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Redeemable Noncontrolling Interests and Noncontrolling Interests - Narrative (Details) shares in Millions	3 Months Ended
	Jun. 30, 2021 USD ($) shares	Jun. 30, 2020 USD ($) shares	Apr. 12, 2021 € / shares	Mar. 31, 2021 USD ($)	Mar. 31, 2020 USD ($)	Sep. 19, 2018 € / shares	Dec. 31, 2014 € / shares
Noncontrolling Interest [Line Items]
Put right redemption price per share (in euros per share) | € / shares			€ 22.99			€ 23.50	€ 22.99
Put right value, interest rate spread (as a percent)	5.00%
Increase in Put Amount (in Euros per share) | € / shares						€ 0.51
Payments for purchase shares of McKesson Europe	$ 1,031,000,000	$ 49,000,000
Associated increase in Company's ownership interest on its equity	8,000,000	3,000,000
Carrying value of redeemable noncontrolling interests	7,000,000			$ 1,271,000,000
Net income attributable to noncontrolling interests	47,000,000	50,000,000
Redeemable Noncontrolling Interests
Noncontrolling Interest [Line Items]
Net income attributable to noncontrolling interests	8,000,000	11,000,000
Decrease in noncontrolling interest	983,000,000	49,000,000
Carrying value of redeemable noncontrolling interests	7,000,000	1,414,000,000		1,271,000,000	$ 1,402,000,000
Additional Paid-in Capital
Noncontrolling Interest [Line Items]
Associated increase in Company's ownership interest on its equity	178,000,000	3,000,000
McKesson Europe Subsidiary
Noncontrolling Interest [Line Items]
Annual recurring dividend (in euro per share) | € / shares			€ 0.83				€ 0.83
McKesson Europe Subsidiary
Noncontrolling Interest [Line Items]
Net income attributable to noncontrolling interests	8,000,000	11,000,000
Payments for purchase shares of McKesson Europe	$ 1,000,000,000.0	$ 49,000,000
Shares purchased (shares) | shares	34.5	1.8
Carrying value of redeemable noncontrolling interests				1,300,000,000
Maximum redemption value of redeemable noncontrolling interest				$ 1,200,000,000
Ownership percentage (as a percent)	95.00%			78.00%
Vantage and ClarusOne Sourcing Services LLC
Noncontrolling Interest [Line Items]
Net income attributable to noncontrolling interests	$ 39,000,000	$ 39,000,000

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