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Restructuring and Asset Impairment Charges - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 28 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Pre-tax restructuring and asset impairment charges | $ 96 | $ 0 |  |  |
After-tax restructuring and asset impairment charges | 85 |  |  |  |
Pre-tax impairment charge | 20 |  |  |  |
After-tax impairment charges | 16 |  |  |  |
Payments for severance | 6 | $ 14 |  |  |
Other accrued liabilities |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring liabilities | 28 |  | $ 28 | $ 28 | $ 39
Other noncurrent liabilities |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring liabilities | 28 |  | 28 | 28 | 30
Strategic Growth Initiative Plan |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Exit-related costs | 24 |  |  |  |
Net restructuring charges recognized | 58 |  |  |  |
Restructuring liabilities | 37 |  | 37 | 37 | 0
Payments for severance | 1 |  |  |  |
Strategic Growth Initiative Plan | Severance and lease exit costs |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Net restructuring charges recognized | 58 |  |  |  |
Net restructuring charges recognized, after tax | 55 |  |  |  |
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 |
Cost Alignment Plan |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Net restructuring charges recognized |  |  |  | 256 |
Cost Alignment Plan | Minimum |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Expected total pre-tax charges | 250 |  | 250 | 250 |
Cost Alignment Plan | Maximum |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Expected total pre-tax charges | 270 |  | 270 | 270 |
Fiscal 2018 McKesson Europe Plan |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring liabilities | 28 |  | 28 | 28 | $ 42
Pre-tax charges incurred to-date |  |  | 81 |  |
Fiscal 2018 McKesson Europe Plan | Severance |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Payments for severance | 13 |  |  |  |
Fiscal 2018 McKesson Europe Plan | Severance and lease exit costs |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Net restructuring charges recognized | 7 |  |  |  |
Net restructuring charges recognized, after tax | 6 |  |  |  |
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 |
Corporate |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Net restructuring charges recognized | 11 |  |  |  |
Net restructuring charges recognized, after tax | $ 8 |  |  |  |

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