CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY - USD ($) shares in Millions, $ in Millions	Total	Common Stock	Additional Paid-in Capital	Other Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Treasury	Noncontrolling Interests
Beginning balance, common stock (in shares) at Mar. 31, 2013		376.0
Beginning balance at Mar. 31, 2013	$ 7,070	$ 4	$ 6,078	$ 14	$ 10,402	$ (65)	$ (9,363)	$ 0
Beginning balance, treasury common shares at Mar. 31, 2013							(149.0)
Issuance of shares under employee plans (in shares)		5.0					1.0
Issuance of shares under employee plans, tax portion of RSU issued	47		177				$ (130)
Share-based compensation	160		160
Tax benefit related to issuance of shares under employee plans	92		92
Acquisition of Celesio	1,500							1,500
Conversion of Celesio convertible bonds	313		33					280
Other comprehensive income	83					62		21
Net income (loss)	1,258				1,263			(5)
Repurchase of common stock	0		14				(14)
Cash dividends declared	(214)				(214)
Other	9		(2)	9	2
Ending balance common stock (in shares) at Mar. 31, 2014		381.0
Ending balance at Mar. 31, 2014	10,318	$ 4	6,552	23	11,453	(3)	$ (9,507)	1,796
Ending balance, treasury common shares at Mar. 31, 2014							(150.0)
Issuance of shares under employee plans (in shares)		3.0
Issuance of shares under employee plans, tax portion of RSU issued	43		152				$ (109)
Share-based compensation	165		165
Tax benefit related to issuance of shares under employee plans	105		105
Conversion of Celesio convertible bonds	0
Purchase of noncontrolling interests	(62)		(2)					(60)
Reclassification of noncontrolling interests to redeemable noncontrolling interests	(1,500)							(1,500)
Other comprehensive income	(1,884)					(1,710)		(174)
Net income (loss)	1,481				1,476			5
Repurchase of common stock (in shares)							(2.0)
Repurchase of common stock	(340)						$ (340)
Cash dividends declared	(226)				(226)
Other	(15)		(4)	(30)	2			17
Ending balance common stock (in shares) at Mar. 31, 2015		384.0
Ending balance at Mar. 31, 2015	$ 8,085	$ 4	6,968	(7)	12,705	(1,713)	$ (9,956)	84
Ending balance, treasury common shares at Mar. 31, 2015	(152.0)						(152.0)
Issuance of shares under employee plans (in shares)		3.0					1.0
Issuance of shares under employee plans, tax portion of RSU issued	$ 14		123				$ (109)
Share-based compensation	130		130
Tax benefit related to issuance of shares under employee plans	117		117
Conversion of Celesio convertible bonds	0
Other comprehensive income	152					152
Net income (loss)	2,266				2,258			8
Repurchase of common stock (in shares)							(9.0)
Repurchase of common stock	$ (1,504)						$ (1,504)
Retirement of common stock (in shares)	(115.5)	(116.0)					(116.0)
Retirement of common stock	$ 0	$ (1)	(1,493)		(6,354)		$ (7,848)
Cash dividends declared	(249)				(249)
Other	(3)			5				(8)
Ending balance common stock (in shares) at Mar. 31, 2016		271.0
Ending balance at Mar. 31, 2016	$ 9,008	$ 3	$ 5,845	$ (2)	$ 8,360	$ (1,561)	$ (3,721)	$ 84
Ending balance, treasury common shares at Mar. 31, 2016	(46.0)						(46.0)