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Stockholders' Equity (Narrative) (Details) - USD ($)
3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2016
Mar. 31, 2016
Dec. 31, 2015
Mar. 31, 2015
Jun. 30, 2016
Jun. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Apr. 18, 2016
Apr. 14, 2014
Equity, Class of Treasury Stock [Line Items]                          
Dividends paid, per share (USD per share) $ 1.00 $ 0.90 $ 0.90 $ 0.75 $ 1.00 $ 0.90 $ 1.00 $ 0.90 $ 3.9 $ 3.45 $ 2.875    
Stock repurchased during period, value                 $ 506,000,000 $ 163,000,000      
Common Stock | Share Repurchase Program 2014                          
Equity, Class of Treasury Stock [Line Items]                          
Stock repurchase program, authorized amount                         $ 500,000,000
Stock repurchased during period, shares (in shares)   1,507,100                      
Stock repurchased during period, value   $ 225,000,000                      
Stock repurchase program, remaining authorized repurchase amount   $ 0                      
Common Stock | Share Repurchase Program 2016                          
Equity, Class of Treasury Stock [Line Items]                          
Stock repurchase program, authorized amount                       $ 1,000,000,000  
Stock repurchased during period, shares (in shares)                 1,749,600        
Stock repurchased during period, value                 $ 300,000,000        
Stock repurchase program, remaining authorized repurchase amount $ 700,000,000               $ 700,000,000