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Restructuring, Impairment, and Related Charges - Summary of Details for Charges Recorded (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2019
Restructuring Cost and Reserve [Line Items] |  |  |
Severance and employee-related costs, net | $ 104 | $ 47 | $ 154
Exit-related costs | 59 | 79 | 164
Asset impairments and accelerated depreciation | 56 | 30 | 34
Total | 219 | 156 | 352
Operating Segments | U.S. Pharmaceutical |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Severance and employee-related costs, net | 10 | 12 | 46
Exit-related costs | 11 | 1 | 9
Asset impairments and accelerated depreciation | 0 | 10 | 6
Total | 21 | 23 | 61
Operating Segments | International |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Severance and employee-related costs, net | 22 | 2 | 51
Exit-related costs | 17 | 13 | 83
Asset impairments and accelerated depreciation | 46 | 6 | 24
Total | 85 | 21 | 158
Operating Segments | Medical-Surgical Solutions |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Severance and employee-related costs, net | (1) | 4 | 18
Exit-related costs | 4 | 19 | 20
Asset impairments and accelerated depreciation | 1 | 1 | 3
Total | 4 | 24 | 41
Operating Segments | Prescription Technology Solutions |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Severance and employee-related costs, net | 4 | (1) | 3
Exit-related costs | 0 | 0 | 0
Asset impairments and accelerated depreciation | 0 | 0 | 0
Total | 4 | (1) | 3
Corporate |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Severance and employee-related costs, net | 69 | 30 | 36
Exit-related costs | 27 | 46 | 52
Asset impairments and accelerated depreciation | 9 | 13 | 1
Total | $ 105 | $ 89 | $ 89

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