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CONSOLIDATED STATEMENTS OF COMMON STOCKHOLDERS' EQUITY (UNAUDITED) - USD ($)
$ in Millions
Total
Common Stock
Additional Paid In Capital
Retained Earnings
Accumulated Other Comprehensive Loss
Balance (in shares) at Dec. 31, 2019   524,539,000      
Beginning balance at Dec. 31, 2019 $ 13,239 $ 1,311 $ 6,656 $ 5,413 $ (141)
Increase (Decrease) in Stockholders' Equity          
Net income 1,185     1,185  
Other comprehensive income (2)       (2)
Dividends declared on common stock (USD per share)   $ 1.29      
Dividends declared on common stock (679)     (679)  
Issuances of common stock (in shares)   968,299      
Issuances of common stock 33 $ 3 30    
Stock Repurchased During Period, Value (4) $ (4)      
Stock Repurchased During Period, Shares   (54,475)      
Share-based compensation 7   12 (5)  
Credit Losses, Topic 326 (ASC Topic 326) (2)     (2)  
Balance (in shares) at Sep. 30, 2020   525,452,824      
Ending balance at Sep. 30, 2020 13,777 $ 1,314 6,694 5,912 (143)
Balance (in shares) at Jun. 30, 2020   525,204,978      
Beginning balance at Jun. 30, 2020 13,385 $ 1,313 6,679 5,538 (145)
Increase (Decrease) in Stockholders' Equity          
Net income 603     603  
Other comprehensive income 2       2
Dividends declared on common stock (USD per share)   $ 0.43      
Dividends declared on common stock (226)     (226)  
Issuances of common stock (in shares)   302,321      
Issuances of common stock 10 $ 1 9    
Stock Repurchased During Period, Value (4) $ (4)      
Stock Repurchased During Period, Shares   (54,475)      
Share-based compensation 7   10 (3)  
Balance (in shares) at Sep. 30, 2020   525,452,824      
Ending balance at Sep. 30, 2020 $ 13,777 $ 1,314 6,694 5,912 (143)
Balance (in shares) at Dec. 31, 2020 537,438,394 537,438,394      
Beginning balance at Dec. 31, 2020 $ 14,575 $ 1,344 7,404 5,968 (141)
Increase (Decrease) in Stockholders' Equity          
Net income 1,282     1,282  
Other comprehensive income 15       15
Dividends declared on common stock (USD per share)   $ 1.373      
Dividends declared on common stock (739)     (739)  
Issuances of common stock (in shares)   1,020,558      
Issuances of common stock 40 $ 2 38    
Share-based compensation $ (2)   1 (3)  
Balance (in shares) at Sep. 30, 2021 538,458,952 538,458,952      
Ending balance at Sep. 30, 2021 $ 15,171 $ 1,346 7,443 6,508 (126)
Balance (in shares) at Jun. 30, 2021   538,305,927      
Beginning balance at Jun. 30, 2021 14,792 $ 1,346 7,435 6,146 (135)
Increase (Decrease) in Stockholders' Equity          
Net income 609     609  
Other comprehensive income 9       9
Dividends declared on common stock (USD per share)   $ 0.4575      
Dividends declared on common stock (247)     (247)  
Issuances of common stock (in shares)   153,025      
Issuances of common stock 10 $ 0 10    
Share-based compensation $ (2)   (2) 0  
Balance (in shares) at Sep. 30, 2021 538,458,952 538,458,952      
Ending balance at Sep. 30, 2021 $ 15,171 $ 1,346 $ 7,443 $ 6,508 $ (126)