Asset Impairment and Exit Costs - Asset Impairment and Exit Costs by Segment (Details) $ in Millions	1 Months Ended	3 Months Ended		6 Months Ended
	Jun. 30, 2020 employee	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)
Restructuring Cost and Reserve [Line Items]
Expected number of positions eliminated | employee	240
Total separation programs		$ 64	$ 15	$ 64	$ 18
Asset impairment charges		7	8	7	25
Asset impairment and exit costs		71	23	71	43
European Union [Member] | Operating Segments [Member]
Restructuring Cost and Reserve [Line Items]
Total separation programs		24	0	24	0
Asset impairment charges		3	0	3	0
Eastern Europe [Member] | Operating Segments [Member]
Restructuring Cost and Reserve [Line Items]
Total separation programs		6	0	6	0
Asset impairment charges		1	0	1	0
Middle East & Africa [Member] | Operating Segments [Member]
Restructuring Cost and Reserve [Line Items]
Total separation programs		8	0	8	0
Asset impairment charges		1	0	1	0
South & Southeast Asia [Member] | Operating Segments [Member]
Restructuring Cost and Reserve [Line Items]
Total separation programs		10	0	10	3
Asset impairment charges		1	0	1	17
East Asia & Australia [Member] | Operating Segments [Member]
Restructuring Cost and Reserve [Line Items]
Total separation programs		12	0	12	0
Asset impairment charges		1	0	1	0
Latin America & Canada [Member] | Operating Segments [Member]
Restructuring Cost and Reserve [Line Items]
Total separation programs		4	15	4	15
Asset impairment charges		$ 0	$ 8	$ 0	$ 8