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Segment and Geographic Area Information - Geographic Information (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Information
Net Sales to External Customers	$ 8,314	$ 8,076	$ 7,979	$ 7,535	$ 7,765	$ 7,656	$ 7,767	$ 7,390	$ 31,904	$ 30,578	$ 27,390
Long-lived assets	10,200				8,700				10,200	8,700
U.S.
Segment Information
Net Sales to External Customers									11,398	10,839	9,673
Long-lived assets	$ 5,100				$ 4,300				5,100	4,300
China
Segment Information
Net Sales to External Customers									2,346	2,311	2,146
Germany
Segment Information
Net Sales to External Customers									1,751	1,619	1,366
Japan
Segment Information
Net Sales to External Customers									1,435	1,326	1,255
India
Segment Information
Net Sales to External Customers									1,397	1,333	1,237
Switzerland
Segment Information
Net Sales to External Customers									1,068	1,005	841
The Netherlands
Segment Information
Net Sales to External Customers									975	930	929
All Other Countries
Segment Information
Net Sales to External Customers									$ 11,534	$ 11,215	$ 9,943