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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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