Business Combinations - Fair Values Recognized of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Millions			12 Months Ended
	Dec. 28, 2016	Apr. 01, 2016	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Business Acquisition [Line Items]
Goodwill			$ 10,586	$ 9,786	$ 9,817
Purchase consideration paid in cash, net of cash acquired			$ 4,237	$ 40	$ 170
Rexall Health
Business Acquisition [Line Items]
Receivables	$ 114
Receivables	0
Inventory	235
Inventory	(36)
Other current assets, net of cash and cash equivalents acquired	216
Other current assets, net of cash and cash equivalents acquired	75
Goodwill	957
Goodwill	(185)
Intangible assets	855
Intangible assets	199
Other long-term assets	116
Other long-term assets	(45)
Current liabilities	(154)
Current liabilities	0
Other long-term liabilities	(55)
Other long-term liabilities	(10)
Fair value of net assets, less cash and cash equivalents	2,284
Fair value of net assets, less cash and cash equivalents	(2)
Less: Settlement of pre-existing payables	163
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Settlement of Liability	(2)
Purchase consideration paid in cash, net of cash acquired	2,121
Rexall Health | Amounts Previously Recognized as of Acquisition Date (Provisional)
Business Acquisition [Line Items]
Receivables	114
Inventory	271
Other current assets, net of cash and cash equivalents acquired	141
Goodwill	1,142
Intangible assets	656
Other long-term assets	161
Current liabilities	(154)
Other long-term liabilities	(45)
Fair value of net assets, less cash and cash equivalents	2,286
Less: Settlement of pre-existing payables	165
Purchase consideration paid in cash, net of cash acquired	$ 2,121
Vantage & Biologics
Business Acquisition [Line Items]
Receivables		$ 101
Receivables		(5)
Other current assets, net of cash and cash equivalents acquired		19
Other current assets, net of cash and cash equivalents acquired		0
Goodwill		1,132
Goodwill		(87)
Intangible assets		215
Intangible assets		79
Other long-term assets		130
Other long-term assets		54
Current liabilities		(132)
Current liabilities		(15)
Other long-term liabilities		(169)
Other long-term liabilities		(89)
Fair value of net assets, less cash and cash equivalents		1,296
Fair value of net assets, less cash and cash equivalents		(63)
Less: Noncontrolling Interests		(89)
Less: Noncontrolling Interests		63
Net assets acquired, net of cash and cash equivalents		1,207
Net assets acquired, net of cash and cash equivalents		0
Vantage & Biologics | Amounts Previously Recognized as of Acquisition Date (Provisional)
Business Acquisition [Line Items]
Receivables		106
Other current assets, net of cash and cash equivalents acquired		19
Goodwill		1,219
Intangible assets		136
Other long-term assets		76
Current liabilities		(117)
Other long-term liabilities		(80)
Fair value of net assets, less cash and cash equivalents		1,359
Less: Noncontrolling Interests		(152)
Net assets acquired, net of cash and cash equivalents		$ 1,207