CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022
OPERATING ACTIVITIES
Net income	$ 3,160	$ 3,722	$ 1,287
Adjustments to reconcile to net cash provided by operating activities:
Depreciation	253	248	279
Amortization	382	360	481
Long-lived asset impairment charges	43	72	175
Deferred taxes	(603)	(20)	34
Charges (credits) associated with last-in, first-out inventory method	(157)	1	(23)
Non-cash operating lease expense	228	249	241
Gain from sales of businesses and investments	(17)	(211)	(132)
Provision for bad debts	819	45	29
European businesses held for sale	0	0	1,509
Other non-cash items	233	253	472
Changes in assets and liabilities, net of acquisitions:
Receivables	(2,954)	(1,082)	(1,843)
Inventories	(1,294)	(1,259)	(1,169)
Drafts and accounts payable	4,587	3,788	2,802
Operating lease liabilities	(339)	(338)	(356)
Taxes	331	363	243
Litigation liabilities	(395)	(1,088)	199
Other	37	56	206
Net cash provided by operating activities	4,314	5,159	4,434
INVESTING ACTIVITIES
Payments for property, plant, and equipment	(431)	(390)	(388)
Capitalized software expenditures	(256)	(168)	(147)
Acquisitions, net of cash, cash equivalents, and restricted cash acquired	(272)	(867)	(6)
Proceeds from sales of businesses and investments, net	47	1,077	578
Other	(160)	(194)	(126)
Net cash used in investing activities	(1,072)	(542)	(89)
FINANCING ACTIVITIES
Proceeds from short-term borrowings	19,964	8,450	11,192
Repayments of short-term borrowings	(19,964)	(8,450)	(11,192)
Proceeds from issuances of long-term debt	991	997	498
Repayments of long-term debt	(288)	(1,274)	(1,648)
Purchase of U.S. government obligations for the satisfaction and discharge of long-term debt	(647)	0	0
Payments for debt extinguishments	0	0	(184)
Common stock transactions:
Issuances	116	163	220
Share repurchases	(3,025)	(3,638)	(3,516)
Dividends paid	(314)	(292)	(277)
Exercise of put right by noncontrolling shareholders of McKesson Europe AG	0	0	(1,031)
Other	(175)	(324)	(383)
Net cash used in financing activities	(3,342)	(4,368)	(6,321)
Effect of exchange rate changes on cash, cash equivalents, and restricted cash	6	25	55
Cash, cash equivalents, and restricted cash classified as Assets held for sale	0	470	(540)
Net increase (decrease) in cash, cash equivalents, and restricted cash	(94)	744	(2,461)
Cash, cash equivalents, and restricted cash at beginning of year	4,679	3,935	6,396
Cash, cash equivalents, and restricted cash at end of year	4,585	4,679	3,935
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	(2)	(1)	(403)
Cash and cash equivalents at end of year	4,583	4,678	3,532
SUPPLEMENTAL CASH FLOW INFORMATION
Interest, net	234	224	186
Income taxes, net of refunds	$ 901	$ 562	$ 359