Shareholders' Equity (Details) - September 23, 2015 - USD ($)	Sep. 28, 2015	Oct. 31, 2015	Sep. 23, 2015
Class of Stock [Line Items]
Value of shares repurchased	$ 1,500,000,000.0	$ (1,500,000,000)	$ 1,500,000,000.0
Number of shares acquired	32,319,392