
Long-lived assets	369	362	430
Operating Segments [Member] | South & Southeast Asia [Member]
Segment Reporting Information [Line Items]
Long-lived assets	1,361	1,297	1,419
Operating Segments [Member] | East Asia And Australia [Member]
Segment Reporting Information [Line Items]
Long-lived assets	829	781	659
Operating Segments [Member] | Latin America & Canada [Member]
Segment Reporting Information [Line Items]
Long-lived assets	478	779	885
Other [Member]
Segment Reporting Information [Line Items]
Other	$ 516	$ 664	$ 1,126