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Consolidated Statement of Changes in Equity (Unaudited) - USD ($)
$ in Millions
Total
Total
Common Shares
Common Stock and Capital Surplus
Retained Earnings
Accumulated Other Comp. Income (Loss)
Beginning Balance (shares) at Dec. 31, 2024     83,978,258      
Beginning Balance at Dec. 31, 2024   $ 4,466   $ 1,495 $ 3,211 $ (240)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net earnings $ 154 154     154  
Other comprehensive income (loss)   61       61
Dividends   (234)     (234)  
Shares issued:            
Exercise of stock options (shares)     18,932      
Exercise of stock options   1   1    
Restricted stock awards (shares)     166,297      
Other benefit plans (shares)     15,657      
Other benefit plans   2   2    
Dividend reinvestment plan (shares)     7,020      
Dividend reinvestment plan   1   1    
Stock-based compensation expense   4   4    
Shares acquired and retired (shares)     (462,398)      
Shares acquired and retired   (58)   (9) (49)  
Shares exchanged — benefit plans (shares)     (42,809)      
Shares exchanged — benefit plans   (5)   (1) (4)  
Forfeitures of restricted stock (shares)     (12,504)      
Ending Balance (shares) at Mar. 31, 2025     83,668,453      
Ending Balance at Mar. 31, 2025   4,392   1,493 3,078 (179)
Beginning Balance (shares) at Dec. 31, 2025 83,422,202   83,422,202      
Beginning Balance at Dec. 31, 2025   4,820   1,513 3,357 (50)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net earnings $ 191 191     191  
Other comprehensive income (loss)   (77)       (77)
Dividends   (199)     (199)  
Shares issued:            
Restricted stock awards (shares)     150,544      
Other benefit plans (shares)     16,112      
Other benefit plans   2   2    
Dividend reinvestment plan (shares)     6,080      
Dividend reinvestment plan   1   1    
Stock-based compensation expense   5   5    
Shares acquired and retired (shares)     (466,097)      
Shares acquired and retired   (60)   (9) (51)  
Shares exchanged — benefit plans (shares)     (38,736)      
Shares exchanged — benefit plans   (5)   (1) (4)  
Forfeitures of restricted stock (shares)     (3,810)      
Ending Balance (shares) at Mar. 31, 2026 83,086,295   83,086,295      
Ending Balance at Mar. 31, 2026   $ 4,678   $ 1,511 $ 3,294 $ (127)