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Fair Value Measurements (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Mar. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Carrying amount of liabilities | $ 8,015,000,000 |  | $ 8,015,000,000 |  | $ 8,362,000,000
Pre-tax charges recorded during period | 236,000,000 | $ 0 | 236,000,000 | $ 0 |
Goodwill impairment charge | 350,000,000 | 290,000,000 | 350,000,000 | $ 290,000,000 |
McKesson Europe Plan |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Pre-tax charges recorded during period | 586,000,000 |  |  |  |
Goodwill impairment charge | 350,000,000 |  |  |  |
Goodwill impairment charge, after tax | 350,000,000 |  |  |  |
Technology Solutions |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Goodwill impairment charge |  |  | 0 |  |
Technology Solutions | Enterprise Information Solutions |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Goodwill impairment charge |  | 290,000,000 |  |  |
Goodwill impairment charge, after tax |  | $ 282,000,000 |  |  |
Fair malue, measurements, recurring | Fair value, inputs, level 2 |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Estimated fair values of liabilities | 8,500,000,000 |  | 8,500,000,000 |  | 8,700,000,000
Fair malue, measurements, recurring | Fair value, inputs, level 1 |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Investments in money market funds | 279,000,000 |  | $ 279,000,000 |  | 478,000,000
Fair Value, Measurements, Nonrecurring [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Liabilities measured at fair value on a nonrecurring basis |  |  |  |  | $ 0
Intangible Asset and Store Assets Impairment | McKesson Europe Plan |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Pre-tax charges recorded during period | 189,000,000 |  |  |  |
After-tax charges recorded | $ 157,000,000 |  |  |  |

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