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Business Combinations - Acquisition of Celesio AG (Details) shares in Millions, $ in Millions		2 Months Ended	12 Months Ended
	Feb. 06, 2014 USD ($) country	Mar. 31, 2014 USD ($) shares	Mar. 31, 2016 USD ($)	Mar. 31, 2015 USD ($)	Mar. 31, 2014 USD ($)
Business Acquisition [Line Items]
Cash consideration			$ 40	$ 170	$ 4,634
Goodwill		$ 9,927	$ 9,786	9,817	$ 9,927
Celesio
Business Acquisition [Line Items]
Percentage of outstanding common shares	77.60%
Cash consideration	$ 4,500
Fully diluted common shares (as a percent)	75.60%
Fair value	$ 2,300
Number of countries | country	14
Additional common shares from conversion | shares		20.9
Cash amount from conversion		$ 30
Percentage of outstanding common shares		75.40%			75.40%
Acquired identifiable intangibles				2,300
Fair value of noncontrolling interest				1,505
Goodwill				$ 4,200

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The number of shares issued in exchange for the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or payments in the period.

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