CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2021
OPERATING ACTIVITIES
Net income (loss)	$ 3,722	$ 1,287	$ (4,340)
Adjustments to reconcile to net cash provided by operating activities:
Depreciation	248	279	321
Amortization	360	481	566
Goodwill and long-lived asset impairment charges	72	175	242
Deferred taxes	(20)	34	(908)
Charges (credits) associated with last-in, first-out inventory method	1	(23)	(38)
Non-cash operating lease expense	249	241	334
Gain from sales of businesses and investments	(211)	(132)	(9)
European businesses held for sale	0	1,509	0
Other non-cash items	298	501	188
Changes in assets and liabilities, net of acquisitions:
Receivables	(1,082)	(1,843)	1,145
Inventories	(1,259)	(1,169)	(2,276)
Drafts and accounts payable	3,788	2,802	1,267
Operating lease liabilities	(338)	(356)	(362)
Taxes	363	243	(166)
Litigation liabilities	(1,088)	199	8,067
Other	56	206	511
Net cash provided by operating activities	5,159	4,434	4,542
INVESTING ACTIVITIES
Payments for property, plant, and equipment	(390)	(388)	(451)
Capitalized software expenditures	(168)	(147)	(190)
Acquisitions, net of cash, cash equivalents, and restricted cash acquired	(867)	(6)	(35)
Proceeds from sales of businesses and investments, net	1,077	578	400
Other	(194)	(126)	(139)
Net cash used in investing activities	(542)	(89)	(415)
FINANCING ACTIVITIES
Proceeds from short-term borrowings	8,450	11,192	6,323
Repayments of short-term borrowings	(8,450)	(11,192)	(6,323)
Proceeds from issuances of long-term debt	997	498	500
Repayments of long-term debt	(1,274)	(1,648)	(1,040)
Payments for debt extinguishments	0	(184)	0
Common stock transactions:
Issuances	163	220	92
Share repurchases	(3,638)	(3,516)	(742)
Dividends paid	(292)	(277)	(276)
Exercise of put right by noncontrolling shareholders of McKesson Europe AG	0	(1,031)	(49)
Other	(324)	(383)	(178)
Net cash used in financing activities	(4,368)	(6,321)	(1,693)
Effect of exchange rate changes on cash, cash equivalents, and restricted cash	25	55	(61)
Cash, cash equivalents, and restricted cash classified within Assets held for sale	470	(540)	0
Net increase (decrease) in cash, cash equivalents, and restricted cash	744	(2,461)	2,373
Cash, cash equivalents, and restricted cash at beginning of year	3,935	6,396	4,023
Cash, cash equivalents, and restricted cash at end of year	4,679	3,935	6,396
Less: Restricted cash at end of period included in Other Noncurrent Assets
Less: Restricted cash at end of year included in Prepaid expenses and other	(1)	(403)	(118)
Cash and cash equivalents at end of year	4,678	3,532	6,278
SUPPLEMENTAL CASH FLOW INFORMATION
Interest, net	224	186	220
Income taxes, net of refunds	$ 562	$ 359	$ 379