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Restructuring and Asset Impairment Charges - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 16 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2018 | Jun. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2018 | Mar. 31, 2018
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Pre-tax restructuring and asset impairment charges | $ 110 |  | $ 6 |  | $ 288 | $ 242 |  |
After-tax restructuring and asset impairment charges | 92 |  | 5 |  | 244 | 202 |  |
Pre-tax impairment charge |  | $ 20 |  |  |  |  |  |
After-tax impairment charges |  | $ 16 |  |  |  |  |  |
Impairment of long-lived and intangible assets |  |  |  |  | 671 | 539 |  |
Strategic Growth Initiative Plan |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Net restructuring charges recognized | 50 |  |  |  | 161 |  |  |
Restructuring liabilities | 80 |  |  |  | 80 |  | $ 80 | $ 0
Payments for severance |  |  |  |  | 56 |  |  |
Strategic Growth Initiative Plan | Other accrued liabilities |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring liabilities | 49 |  |  |  | 49 |  | 49 |
Strategic Growth Initiative Plan | Other noncurrent liabilities |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring liabilities | 31 |  |  |  | 31 |  | 31 |
Strategic Growth Initiative Plan | Employee severance, exit-related costs and asset impairment charges |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Net restructuring charges recognized | 19 |  |  |  | 130 |  |  |
Net restructuring charges recognized, after tax | 14 |  |  |  | 114 |  |  |
Strategic Growth Initiative Plan | Minimum |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Expected total pre-tax charges | 150 |  |  |  | 150 |  | 150 |
Strategic Growth Initiative Plan | Maximum |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Expected total pre-tax charges | 210 |  |  |  | 210 |  | 210 |
Strategic Growth Initiative Plan - Relocation of Corporate Headquarters | Severance |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Net restructuring charges recognized | 31 |  |  |  | 31 |  |  |
Net restructuring charges recognized, after tax | 23 |  |  |  | 23 |  |  |
Strategic Growth Initiative Plan - Relocation of Corporate Headquarters | Minimum | Severance |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Expected total pre-tax charges | 60 |  |  |  | 60 |  | 60 |
Strategic Growth Initiative Plan - Relocation of Corporate Headquarters | Maximum | Severance |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Expected total pre-tax charges | 120 |  |  |  | 120 |  | 120 |
Other | Severance and other restructuring-related costs |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Net restructuring charges recognized | 21 |  |  |  | 54 |  |  |
Net restructuring charges recognized, after tax | 16 |  |  |  | 40 |  |  |
Fiscal 2018 McKesson Europe Plan |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Pre-tax restructuring and asset impairment charges |  |  |  | $ 189 |  |  |  |
After-tax restructuring and asset impairment charges |  |  |  | $ 157 |  |  |  |
Restructuring liabilities | 24 |  |  |  | 24 |  | 24 | 42
Pre-tax charges incurred to-date |  |  |  |  |  |  | 89 |
Fiscal 2018 McKesson Europe Plan | Severance |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Net restructuring charges recognized |  |  | 6 |  |  | 53 |  |
Net restructuring charges recognized, after tax |  |  | 5 |  |  | 45 |  |
Payments for severance | 10 |  |  |  | 26 |  |  |
Fiscal 2018 McKesson Europe Plan | Severance and lease exit costs |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Net restructuring charges recognized | 4 |  |  |  | 15 |  |  |
Net restructuring charges recognized, after tax | 4 |  |  |  | 13 |  |  |
Fiscal 2018 McKesson Europe Plan | Minimum |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Expected total pre-tax charges | 90 |  |  |  | 90 |  | 90 |
Fiscal 2018 McKesson Europe Plan | Maximum |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Expected total pre-tax charges | 130 |  |  |  | 130 |  | 130 |
Fiscal 2016 Cost Alignment Plan |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Payments for severance | 3 |  | $ 9 |  | 14 | 32 |  |
Fiscal 2016 Cost Alignment Plan | Other accrued liabilities |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring liabilities | 22 |  |  |  | 22 |  | 22 | 39
Fiscal 2016 Cost Alignment Plan | Other noncurrent liabilities |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring liabilities | 27 |  |  |  | $ 27 |  | $ 27 | $ 30
Operating Segments | European Pharmaceutical Solutions |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Pre-tax restructuring and asset impairment charges |  |  |  |  |  | 242 |  |
After-tax restructuring and asset impairment charges |  |  |  |  |  | $ 202 |  |
Rexall Health |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
After-tax impairment charges | 35 |  |  |  |  |  |  |
Impairment of long-lived and intangible assets | $ 35 |  |  |  |  |  |  |

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