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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Statement of Comprehensive Income [Abstract]
Net Income	$ 553	$ 56	$ 473	$ 421
Other Comprehensive Income, Net of Tax
Foreign currency translation adjustments arising during the period	26	265	(103)	577
Unrealized gains (losses) on cash flow hedges arising during the period	2	(3)	2	11
Retirement-related benefit plans	4	(3)	12	(8)
Other Comprehensive Income (Loss), Net of Tax	32	259	(89)	580
Comprehensive Income	585	315	384	1,001
Comprehensive Income Attributable to Noncontrolling Interests	(47)	(88)	(68)	(260)
Comprehensive Income Attributable to McKesson Corporation	$ 538	$ 227	$ 316	$ 741

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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