Segment Reporting (Other Expenses By Segment) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Segment Reporting Information [Line Items]
Depreciation expense	$ 669	$ 672	$ 796
Capital expenditures	1,172	960	1,153
Operating Segments [Member]
Segment Reporting Information [Line Items]
Depreciation expense	660	662	786
Capital expenditures	1,171	959	1,150
Operating Segments [Member] | European Union [Member]
Segment Reporting Information [Line Items]
Depreciation expense	247	230	206
Capital expenditures	665	497	537
Operating Segments [Member] | Eastern Europe, Middle East & Africa [Member]
Segment Reporting Information [Line Items]
Depreciation expense	150	163	212
Capital expenditures	223	147	216
Operating Segments [Member] | Asia [Member]
Segment Reporting Information [Line Items]
Depreciation expense	184	184	278
Capital expenditures	180	185	272
Operating Segments [Member] | Latin America & Canada [Member]
Segment Reporting Information [Line Items]
Depreciation expense	79	85	90
Capital expenditures	103	130	125
Other [Member]
Segment Reporting Information [Line Items]
Depreciation expense	9	10	10
Capital expenditures	$ 1	$ 1	$ 3