Segment Reporting - Revenues by Geographic Area (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenue from External Customer [Line Items]
Sales	$ 12,551	$ 12,397	$ 35,479	$ 34,972
United States
Revenue from External Customer [Line Items]
Sales	5,625	5,573	15,396	15,320
Europe, Middle East and Africa
Revenue from External Customer [Line Items]
Sales	3,454	3,189	10,059	9,452
China
Revenue from External Customer [Line Items]
Sales	1,016	914	2,715	2,423
Japan
Revenue from External Customer [Line Items]
Sales	828	919	2,506	2,639
Asia Pacific (other than China and Japan)
Revenue from External Customer [Line Items]
Sales	735	756	2,129	2,217
Latin America
Revenue from External Customer [Line Items]
Sales	604	671	1,670	1,889
Other
Revenue from External Customer [Line Items]
Sales	$ 289	$ 375	$ 1,004	$ 1,032