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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, 2023     83,635,807      
Beginning Balance at Dec. 31, 2023   $ 4,258   $ 1,456 $ 3,121 $ (319)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net earnings $ 632 632     632  
Other comprehensive income (loss)   183       183
Dividends   (387)     (387)  
Shares issued:            
Exercise of stock options (shares)     110,631      
Exercise of stock options   5   5    
Restricted stock awards (shares)     157,681      
Other benefit plans (shares)     72,074      
Other benefit plans   9   9    
Dividend reinvestment plan (shares)     11,910      
Dividend reinvestment plan   2   2    
Stock-based compensation expense   13   13    
Shares acquired and retired (shares)     0      
Shares acquired and retired   0   0 0  
Shares exchanged — benefit plans (shares)     (53,362)      
Shares exchanged — benefit plans   (7)   (1) (6)  
Forfeitures of restricted stock (shares)     (11,295)      
Ending Balance (shares) at Sep. 30, 2024     83,923,446      
Ending Balance at Sep. 30, 2024   4,708   1,484 3,360 (136)
Beginning Balance (shares) at Jun. 30, 2024     83,897,267      
Beginning Balance at Jun. 30, 2024   4,384   1,476 3,239 (331)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net earnings $ 181 181     181  
Other comprehensive income (loss)   195       195
Dividends   (59)     (59)  
Shares issued:            
Exercise of stock options (shares)     14,497      
Exercise of stock options   1   1    
Restricted stock awards (shares)     0      
Other benefit plans (shares)     20,913      
Other benefit plans   2   2    
Dividend reinvestment plan (shares)     1,842      
Dividend reinvestment plan   1   1    
Stock-based compensation expense   4   4    
Shares acquired and retired (shares)     0      
Shares acquired and retired   0   0 0  
Shares exchanged — benefit plans (shares)     (5,471)      
Shares exchanged — benefit plans   (1)   0 (1)  
Forfeitures of restricted stock (shares)     (5,602)      
Ending Balance (shares) at Sep. 30, 2024     83,923,446      
Ending Balance at Sep. 30, 2024   4,708   1,484 3,360 (136)
Beginning Balance (shares) at Dec. 31, 2024 83,978,258   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 $ 543 543     543  
Other comprehensive income (loss)   167       167
Dividends   (368)     (368)  
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)     75,833      
Other benefit plans   10   10    
Dividend reinvestment plan (shares)     11,154      
Dividend reinvestment plan   1   1    
Stock-based compensation expense   13   13    
Shares acquired and retired (shares)     (788,134)      
Shares acquired and retired   (98)   (15) (83)  
Shares exchanged — benefit plans (shares)     (43,387)      
Shares exchanged — benefit plans   (5)   (1) (4)  
Forfeitures of restricted stock (shares)     (17,523)      
Ending Balance (shares) at Sep. 30, 2025 83,401,430   83,401,430      
Ending Balance at Sep. 30, 2025   4,730   1,504 3,299 (73)
Beginning Balance (shares) at Jun. 30, 2025     83,385,661      
Beginning Balance at Jun. 30, 2025   4,516   1,497 3,151 (132)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net earnings $ 215 215     215  
Other comprehensive income (loss)   59       59
Dividends   (66)     (66)  
Shares issued:            
Exercise of stock options (shares)     0      
Exercise of stock options   0   0    
Restricted stock awards (shares)     0      
Other benefit plans (shares)     22,269      
Other benefit plans   3   3    
Dividend reinvestment plan (shares)     2,058      
Dividend reinvestment plan   0   0    
Stock-based compensation expense   4   4    
Shares acquired and retired (shares)     (6,000)      
Shares acquired and retired   (1)   0 (1)  
Shares exchanged — benefit plans (shares)     (437)      
Shares exchanged — benefit plans   0   0 0  
Forfeitures of restricted stock (shares)     (2,121)      
Ending Balance (shares) at Sep. 30, 2025 83,401,430   83,401,430      
Ending Balance at Sep. 30, 2025   $ 4,730   $ 1,504 $ 3,299 $ (73)