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Goodwill Impairment Charges (Details)	3 Months Ended				9 Months Ended
	Dec. 31, 2018 USD ($)	Jun. 30, 2018 USD ($) reporting_unit	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Dec. 31, 2018 USD ($) reporting_unit	Dec. 31, 2017 USD ($)	Mar. 31, 2018 USD ($)
Goodwill [Line Items]
Pretax goodwill impairment charges	$ 21,000,000		$ 0		$ 591,000,000	$ 350,000,000
Goodwill	10,519,000,000				10,519,000,000		$ 10,924,000,000
Consumer Solutions Reporting Unit
Goodwill [Line Items]
After-tax goodwill impairment		$ 332,000,000
Pharmacy Solutions Reporting Unit
Goodwill [Line Items]
After-tax goodwill impairment		238,000,000
European Pharmaceutical Solutions
Goodwill [Line Items]
Pretax goodwill impairment charges		570,000,000			$ 570,000,000
After-tax goodwill impairment		$ 570,000,000
Number of reporting units | reporting_unit		2			2
Goodwill	1,193,000,000				$ 1,193,000,000		1,850,000,000
European Pharmaceutical Solutions | Consumer Solutions Reporting Unit
Goodwill [Line Items]
Pretax goodwill impairment charges		$ 332,000,000
Discount rate (percent)		8.50%
Terminal growth rate (percent)		1.25%
Goodwill	461,000,000				461,000,000
European Pharmaceutical Solutions | Pharmacy Solutions Reporting Unit
Goodwill [Line Items]
Pretax goodwill impairment charges		$ 238,000,000
Discount rate (percent)		8.00%
Terminal growth rate (percent)		1.25%
Goodwill	732,000,000				732,000,000
Distribution Solutions Segment
Goodwill [Line Items]
Pretax goodwill impairment charges				$ 350,000,000
After-tax goodwill impairment				350,000,000
Other
Goodwill [Line Items]
Pretax goodwill impairment charges					21,000,000
Goodwill	2,806,000,000				$ 2,806,000,000		$ 2,894,000,000
Other | Rexall Health
Goodwill [Line Items]
Pretax goodwill impairment charges	21,000,000
After-tax goodwill impairment	$ 21,000,000
Mckesson Europe Reporting Unit
Goodwill [Line Items]
Goodwill impairment, tax benefit				$ 0

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