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Goodwill Impairment Charges (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Mar. 31, 2017
Goodwill [Line Items] |  |  |  |  |
Goodwill impairment charge | $ 350 | $ 290 | $ 350 | $ 290 |
Goodwill | 11,732 |  | 11,732 |  | $ 10,586
Technology Solutions |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill impairment charge |  |  | 0 |  |
Goodwill | $ 0 |  | 0 |  | $ 454
Mckesson Europe Reporting Unit |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Discount rate used (percent) | 7.50% |  |  |  | 7.00%
Terminal growth rate used (percent) | 1.25% |  |  |  | 1.50%
Goodwill | $ 2,689 |  | $ 2,689 |  |
Enterprise Information Solutions | Technology Solutions |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill impairment charge |  | 290 |  |  |
Goodwill impairment charge, after tax |  | $ 282 |  |  |
McKesson Europe Plan |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill impairment charge | 350 |  |  |  |
Goodwill impairment charge, after tax | $ 350 |  |  |  |

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=64834752&loc=SL49117168-202975 + Details
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- Definition Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13777-109266 Reference 3: 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=66902209&loc=d3e3602-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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