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Restructuring, Impairment and Related Charges - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Jun. 30, 2018 | Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2018 | Sep. 30, 2018
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring and asset impairment charges |  |  |  |  | $ 268 | $ 597 | $ 567 |
Long-lived asset impairment charges, before tax |  | $ 190 |  | $ 20 | 30 |  |  |
Long-lived asset impairment charges, net of tax |  | 156 |  | $ 16 | 30 |  |  |
Rexall Health |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Long-lived asset impairment charges, before tax |  |  | $ 35 |  |  |  | 488 |
Long-lived asset impairment charges, net of tax |  |  |  |  |  |  | 488 |
European Pharmaceutical Solutions |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Long-lived asset impairment charges, before tax | $ 64 |  |  |  | 82 | 210 | 446 |
Long-lived asset impairment charges, net of tax | $ 53 |  |  |  | 66 | 172 | 410 |
Intangible Asset and Store Assets Impairment | Rexall Health | Customer relationships |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Long-lived asset impairment charges, before tax |  |  |  |  | 32 | 56 |  |
Long-lived asset impairment charges, net of tax |  |  |  |  | 32 | 56 |  |
Intangible asset impairment charges, before tax |  |  |  |  |  | 35 | 33 |
Intangible asset impairment charges, net of tax |  |  |  |  |  | 35 | 33 |
Strategic Growth Initiative Plan |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Pre-tax charge |  |  |  |  | 131 | 331 |  |
Cash payments for restructuring |  |  |  |  | 136 |  |  |
Reserve balance |  | 150 |  |  | 110 | 150 |  |
Strategic Growth Initiative Plan | Employee Severance, Exit-related Costs and Asset Impairment Charges |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Pre-tax charge |  |  |  |  | 15 | 135 |  |
Restructuring charges, after tax |  |  |  |  | 12 | 122 |  |
Strategic Growth Initiative Plan - Relocation of Corporate Headquarters |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring incurred to-date |  |  |  |  | 77 |  |  |
Strategic Growth Initiative Plan - Relocation of Corporate Headquarters | Minimum |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Expected total pre-tax charges |  |  |  |  | 80 |  |  |
Strategic Growth Initiative Plan - Relocation of Corporate Headquarters | Maximum |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Expected total pre-tax charges |  |  |  |  | 130 |  |  |
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 |  |  |  |  | 44 | 33 |  |
Restructuring charges, after tax |  |  |  |  | 32 | 24 |  |
Strategic Growth Initiative Plan - Additional Global Reorganization and Business Consolidation Programs | Minimum |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Expected total pre-tax charges |  |  |  |  | 300 |  |  |
Strategic Growth Initiative Plan - Additional Global Reorganization and Business Consolidation Programs | Maximum |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Expected total pre-tax charges |  |  |  |  | 350 |  |  |
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 |  |  |  |  | 72 | 163 |  |
Restructuring charges, after tax |  |  |  |  | 55 | 127 |  |
Fiscal 2018 McKesson Europe Plan | Minimum |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Expected total pre-tax charges |  |  |  |  |  |  |  | $ 90
Fiscal 2018 McKesson Europe Plan | Maximum |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Expected total pre-tax charges |  |  |  |  |  |  |  | $ 130
Fiscal 2018 McKesson Europe Plan | Severance and Lease Exit Costs |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Pre-tax charge |  |  |  |  |  | 18 | 74 |
Restructuring charges, after tax |  |  |  |  |  | 16 | 67 |
Restructuring incurred to-date |  | 92 |  |  |  | 92 |  |
Reserve balance |  | 19 |  |  | 4 | 19 |  |
Fiscal 2018 McKesson Europe Plan | Employee Severance |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Cash payments for restructuring |  |  |  |  |  | 32 | $ 10 |
Other Restructuring Plans |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Reserve balance |  | $ 68 |  |  | $ 43 | $ 68 |  |

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