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Restructuring and Asset Impairment Charges - Summary of Restructuring Activity (Details) - Strategic Growth Initiative Plan - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Dec. 31, 2018	Dec. 31, 2018
Restructuring Reserve [Roll Forward]
Balance March 31, 2018		$ 0
Net restructuring charges recognized	$ 50	161
Non-cash charges		(25)
Cash Payments		(56)
Balance, December 31, 2018	80	80
Corporate
Restructuring Reserve [Roll Forward]
Balance March 31, 2018		0
Net restructuring charges recognized	31	31
Non-cash charges		0
Cash Payments		0
Balance, December 31, 2018	31	31
Operating Segments | U.S. Pharmaceutical and Specialty Solutions
Restructuring Reserve [Roll Forward]
Balance March 31, 2018		0
Net restructuring charges recognized	4	17
Non-cash charges		(6)
Cash Payments		(7)
Balance, December 31, 2018	4	4
Operating Segments | Medical-Surgical Solutions
Restructuring Reserve [Roll Forward]
Balance March 31, 2018		0
Net restructuring charges recognized	6	24
Non-cash charges		(2)
Cash Payments		(13)
Balance, December 31, 2018	9	9
Operating Segments | Other
Restructuring Reserve [Roll Forward]
Balance March 31, 2018		0
Net restructuring charges recognized	9	89
Non-cash charges		(17)
Cash Payments		(36)
Balance, December 31, 2018	$ 36	$ 36

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