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Shareholders' Equity (Narrative) (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Stockholders' Equity Note [Abstract]  
Stock Repurchase Program, Authorized Amount $ 2,000,000,000.0us-gaap_StockRepurchaseProgramAuthorizedAmount1
Stock Repurchase Program, Number of Shares Authorized to be Repurchased 35,000,000.0us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased
Stock Repurchased During Period, Shares 0us-gaap_StockRepurchasedDuringPeriodShares