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Restructuring, Impairment, and Related Charges - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Mar. 31, 2020
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring, impairment, and related charges, net | $ 245 | $ 219 | $ 156
Employee Severance, Exit-related Costs and Asset Impairment Charges |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring, impairment, and related charges, net |  |  | 15
International |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Long-lived asset impairment charges, before tax | 36 | 115 | 112
International | Retail Pharmacy Reporting Unit [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Long-lived asset impairment charges, before tax |  |  | 82
International | Rexall Health |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Long-lived asset impairment charges, before tax |  |  | 30
U.K. | International |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring, impairment, and related charges, net |  | 57 |
Restructuring Plan, Remote Work Transitioning |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring, impairment, and related charges, net | $ 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, impairment, and related charges, net |  | 62 | 72
Strategic Growth Initiative Plan - Relocation of Corporate Headquarters | Employee Retention Expenses, Asset Impairments and Accelerated Depreciation |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring, impairment, and related charges, net |  | $ 28 | $ 44

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