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Business Combinations - Acquisition of Vantage & Biologics (Details) $ in Millions		12 Months Ended
	Apr. 01, 2016 USD ($) cancer_treatment_facility state	Mar. 31, 2017 USD ($)	Mar. 31, 2016 USD ($)	Mar. 31, 2015 USD ($)
Business Acquisition [Line Items]
Cash purchase consideration		$ 4,237	$ 40	$ 170
Goodwill		10,586	$ 9,786	$ 9,817
Vantage
Business Acquisition [Line Items]
Number of pharmacies | cancer_treatment_facility	51
Number of states | state	13
Cash purchase consideration	$ 515
Goodwill		558
Acquired identifiable intangibles		22
Fair value of noncontrolling interest		89
Biologics
Business Acquisition [Line Items]
Cash purchase consideration	$ 692
Goodwill		574
Acquired identifiable intangibles		193
Noncompete Agreements | Vantage
Business Acquisition [Line Items]
Acquired identifiable intangibles		$ 13
Weighted average life		4 years
Trade Names | Biologics
Business Acquisition [Line Items]
Acquired identifiable intangibles		$ 170
Weighted average life		9 years

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Amount of intangible assets, excluding goodwill, acquired at the acquisition date.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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