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Stockholders' Equity - Share Repurchase Program (Details) - Common Stock - Share Repurchase Program 2017 - USD ($)
6 Months Ended
Jun. 30, 2018
Jul. 25, 2017
Equity, Class of Treasury Stock [Line Items]    
Stock repurchase program, authorized amount   $ 2,000,000,000
Stock repurchased during period (in shares) 6,269,591  
Stock repurchased during period, value $ 1,000,000,000  
Stock repurchase program, remaining authorized repurchase amount $ 950,000,000