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Segments of Business - Narrative (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 segment | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Sep. 30, 2015 USD ($) | Jun. 30, 2015 USD ($) | Mar. 31, 2018 USD ($) segment | Mar. 31, 2017 USD ($) | Mar. 31, 2016 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of operating segments | segment |  |  |  |  |  |  |  |  |  |  |  | 2 |  |
Goodwill impairment charge |  |  |  |  |  |  |  |  |  |  |  | $ 1,738 | $ 290 | $ 0
Pre-tax charge |  |  |  |  |  |  |  |  |  |  |  | 13 | 14 | 229
Charges (credits) associated with last-in-first-out inventory method |  |  |  |  |  |  |  |  |  |  |  | (99) | (7) | 244
Corporate |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pre-tax charge |  |  |  |  |  |  |  |  |  |  |  | 0 | 5 | $ 17
Distribution Solutions |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill impairment charge |  |  |  |  |  |  |  |  |  |  |  | $ 1,738 | $ 0 |
Distribution Solutions | Operating Segments |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of total revenue (less than) (as a percent) |  |  |  |  |  |  |  |  |  |  |  | 2.00% | 2.00% | 2.00%
Pre-tax charge |  |  |  |  |  |  |  |  |  |  |  | $ 13 | $ 19 | $ 161
Net cash proceeds |  |  |  |  |  |  | $ 2 |  | $ 142 |  |  |  | 144 | 76
Charges (credits) associated with last-in-first-out inventory method |  | $ (94) | $ (2) | $ (29) | $ 26 | $ 144 | $ (155) | $ (43) | $ 47 |  |  |  |  |
Distribution Solutions | Operating Segments | ZEE Medical Business |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pre-tax gain on sale of business |  |  |  |  |  |  |  |  |  | $ 52 |  |  |  | 52
Technology Solutions |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill impairment charge |  |  |  |  |  |  |  |  |  |  |  | 0 | 290 |
Technology Solutions | Operating Segments |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill impairment charge |  |  |  |  |  |  |  | $ 290 |  |  |  |  |  |
Pre-tax charge |  |  |  |  |  |  |  |  |  |  |  | 0 | (10) | 51
Technology Solutions | Operating Segments | Core MTS Businesses |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pre-tax gain on sale of business |  |  |  |  |  | $ 3,947 |  |  |  |  |  |  | 3,947 |
Technology Solutions | Operating Segments | Nurse Triage |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pre-tax gain on sale of business |  |  |  |  |  |  |  |  |  |  | $ 51 |  |  | 51
Cost Alignment Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pre-tax charge |  |  |  |  |  |  |  |  |  |  |  | 13 | $ 14 | $ 229
Disposal Group, Held-for-sale, Not Discontinued Operations | Enterprise Information Solutions |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pre-tax gain on sale of business |  |  | $ 109 |  |  |  |  |  |  |  |  |  |  |
Mckesson Europe Reporting Unit |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill impairment charge |  |  |  |  |  |  |  |  |  |  |  | 1,283 |  |
Mckesson Europe Reporting Unit | Distribution Solutions |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill impairment charge |  | 933 |  | 350 |  |  |  |  |  |  |  |  |  |
Rexall Health | Distribution Solutions |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill impairment charge |  | 455 |  |  |  |  |  |  |  |  |  | 455 |  |
Intangible Asset and Store Assets Impairment |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pre-tax charge |  |  |  |  |  |  |  |  |  |  |  | 479 |  |
Intangible Asset and Store Assets Impairment | Fiscal 2018 McKesson Europe Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pre-tax charge |  | $ 257 |  | $ 189 |  |  |  |  |  |  |  | 446 |  |
Severance and Lease Exit Costs | Fiscal 2018 McKesson Europe Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pre-tax charge |  |  |  |  |  |  |  |  |  |  |  | $ 74 |  |
Expected |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of operating segments | segment | 3 |  |  |  |  |  |  |  |  |  |  |  |  |

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