Stockholders' Equity and Earnings per Share (Details 3) - Mar. 31, 2013 - $ / shares	Total
Walgreens Warrant 1 [Member]
Class of Warrant or Right [Line Items]
Class of Warrant or Right, Date from which Warrants or Rights are Exercisable	Mar. 01, 2016
Class of Warrant or Right, Number of Securities Called by Warrants or Rights	11,348,456
Class of Warrant or Right, Exercise Price of Warrants or Rights	$ 51.50
Walgreens Warrant 2 [Member]
Class of Warrant or Right [Line Items]
Class of Warrant or Right, Date from which Warrants or Rights are Exercisable	Mar. 01, 2017
Class of Warrant or Right, Number of Securities Called by Warrants or Rights	11,348,456
Class of Warrant or Right, Exercise Price of Warrants or Rights	$ 52.50
Alliance Boots Warrant 1 [Member]
Class of Warrant or Right [Line Items]
Class of Warrant or Right, Date from which Warrants or Rights are Exercisable	Mar. 01, 2016
Class of Warrant or Right, Number of Securities Called by Warrants or Rights	11,348,456
Class of Warrant or Right, Exercise Price of Warrants or Rights	$ 51.50
Alliance Boots Warrant 2 [Member]
Class of Warrant or Right [Line Items]
Class of Warrant or Right, Date from which Warrants or Rights are Exercisable	Mar. 01, 2017
Class of Warrant or Right, Number of Securities Called by Warrants or Rights	11,348,456
Class of Warrant or Right, Exercise Price of Warrants or Rights	$ 52.50