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Redeemable Noncontrolling Interests and Noncontrolling Interests - Narrative (Details) shares in Millions	3 Months Ended			9 Months Ended
	Dec. 31, 2021 USD ($)	Jun. 30, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2021 USD ($) shares	Dec. 31, 2020 USD ($) shares	Sep. 30, 2021 USD ($)	Apr. 12, 2021 € / shares	Mar. 31, 2021 USD ($)	Sep. 30, 2020 USD ($)	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
Reclassification of McKesson Europe redeemable noncontrolling interests				(287,000,000)
Carrying value of redeemable noncontrolling interests	$ 0			0				$ 1,271,000,000
Net income attributable to noncontrolling interests	46,000,000		$ 52,000,000	136,000,000	152,000,000
Redeemable Noncontrolling Interests
Noncontrolling Interest [Line Items]
Net income attributable to noncontrolling interests	0		11,000,000	8,000,000	32,000,000
Decrease in noncontrolling interest				983,000,000	49,000,000
Reclassification of McKesson Europe redeemable noncontrolling interests				287,000,000
Carrying value of redeemable noncontrolling interests	0		1,292,000,000	0	1,292,000,000	$ 0		1,271,000,000	$ 1,265,000,000	$ 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
Noncontrolling Interests
Noncontrolling Interest [Line Items]
Reclassification of McKesson Europe redeemable noncontrolling interests				(287,000,000)
Net income attributable to noncontrolling interests	$ 46,000,000		41,000,000	128,000,000	120,000,000
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		32,000,000
Payments for purchase shares of McKesson Europe				$ 1,000,000,000	$ 49,000,000
Shares purchased (in 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%			95.00%				78.00%
Vantage and ClarusOne Sourcing Services LLC
Noncontrolling Interest [Line Items]
Net income attributable to noncontrolling interests	$ 46,000,000		$ 41,000,000	$ 128,000,000	$ 120,000,000

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