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Restructuring and Asset Impairment Charges - Summary of Restructuring Charges (Details) - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Fiscal 2019 Initiatives
Restructuring Cost and Reserve [Line Items]
Severance and employee-related costs, net	$ 4	$ 14
Exit-related costs	14	35
Asset impairments and accelerated depreciation and amortization	5	20
Net restructuring charges recognized	23	69
Strategic Growth Initiative Plan
Restructuring Cost and Reserve [Line Items]
Net restructuring charges recognized	4
Operating Segments | U.S. Pharmaceutical and Specialty Solutions | Fiscal 2019 Initiatives
Restructuring Cost and Reserve [Line Items]
Severance and employee-related costs, net	(1)	3
Exit-related costs	0	1
Asset impairments and accelerated depreciation and amortization	0	4
Net restructuring charges recognized	(1)	8
Operating Segments | European Pharmaceutical Solutions | Fiscal 2019 Initiatives
Restructuring Cost and Reserve [Line Items]
Severance and employee-related costs, net	(1)
Exit-related costs	1
Asset impairments and accelerated depreciation and amortization	3
Net restructuring charges recognized	3
Operating Segments | Medical-Surgical Solutions | Fiscal 2019 Initiatives
Restructuring Cost and Reserve [Line Items]
Severance and employee-related costs, net	0	10
Exit-related costs	2	2
Asset impairments and accelerated depreciation and amortization	1	0
Net restructuring charges recognized	3	12
Operating Segments | Other | Fiscal 2019 Initiatives
Restructuring Cost and Reserve [Line Items]
Severance and employee-related costs, net	0	1
Exit-related costs	1	21
Asset impairments and accelerated depreciation and amortization	0	16
Net restructuring charges recognized	1	38
Corporate | Fiscal 2019 Initiatives
Restructuring Cost and Reserve [Line Items]
Severance and employee-related costs, net	6	0
Exit-related costs	10	11
Asset impairments and accelerated depreciation and amortization	1	0
Net restructuring charges recognized	$ 17	$ 11

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