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Stockholders' Equity - Repurchase Program (Details) - Common Stock - USD ($)
3 Months Ended 6 Months Ended
Mar. 31, 2016
Jun. 30, 2016
Apr. 18, 2016
Apr. 14, 2014
Share Repurchase Program 2014        
Equity, Class of Treasury Stock [Line Items]        
Stock repurchase program, authorized amount       $ 500,000,000
Stock repurchased during period (in shares) 1,507,100      
Stock repurchased during period $ 225,000,000      
Share Repurchase Program 2016        
Equity, Class of Treasury Stock [Line Items]        
Stock repurchase program, authorized amount     $ 1,000,000,000  
Stock repurchased during period (in shares)   567,700    
Stock repurchased during period   $ 100,000,000    
Stock repurchase program, remaining authorized repurchase amount $ 0 $ 900,000,000