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Goodwill Impairment Charges (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Sep. 30, 2017 | Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2016
Goodwill [Line Items] |  |  |  |  |
Non-cash pre-tax charge |  |  | $ 1,738,000,000 | $ 290,000,000 | $ 0
Goodwill | $ 10,924,000,000 |  | 10,924,000,000 | 10,586,000,000 | 9,786,000,000
Mckesson Europe Reporting Unit |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Non-cash pre-tax charge |  |  | 1,283,000,000 |  |
Distribution Solutions |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Non-cash pre-tax charge |  |  | 1,738,000,000 | 0 |
Goodwill | 10,924,000,000 |  | 10,924,000,000 | $ 10,132,000,000 | 7,987,000,000
Distribution Solutions | Mckesson Europe Reporting Unit |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Non-cash pre-tax charge | 933,000,000 | $ 350,000,000 |  |  |
Goodwill | $ 1,851,000,000 |  | 1,851,000,000 |  |
Goodwill impairment, discount rate (percent) | 8.00% | 7.50% |  | 7.00% |
Goodwill impairment, terminal growth rate (percent) | 1.25% | 1.25% |  | 1.50% |
Distribution Solutions | Rexall Health |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Non-cash pre-tax charge | $ 455,000,000 |  | 455,000,000 |  |
Goodwill | 0 |  | $ 0 |  |
Goodwill impairment, discount rate (percent) |  |  | 10.00% |  |
Goodwill impairment, terminal growth rate (percent) |  |  | 2.00% |  |
Technology Solutions |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Non-cash pre-tax charge |  |  | $ 0 | $ 290,000,000 |
Non-cash after-tax charge |  |  |  | 282,000,000 |
Goodwill | $ 0 |  | $ 0 | $ 454,000,000 | $ 1,799,000,000

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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=77989000&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=98514028&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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