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Business Combinations (Details) € in Millions, £ in Millions, $ in Millions, CAD in Billions									3 Months Ended	9 Months Ended
	Dec. 28, 2016 USD ($) pharmacy	Dec. 28, 2016 CAD	Aug. 31, 2016 GBP (£)	Aug. 31, 2016 USD ($)	Apr. 01, 2016 EUR (€) cancer_treatment_facility state	Apr. 01, 2016 USD ($) cancer_treatment_facility state	Feb. 29, 2016 GBP (£)	Feb. 29, 2016 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Mar. 31, 2016 USD ($)
Business Acquisition [Line Items]
Net purchase consideration										$ 4,174	$ 25
Goodwill									$ 10,612	10,612		$ 9,786
Held-for-sale
Business Acquisition [Line Items]
Current assets held for sale									110	110		635
Current liabilities held for sale									1	1		$ 660
Rexall Health
Business Acquisition [Line Items]
Net purchase consideration	$ 2,121
Goodwill	1,142
Intangible assets	656
Rexall Health | CANADA
Business Acquisition [Line Items]
Net purchase consideration	$ 2,100	CAD 2.9
Number of cancer treatment facilities acquired | pharmacy	470
Total assets acquired, excluding goodwill and intangibles	$ 687
Total liabilities acquired, excluding goodwill and intangibles	199
Goodwill	1,100
Goodwill expected to be tax deductible	860
Intangible assets	$ 656
Vantage
Business Acquisition [Line Items]
Net purchase consideration						$ 515
Number of cancer treatment facilities acquired | cancer_treatment_facility					51	51
Goodwill									516	516
Intangible assets									15	15
Number of states | state					13	13
Fair value of noncontrolling interests									93	93
Vantage | Noncompete Agreements
Business Acquisition [Line Items]
Intangible assets									7	$ 7
Estimated weighted average life of the acquired intangibles										4 years
Biologics
Business Acquisition [Line Items]
Net purchase consideration						$ 692
Goodwill									572	$ 572
Intangible assets									193	193
Biologics | Trade names
Business Acquisition [Line Items]
Intangible assets									170	$ 170
Estimated weighted average life of the acquired intangibles										9 years
Vantage and Biologics
Business Acquisition [Line Items]
Goodwill									1,088	$ 1,088
Intangible assets									208	208
Fair value of noncontrolling interests									93	93
UDG
Business Acquisition [Line Items]
Net purchase consideration					€ 380	$ 431
Total assets acquired, excluding goodwill and intangibles									467	467
Total liabilities acquired, excluding goodwill and intangibles									332	332
Increase in goodwill recognized									16
UDG | Customer scripts
Business Acquisition [Line Items]
Intangible assets									$ 115	$ 115
Estimated weighted average life of the acquired intangibles										10 years
Sainsbury | U.K.
Business Acquisition [Line Items]
Total assets acquired, excluding goodwill and intangibles				$ 29
Total liabilities acquired, excluding goodwill and intangibles				18
Goodwill				92
Gross purchase consideration paid			£ 128	168
Cash payment made as part of purchase consideration							£ 125	$ 174
Interest rate (percent)							0.033	0.033
Sainsbury | U.K. | Pharmacy licenses
Business Acquisition [Line Items]
Intangible assets				$ 65
Estimated weighted average life of the acquired intangibles			15 years	15 years

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