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Stockholders' Equity - Share Repurchase Program (Details) - USD ($)
3 Months Ended 6 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Jun. 30, 2020
Jul. 25, 2017
Equity, Class of Treasury Stock [Line Items]        
Stock repurchased during period, value $ 115,000,000 $ 40,000,000    
Common Stock | Share Repurchase Program 2017        
Equity, Class of Treasury Stock [Line Items]        
Stock repurchase program, authorized amount       $ 2,000,000,000
Stock repurchased during period (in shares)     902,000  
Stock repurchased during period, value     $ 121,000,000  
Stock repurchase program, remaining authorized repurchase amount     $ 531,000,000