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Restructuring, Impairment, and Related Charges - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2019 | May 12, 2021
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and asset impairment charges | $ 334 | $ 268 | $ 597 |
Pre-tax charge | 219 | 156 | 352 |
Reserve balance | 151 | 157 | 237 |
International |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Long-lived asset impairment charges, before tax | 115 | 112 | 245 |
International | Retail Pharmacy |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Long-lived asset impairment charges, before tax |  | 82 | 210 |
International | Rexall Health |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Long-lived asset impairment charges, before tax |  | 30 |  |
International | U.K. |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Pre-tax charge | 57 |  |  |
Minimum | International | U.K. |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Expected total pre-tax charges | 85 |  |  |
Maximum | International | U.K. |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Expected total pre-tax charges | 90 |  |  |
Employee Severance, Exit-related Costs and Asset Impairment Charges |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Pre-tax charge |  | 15 | 135 |
Intangible Asset and Store Assets Impairment | Rexall Health | Customer relationships |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Intangible asset impairment charges, before tax |  |  | 35 |
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] |  |  |  |
Pre-tax charge | 62 | 72 | 163 |
Strategic Growth Initiative Plan - Relocation of Corporate Headquarters | Employee Retention Expenses, Asset Impairments and Accelerated Depreciation |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Pre-tax charge | $ 28 | $ 44 | 33 |
Operating Model and Cost Optimization Programs | Employee Severance, Exit-related Costs and Asset Impairment Charges |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Pre-tax charge |  |  | 18 |
Restructuring incurred to-date |  |  | $ 92 |
Subsequent Event | Minimum |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Expected total pre-tax charges |  |  |  | $ 180
Subsequent Event | Maximum |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Expected total pre-tax charges |  |  |  | $ 280

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