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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, 2020   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      
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)  
Balance (in shares) at Sep. 30, 2021   538,458,952      
Ending balance at Sep. 30, 2021 $ 15,171 $ 1,346 7,443 6,508 (126)
Balance (in shares) at Dec. 31, 2021 544,025,269 544,025,269      
Beginning balance at Dec. 31, 2021 $ 15,612 $ 1,360 7,803 6,572 (123)
Increase (Decrease) in Stockholders' Equity          
Net income 1,357     1,357  
Other comprehensive income 32       32
Dividends declared on common stock (USD per share)   $ 1.463      
Dividends declared on common stock (798)     (798)  
Issuances of common stock (in shares)   2,980,807      
Issuances of common stock 185 $ 8 177    
Share-based compensation $ (4)   (1) (3)  
Balance (in shares) at Sep. 30, 2022 547,006,076 547,006,076      
Ending balance at Sep. 30, 2022 $ 16,384 $ 1,368 7,979 7,128 (91)
Balance (in shares) at Jun. 30, 2022   546,807,793      
Beginning balance at Jun. 30, 2022 15,971 $ 1,367 7,960 6,747 (103)
Increase (Decrease) in Stockholders' Equity          
Net income 649     649  
Other comprehensive income 12       12
Dividends declared on common stock (USD per share)   $ 0.4875      
Dividends declared on common stock (267)     (267)  
Issuances of common stock (in shares)   198,283      
Issuances of common stock 14 $ 1 13    
Share-based compensation $ 5   6 (1)  
Balance (in shares) at Sep. 30, 2022 547,006,076 547,006,076      
Ending balance at Sep. 30, 2022 $ 16,384 $ 1,368 $ 7,979 $ 7,128 $ (91)