Business Combinations - Fair Values of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Millions		6 Months Ended	9 Months Ended
	Dec. 28, 2016	Dec. 31, 2016	Dec. 31, 2016	Dec. 31, 2015	Jun. 30, 2016	Mar. 31, 2016
Business Acquisition [Line Items]
Goodwill		$ 10,612	$ 10,612			$ 9,786
Purchase consideration paid in cash, net of cash acquired			4,174	$ 25
Rexall Health
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 and Biologics
Business Acquisition [Line Items]
Receivables		99	99
Adjustment - Receivables		(7)
Other current assets, net of cash and cash equivalents acquired		19	19
Adjustment - Other current assets, net of cash and cash equivalents acquired		0
Goodwill		1,088	1,088
Adjustment - Goodwill		(131)
Intangible assets		208	208
Adjustment - Intangible assets		72
Other long-term assets		113	113
Adjustment - Other long-term assets		37
Current liabilities		(119)	(119)
Adjustment - Current liabilities		(2)
Other long-term liabilities		(108)	(108)
Adjustment - Other long-term liabilities		(28)
Fair value of net assets, less cash and cash equivalents		1,300	1,300
Adjustment - Fair value of net assets, less cash and cash equivalents		(59)
Less: Noncontrolling Interests		(93)	(93)
Adjustment - Less: Noncontrolling Interests		59
Net assets acquired, net of cash and cash equivalents		1,207	$ 1,207
Adjustment - Net assets acquired, net of cash and cash equivalents		$ 0
Vantage and Biologics | Previously Reported
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