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Condensed Statements of Consolidated Changes in Equity (Unaudited) - USD ($)
$ in Millions
Total
Cumulative Preferred Stock
Common Stock
Additional Paid-in-Capital
Retained Earnings
Accumulated Other Comprehensive Loss
Balance, beginning of period (in shares) at Dec. 31, 2022   1,000,000        
Balance, beginning of period at Dec. 31, 2022   $ 790 $ 6 $ 8,568 $ 709 $ (31)
Balance, beginning of period (in shares) at Dec. 31, 2022     630,000,000      
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Issuances of Common Stock, net of issuance costs       0    
Issuances related to benefit and investment plans (in shares)     1,000,000      
Issuances related to benefit and investment plans     $ 0 (10)    
Net income $ 325       325  
Other comprehensive income (loss)           (1)
Balance, end of period (in shares) at Mar. 31, 2023   1,000,000        
Balance, end of period at Mar. 31, 2023 10,356 $ 790 $ 6 8,558 1,034 (32)
Balance, end of period (in shares) at Mar. 31, 2023     631,000,000      
Balance, beginning of period (in shares) at Dec. 31, 2023   0        
Balance, beginning of period at Dec. 31, 2023 $ 9,667 $ 0 $ 6 8,604 1,092 (35)
Balance, beginning of period (in shares) at Dec. 31, 2023 631,225,829   631,000,000      
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Issuances of Common Stock, net of issuance costs       3    
Issuances related to benefit and investment plans (in shares)     2,000,000      
Issuances related to benefit and investment plans     $ 0 (24)    
Net income $ 350       350  
Other comprehensive income (loss)           2
Balance, end of period (in shares) at Mar. 31, 2024   0        
Balance, end of period at Mar. 31, 2024 $ 9,998 $ 0 $ 6 $ 8,583 $ 1,442 $ (33)
Balance, end of period (in shares) at Mar. 31, 2024 633,166,053   633,000,000