CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	6 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
OPERATING ACTIVITIES
Net income	$ 843	$ 1,121
Adjustments to reconcile to net cash provided by (used in) operating activities:
Depreciation	148	154
Amortization	265	285
Goodwill and long-lived asset impairment charges	127	104
Deferred taxes	(18)	(35)
Credits associated with last-in, first-out inventory method	(46)	(104)
Non-cash operating lease expense	152	172
Loss (gain) from sales of businesses and investments	(101)	1
European businesses held for sale	470	0
Other non-cash items	381	17
Changes in assets and liabilities, net of acquisitions:
Receivables	(2,311)	981
Inventories	(1,164)	(1,396)
Drafts and accounts payable	1,431	(1,305)
Operating lease liabilities	(186)	(185)
Taxes	40	(58)
Litigation liabilities	151	0
Other	(12)	207
Net cash provided by (used in) operating activities	170	(41)
INVESTING ACTIVITIES
Payments for property, plant, and equipment	(186)	(174)
Capitalized software expenditures	(93)	(91)
Acquisitions, net of cash, cash equivalents, and restricted cash acquired	(4)	(8)
Proceeds from sales of businesses and investments, net	179	9
Other	(53)	(14)
Net cash used in investing activities	(157)	(278)
FINANCING ACTIVITIES
Proceeds from short-term borrowings	3,020	5,303
Repayments of short-term borrowings	(3,020)	(5,303)
Proceeds from issuances of long-term debt	498	0
Repayments of long-term debt	(1,636)	(5)
Payments for debt extinguishments	(184)	0
Common stock transactions:
Issuances	111	39
Share repurchases	(1,272)	(248)
Dividends paid	(134)	(140)
Exercise of put right by noncontrolling shareholders of McKesson Europe AG	(1,031)	(49)
Other	(246)	2
Net cash used in financing activities	(3,894)	(401)
Effect of exchange rate changes on cash, cash equivalents, and restricted cash	18	(63)
Net decrease in cash, cash equivalents, and restricted cash	(3,863)	(783)
Cash, cash equivalents, and restricted cash at beginning of period	6,396	4,023
Cash, cash equivalents, and restricted cash at end of period	2,533	3,240
Less: Restricted cash at end of period included in Prepaid expenses and other	(382)	(149)
Cash and cash equivalents at end of period	$ 2,151	$ 3,091