CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
OPERATING ACTIVITIES
Net income	$ 533	$ 494
Adjustments to reconcile to net cash used in operating activities:
Depreciation	80	75
Amortization	138	142
Long-lived asset impairment charges	104	5
Deferred taxes	36	28
Credits associated with last-in, first-out inventory method	(23)	(52)
Non-cash operating lease expense	90	83
Loss from sales of businesses and investments	0	2
Other non-cash items	194	9
Changes in assets and liabilities, net of acquisitions:
Receivables	(1,045)	2,291
Inventories	(901)	238
Drafts and accounts payable	(609)	(4,214)
Operating lease liabilities	(90)	(89)
Taxes	(54)	76
Litigation liabilities	74	0
Other	(149)	(150)
Net cash used in operating activities	(1,622)	(1,062)
INVESTING ACTIVITIES
Payments for property, plant, and equipment	(93)	(72)
Capitalized software expenditures	(66)	(45)
Acquisitions, net of cash, cash equivalents, and restricted cash acquired	(1)	(4)
Proceeds from sales of businesses and investments, net	83	7
Other	(22)	(16)
Net cash used in investing activities	(99)	(130)
FINANCING ACTIVITIES
Proceeds from short-term borrowings	0	5,303
Repayments of short-term borrowings	0	(5,303)
Repayments of long-term debt	(2)	(2)
Common stock transactions:
Issuances	71	21
Share repurchases	(1,008)	0
Dividends paid	(69)	(74)
Exercise of put right by noncontrolling shareholders of McKesson Europe AG	(1,031)	(49)
Other	(112)	165
Net cash provided by (used in) financing activities	(2,151)	61
Effect of exchange rate changes on cash, cash equivalents, and restricted cash	11	(28)
Net decrease in cash, cash equivalents, and restricted cash	(3,861)	(1,159)
Cash, cash equivalents, and restricted cash at beginning of period	6,396	4,023
Cash, cash equivalents, and restricted cash at end of period	2,535	2,864
Less: Restricted cash at end of period included in Prepaid expenses and other	(112)	(251)
Cash and cash equivalents at end of period	$ 2,423	$ 2,613