Revenue - Revenue by Geographic Area (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Revenue from External Customer [Line Items]
Revenue	$ 1,534	$ 1,455
Other pharmaceuticals
Revenue from External Customer [Line Items]
Revenue	197	190
UNITED STATES
Revenue from External Customer [Line Items]
Revenue	786	718
AUSTRALIA
Revenue from External Customer [Line Items]
Revenue	43	48
BRAZIL
Revenue from External Customer [Line Items]
Revenue	63	60
CANADA
Revenue from External Customer [Line Items]
Revenue	40	41
CHINA
Revenue from External Customer [Line Items]
Revenue	66	60
FRANCE
Revenue from External Customer [Line Items]
Revenue	29	32
GERMANY
Revenue from External Customer [Line Items]
Revenue	34	37
ITALY
Revenue from External Customer [Line Items]
Revenue	21	28
JAPAN
Revenue from External Customer [Line Items]
Revenue	41	37
MEXICO
Revenue from External Customer [Line Items]
Revenue	32	28
SPAIN
Revenue from External Customer [Line Items]
Revenue	28	27
UNITED KINGDOM
Revenue from External Customer [Line Items]
Revenue	55	57
Other Developed Markets [Member]
Revenue from External Customer [Line Items]
Revenue	87	84
Other Emerging Markets [Member]
Revenue from External Customer [Line Items]
Revenue	189	179
Total geographical area
Revenue from External Customer [Line Items]
Revenue	1,514	1,436
Contract Manufacturing and Human Health Diagnostics [Member]
Revenue from External Customer [Line Items]
Revenue	$ 20	$ 19