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Restructuring and Asset Impairment Charges - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2018 | Jun. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Mar. 31, 2018
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Pre-tax restructuring and asset impairment charges | $ 82 |  | $ 236 | $ 178 | $ 236 |  |
After-tax restructuring and asset impairment charges | 67 |  | 197 | 152 |  |  |
Pre-tax impairment charge |  | $ 20 |  |  |  |  |
After-tax impairment charges |  | $ 16 |  |  |  |  |
Strategic Growth Initiative Plan |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Exit-related costs | 45 |  |  | 69 |  |  |
Net restructuring charges recognized | 53 |  |  | 111 |  |  |
Restructuring liabilities | 58 |  |  | 58 |  | $ 58 | $ 0
Payments for severance |  |  |  | 31 |  |  |
Strategic Growth Initiative Plan | Severance and lease exit costs |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Net restructuring charges recognized | 53 |  |  | 111 |  |  |
Net restructuring charges recognized, after tax | 45 |  |  | 100 |  |  |
Strategic Growth Initiative Plan | Severance and other restructuring-related costs |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Net restructuring charges recognized | 22 |  |  | 33 |  |  |
Net restructuring charges recognized, after tax | 16 |  |  | 24 |  |  |
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 |
Fiscal 2018 McKesson Europe Plan |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring liabilities | 31 |  |  | 31 |  | 31 | 42
Pre-tax charges incurred to-date |  |  |  |  |  | 85 |
Fiscal 2018 McKesson Europe Plan | Severance |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Payments for severance | 3 |  |  | 16 |  |  |
Fiscal 2018 McKesson Europe Plan | Severance and lease exit costs |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Net restructuring charges recognized | 4 |  | 47 | 11 | 47 |  |
Net restructuring charges recognized, after tax | 3 |  | 40 | 9 | 40 |  |
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 | 5 |  | $ 9 | 11 | 23 |  |
Fiscal 2016 Cost Alignment Plan | Other accrued liabilities |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring liabilities | 27 |  |  | 27 |  | 27 | 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 |  |  |  |  | 236 |  |
After-tax goodwill impairment |  |  |  | $ 570 |  |  |
After-tax restructuring and asset impairment charges |  |  |  |  | $ 197 |  |

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- Definition Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Includes, but is not limited to, one-time termination benefits, termination of an operating lease or other contract, consolidating or closing facilities, and relocating employees, and termination benefits associated with an ongoing benefit arrangement. Excludes expenses associated with special or contractual termination benefits, a discontinued operation or an asset retirement obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 5.P.3) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140864-122747 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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