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Restructuring and Asset Impairment Charges - Summary of Activity Related to Restructuring Liability (Details) $ in Millions	12 Months Ended
	Mar. 31, 2019 USD ($)
Other
Cost Alignment Plan
Restructuring charges recognized	$ 91
Strategic Growth Initiative Plan
Cost Alignment Plan
Beginning balance	0
Restructuring charges recognized	331
Non-cash charges	(33)
Cash payments	(141)
Other	(7)
Ending balance	150
Strategic Growth Initiative Plan | Operating Segments | U.S. Pharmaceutical and Specialty Solutions
Cost Alignment Plan
Beginning balance	0
Restructuring charges recognized	63
Non-cash charges	(6)
Cash payments	(8)
Other	(18)
Ending balance	31
Strategic Growth Initiative Plan | Operating Segments | European Pharmaceutical Solutions
Cost Alignment Plan
Beginning balance	0
Restructuring charges recognized	41
Non-cash charges	(5)
Cash payments	(5)
Other	7
Ending balance	38
Strategic Growth Initiative Plan | Operating Segments | Medical-Surgical Solutions
Cost Alignment Plan
Beginning balance	0
Restructuring charges recognized	42
Non-cash charges	(3)
Cash payments	(23)
Other	(1)
Ending balance	15
Strategic Growth Initiative Plan | Operating Segments | Other
Cost Alignment Plan
Beginning balance	0
Restructuring charges recognized	91
Non-cash charges	(18)
Cash payments	(52)
Other	8
Ending balance	29
Strategic Growth Initiative Plan | Corporate
Cost Alignment Plan
Beginning balance	0
Restructuring charges recognized	94
Non-cash charges	(1)
Cash payments	(53)
Other	(3)
Ending balance	37
Other Accrued Liabilities | Strategic Growth Initiative Plan
Cost Alignment Plan
Ending balance	117
Other Noncurrent Liabilities | Strategic Growth Initiative Plan
Cost Alignment Plan
Ending balance	$ 33

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