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Restructuring and Asset Impairment Charges - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 19 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Mar. 31, 2017
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and Asset Impairment Charges | $ 236 | $ 0 | $ 236 | $ 0 |  |
Goodwill, Impairment Loss | 350 | 290 | 350 | 290 |  |
McKesson Europe Plan |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and Asset Impairment Charges | 586 |  |  |  |  |
Goodwill, Impairment Loss | 350 |  |  |  |  |
McKesson Europe Plan | Intangible Asset and Store Assets Impairment |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and Asset Impairment Charges | 189 |  |  |  |  |
After-tax charges recorded | 157 |  |  |  |  |
McKesson Europe Plan | Severance |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and Asset Impairment Charges | 47 |  |  |  |  |
After-tax charges recorded | 40 |  |  |  |  |
McKesson Europe Plan | Minimum |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Expected total pre-tax charges | 650 |  | 650 |  | $ 650 |
McKesson Europe Plan | Maximum |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Expected total pre-tax charges | 750 |  | 750 |  | 750 |
Cost Alignment Plan |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and Asset Impairment Charges |  | (10) |  | (1) |  |
Pre-tax restructuring charges incurred to-date |  |  |  |  | 250 |
Cost Alignment Plan | Other Accrued Liabilities |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring liabilities | 59 |  | 59 |  | 59 | $ 71
Cost Alignment Plan | Noncurrent Liabilities |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring liabilities | 31 |  | 31 |  | $ 31 | $ 35
Cost Alignment Plan | Severance |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Payments for severance | $ 9 | $ 26 | $ 23 | $ 71 |  |

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