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Redeemable Noncontrolling Interests and Noncontrolling Interests - Narrative (Details) $ / shares in Units, shares in Millions		3 Months Ended		6 Months Ended
	Sep. 19, 2018 € / shares $ / shares	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2018 € / shares	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($) shares	Sep. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Mar. 31, 2017 USD ($)	Dec. 02, 2014 € / shares
Noncontrolling Interest [Line Items]
Put right redemption price per share (in euros per share) | € / shares				€ 22.99
Put right value, interest rate spread (as a percent)							5.00%
Carrying value of redeemable noncontrolling interests							$ 1,415,000,000	$ 1,459,000,000
Noncontrolling Interests							208,000,000	253,000,000
Net income attributable to noncontrolling interests		$ 54,000,000	$ 55,000,000		$ 112,000,000	$ 111,000,000
Net income attributable to McKesson and transfers from noncontrolling interests						313,000,000
Mckesson Europe Subsidiary
Noncontrolling Interest [Line Items]
Dividend (in usd per share) | € / shares				€ 0.83
Redeemable Noncontrolling Interest
Noncontrolling Interest [Line Items]
Net income attributable to noncontrolling interests					23,000,000	20,000,000
Decrease in redeemable noncontrolling interests					0	53,000,000
Carrying value of redeemable noncontrolling interests			1,423,000,000			1,423,000,000	1,415,000,000	1,459,000,000	$ 1,327,000,000
Additional Paid-in Capital
Noncontrolling Interest [Line Items]
Effect of changes in ownership interests with noncontrollling interests						3,000,000
Mckesson Europe Subsidiary
Noncontrolling Interest [Line Items]
One-time guaranteed dividend (in usd per share) | € / shares										€ 0.83
Net income attributable to noncontrolling interests		11,000,000	11,000,000		23,000,000	20,000,000
Put right redemption price per share (in euros per share) | € / shares	€ 23.50
Payments to acquire shares of Celesio						$ 50,000,000
Number of redeemable noncontrolling interest shares repurchased (shares) | shares						1.9
Carrying value of redeemable noncontrolling interests							1,420,000,000	1,460,000,000
Maximum redemption value of redeemable noncontrolling interest							$ 1,270,000,000.00	$ 1,350,000,000.00
Ownership percentage (as a percent)							77.00%	77.00%
Increase in Put Amount (in euros per share) | $ / shares	€ 0.51
Mckesson Europe Subsidiary | Redeemable Noncontrolling Interest
Noncontrolling Interest [Line Items]
Decrease in redeemable noncontrolling interests						$ 53,000,000
Vantage and ClarusOne Sourcing Services LLC
Noncontrolling Interest [Line Items]
Noncontrolling Interests							$ 208,000,000	$ 253,000,000
Net income attributable to noncontrolling interests		$ 43,000,000	$ 44,000,000		$ 89,000,000	$ 91,000,000

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