Revenue - Revenue by Geographic Area (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenue from External Customer [Line Items]
Revenue	$ 1,548	$ 1,547	$ 3,082	$ 3,002
Other pharmaceuticals
Revenue from External Customer [Line Items]
Revenue	192	187	389	377
UNITED STATES
Revenue from External Customer [Line Items]
Revenue	823	780	1,609	1,498
AUSTRALIA
Revenue from External Customer [Line Items]
Revenue	51	49	94	97
BRAZIL
Revenue from External Customer [Line Items]
Revenue	56	74	119	134
CANADA
Revenue from External Customer [Line Items]
Revenue	54	54	94	95
CHINA
Revenue from External Customer [Line Items]
Revenue	66	56	132	116
FRANCE
Revenue from External Customer [Line Items]
Revenue	24	27	53	59
GERMANY
Revenue from External Customer [Line Items]
Revenue	40	39	74	76
ITALY
Revenue from External Customer [Line Items]
Revenue	14	28	35	56
JAPAN
Revenue from External Customer [Line Items]
Revenue	53	41	94	78
MEXICO
Revenue from External Customer [Line Items]
Revenue	26	30	58	58
SPAIN
Revenue from External Customer [Line Items]
Revenue	24	30	52	57
UNITED KINGDOM
Revenue from External Customer [Line Items]
Revenue	26	42	81	99
Other Developed Markets [Member]
Revenue from External Customer [Line Items]
Revenue	90	88	177	172
Other Emerging Markets [Member]
Revenue from External Customer [Line Items]
Revenue	159	162	325	321
Total geographical area
Revenue from External Customer [Line Items]
Revenue	1,531	1,522	3,045	2,958
Contract Manufacturing and Human Health Diagnostics [Member]
Revenue from External Customer [Line Items]
Revenue	17	25	37	44
CHILE
Revenue from External Customer [Line Items]
Revenue	$ 25	$ 22	$ 48	$ 42