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Stockholders' Equity - Share Repurchase Program (Details) - USD ($)
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Apr. 19, 2021
Jul. 25, 2017
Equity, Class of Treasury Stock [Line Items]        
Stock repurchased during period, value $ 141,000,000 $ 115,000,000    
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) 767,500      
Stock repurchased during period, value $ 150,000,000      
Stock repurchase program, remaining authorized repurchase amount $ 381,000,000      
Common Stock | Share Repurchase Program 2021 | Subsequent Event        
Equity, Class of Treasury Stock [Line Items]        
Stock repurchase program, authorized amount     $ 2,000,000,000