Acquisitions, Consideration Paid (Details) £ in Millions, $ in Millions			6 Months Ended
	Dec. 31, 2014 USD ($)	Dec. 31, 2014 GBP (£)	Feb. 29, 2016 USD ($)
Consideration paid [Abstract]
Cash	$ 4,900	£ 3,133
Total consideration transferred	15,900		$ 13,300
Fair value of the investment in Alliance Boots held before the Second Step Transaction	$ 11,000
Alliance Boots [Member]
Consideration paid [Abstract]
Cash			4,874
Common stock			10,977
Total consideration transferred			15,851
Less: consideration attributed to WBAD			(2,559)
Total consideration after attributed amount to WBAD			13,292
Fair value of the investment in Alliance Boots held before the Second Step Transaction			8,149
Total consideration			$ 21,441