Revenue from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Disaggregation of Revenue [Line Items]
Net sales	$ 1,148	$ 1,102
North America
Disaggregation of Revenue [Line Items]
Net sales	696	635
Europe
Disaggregation of Revenue [Line Items]
Net sales	340	355
APAC & Emerging Markets
Disaggregation of Revenue [Line Items]
Net sales	112	112
Operating Segments | North America
Disaggregation of Revenue [Line Items]
Net sales	696	635
Operating Segments | Europe
Disaggregation of Revenue [Line Items]
Net sales	344	361
Operating Segments | APAC & Emerging Markets
Disaggregation of Revenue [Line Items]
Net sales	112	112
Operating Segments | Supply Chain Services
Disaggregation of Revenue [Line Items]
Net sales	983	964
Operating Segments | Supply Chain Services | North America
Disaggregation of Revenue [Line Items]
Net sales	537	503
Operating Segments | Supply Chain Services | Europe
Disaggregation of Revenue [Line Items]
Net sales	337	352
Operating Segments | Supply Chain Services | APAC & Emerging Markets
Disaggregation of Revenue [Line Items]
Net sales	109	109
Operating Segments | Prescription Management
Disaggregation of Revenue [Line Items]
Net sales	140	112
Operating Segments | Prescription Management | North America
Disaggregation of Revenue [Line Items]
Net sales	140	112
Operating Segments | Prescription Management | Europe
Disaggregation of Revenue [Line Items]
Net sales	0	0
Operating Segments | Prescription Management | APAC & Emerging Markets
Disaggregation of Revenue [Line Items]
Net sales	0	0
Operating Segments | Software Services
Disaggregation of Revenue [Line Items]
Net sales	25	26
Operating Segments | Software Services | North America
Disaggregation of Revenue [Line Items]
Net sales	19	20
Operating Segments | Software Services | Europe
Disaggregation of Revenue [Line Items]
Net sales	3	3
Operating Segments | Software Services | APAC & Emerging Markets
Disaggregation of Revenue [Line Items]
Net sales	$ 3	$ 3