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Business Combinations - Acquisition of Rexall Health (Details) CAD in Billions			12 Months Ended
	Dec. 28, 2016 USD ($) pharmacy	Dec. 28, 2016 CAD	Mar. 31, 2017 USD ($)	Mar. 31, 2016 USD ($)	Mar. 31, 2015 USD ($)
Business Acquisition [Line Items]
Cash purchase consideration			$ 4,237,000,000	$ 40,000,000	$ 170,000,000
Goodwill			10,586,000,000	9,786,000,000	$ 9,817,000,000
Total assets of discontinued operations			24,000,000	635,000,000
Total liabilities of discontinued operations			43,000,000	$ 660,000,000
Rexall Health
Business Acquisition [Line Items]
Cash purchase consideration	$ 2,121,000,000
Goodwill	957,000,000
Acquired identifiable intangibles	$ 855,000,000
CANADA | Rexall Health
Business Acquisition [Line Items]
Number of pharmacies | pharmacy	470
Cash purchase consideration	$ 2,100,000,000	CAD 2.9
Fair value of assets acquired (excluding goodwill and intangibles)			681,000,000
Fair value of liabilities assumed			209,000,000
Goodwill			1,000,000,000
Acquired identifiable intangibles			855,000,000
Held-for-sale
Business Acquisition [Line Items]
Total assets of discontinued operations			184,000,000
Total liabilities of discontinued operations			$ 0
Held-for-sale | CANADA | Rexall Health
Business Acquisition [Line Items]
Number of pharmacies | pharmacy	26
Trade Names | Held-for-sale | CANADA | Rexall Health
Business Acquisition [Line Items]
Weighted average life	19 years	19 years
Customer Relationships | Held-for-sale | CANADA | Rexall Health
Business Acquisition [Line Items]
Weighted average life	19 years	19 years

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