Segment Information (Net Sales and Long-Lived Assets by Country) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 5,660	$ 5,326	$ 5,140	$ 4,911	$ 5,702	$ 5,418	$ 5,347	$ 4,786	$ 21,037	$ 21,253	$ 20,718
Long-lived assets	8,161				9,742				$ 8,161	$ 9,742	$ 9,318
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales, percent									12.00%	10.00%	9.00%
Net sales									$ 10,642	$ 10,378	$ 9,901
Long-lived assets	4,556				4,577				4,556	4,577	4,587
China
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									851	824	945
Long-lived assets	907				1,066				907	1,066	981
All Other Countries
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									9,544	10,051	9,872
Long-lived assets	$ 2,698				$ 4,099				$ 2,698	$ 4,099	$ 3,750