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Stockholders' Equity (Stock Offerings) (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended
Mar. 26, 2021
Mar. 31, 2021
Mar. 31, 2020
Class of Stock [Line Items]      
Proceeds from issuance of common stock $ 1,670 $ 1,672 $ 0
Proceeds from issuance of preferred stock $ 983 $ 983 $ 0
Common Class B [Member]      
Class of Stock [Line Items]      
Stock issuance (shares) 20    
Shares issued (USD per share) $ 85    
Series A Convertible Preferred Stock [Member]      
Class of Stock [Line Items]      
Stock issuance (shares) 10    
Preferred stock, percentage 5.75% 5.75%  
Liquidation preference (in dollars per share) $ 100