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Common Stock Repurchases (Details) (USD $)
Share data in Millions, unless otherwise specified
1 Months Ended 6 Months Ended
Jul. 31, 2013
Dec. 27, 2014
Common Stock Repurchases [Abstract]    
Stock repurchase program, authorized amount $ 1,000,000,000us-gaap_StockRepurchaseProgramAuthorizedAmount  
Shares of common stock repurchased   4.1us-gaap_TreasuryStockSharesAcquired
Value of common stock repurchased   122,400,000us-gaap_TreasuryStockValueAcquiredParValueMethod
Stock repurchase program, remaining authorized amount   $ 639,500,000us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount