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Stockholders' Equity (Narrative) (Details) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Apr. 14, 2014
Equity, Class of Treasury Stock [Line Items]                        
Dividends paid, per share (USD per share) $ 0.90 $ 0.90 $ 0.90 $ 0.75 $ 0.75 $ 0.75 $ 0.75 $ 0.625 $ 3.45 $ 2.88 $ 2.38  
Stock repurchased during period, value                 $ 163,000,000   $ 206,000,000  
Common Stock | Share Repurchase Program 2014                        
Equity, Class of Treasury Stock [Line Items]                        
Stock repurchase program, authorized amount (shares)                       $ 500,000,000
Stock repurchased during period, shares (shares)                 1,505,299 165,900    
Stock repurchased during period, value                 $ 250,000,000 $ 25,000,000    
Stock repurchase program, remaining authorized repurchase amount $ 225,000,000               $ 225,000,000