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Stockholders' Equity (Narrative) (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2008
Disclosure of Repurchase Agreements [Abstract]                        
Common Stock, Dividends, Per Share, Cash Paid $ 0.625 [1] $ 0.625 [1] $ 0.625 [1] $ 0.50 [1] $ 0.50 [1] $ 0.50 [1] $ 0.50 [1] $ 0.50 [1] $ 2.38 $ 2.00 $ 1.93  
Treasury Stock, Value, Acquired, Cost Method                 $ 350      
Stock Repurchase Program, Authorized Amount                       500
Stock Repurchased During Period, Shares                 2.5      
Stock Repurchase Program, Remaining Authorized Repurchase Amount                 $ 0      
[1] The quarterly earnings per share amounts will not necessarily add to the earnings per share computed for the year due to the method used in calculating per share data.