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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015
Statement of Comprehensive Income [Abstract]
Net Income	$ 646	$ 647	$ 1,530	$ 1,866
Other Comprehensive Income (Loss), Net of Tax
Foreign currency translation adjustments arising during period	(398)	(246)	(762)	(142)
Unrealized gains (losses) on cash flow hedges arising during period	(14)	(1)	(20)	5
Retirement-related benefit plans	8	15	20	(2)
Other Comprehensive Income (Loss), Net of Tax	(404)	(232)	(762)	(139)
Comprehensive Income	242	415	768	1,727
Comprehensive (Income) Loss Attributable to Noncontrolling Interests	17	18	47	(32)
Comprehensive Income Attributable to McKesson Corporation	$ 259	$ 433	$ 815	$ 1,695

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