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Restructuring, Impairment, and Related Charges, Net - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2023 | Mar. 31, 2022 | Mar. 31, 2021
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring, impairment, and related charges, net | $ 209 | $ 281 | $ 334
Restructuring charges | 209 | 245 | 219
Long-lived asset impairment charges, before tax | 0 |  |
International |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Long-lived asset impairment charges, before tax |  | 36 |
International | Retail Pharmacy Reporting Unit |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Long-lived asset impairment charges, before tax |  |  | 115
U.K. | International |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring charges |  | 0 | 57
Strategic Growth Initiative Plan - Operational Efficiencies and Cost Optimization |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring costs, anticipated total charges | 125 |  |
Restructuring charges | $ 60 |  |
Restructuring Plan, Remote Work Transitioning |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring charges |  | $ 124 |
Strategic Growth Initiative Plan - Additional Global Reorganization and Business Consolidation Programs | Employee Severance, Accelerated Depreciation and Project Consulting Fees |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring charges |  |  | 62
Strategic Growth Initiative Plan - Relocation of Corporate Headquarters | Employee Retention Expenses, Asset Impairments and Accelerated Depreciation |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring charges |  |  | $ 28

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