v3.25.4
Pension And Postretirement Benefits (Narrative) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2026
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2035
Dec. 31, 2032
Defined Benefit Plan Disclosure [Line Items]            
Combined net pension and postretirement cost   $ (1,121) $ (1,817) $ (1,017)    
Increase (decrease) in plan benefit obligations due to change in assumed rates   $ (1,588) $ (1,883) (2,552)    
Composite rate of compensation increase for determining benefit obligation   3.00% 3.00%      
Benefit cost of the contributory savings plans   $ 546 $ 565 570    
Notional amount of contracts   35,741 34,884      
Pension Benefits            
Defined Benefit Plan Disclosure [Line Items]            
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Remeasurement due to Settlement       8,067    
Defined Benefit Plan, Plan Assets, Contributions by Employer   1,153 3      
Settlement gain (loss)   0 0 363    
Accumulated benefit obligation for pension plans   30,069 30,322      
Combined net pension and postretirement cost   $ 47 $ (188) $ 1,041    
Discount rate for determining projected benefit obligation   5.50% 5.70% 5.00%    
Decrease in discount rate over prior year   (0.20%) 0.70%      
Increase (decrease) in plan benefit obligations due to change in assumed rates   $ 680 $ (1,994)      
Long-term rate of return on plan assets   7.75% 7.75% 7.50%    
Composite rate of compensation increase for determining benefit obligation   3.00% 3.00% 3.00%    
Preferred equity interest value   $ 28,677 $ 27,919 $ 30,098    
Aggregate percentage of the fair value of investments to the fair value of total plan assets held as of the measurement date   100.00% 100.00%      
Employer voluntary contribution amount   $ 1,150        
Notional amount of contracts   7,300        
Pension Benefits | Level 3            
Defined Benefit Plan Disclosure [Line Items]            
Preferred equity interest value   2,419 $ 2,314 2,957    
Postretirement Benefits            
Defined Benefit Plan Disclosure [Line Items]            
Defined Benefit Plan, Plan Assets, Contributions by Employer   0 0      
Settlement gain (loss)   0 0 0    
Combined net pension and postretirement cost   $ (1,168) $ (1,629) $ (2,058)    
Discount rate for determining projected benefit obligation   5.30% 5.60% 5.00%    
Decrease in discount rate over prior year   (0.30%) 0.60%      
Increase (decrease) in plan benefit obligations due to change in assumed rates   $ 167 $ (317)      
Long-term rate of return on plan assets   4.00% 4.00% 6.50%    
Composite rate of compensation increase for determining benefit obligation   3.00% 3.00% 3.00%    
Preferred equity interest value   $ 722 $ 1,144 $ 1,763    
Aggregate percentage of the fair value of investments to the fair value of total plan assets held as of the measurement date   100.00% 100.00%      
Postretirement Benefits | Level 3            
Defined Benefit Plan Disclosure [Line Items]            
Preferred equity interest value   $ 0 $ 0      
Supplemental Employee Retirement Plan            
Defined Benefit Plan Disclosure [Line Items]            
Combined net pension and postretirement cost   $ 92 $ 18      
Discount rate for determining projected benefit obligation   5.10% 5.50%      
Projected benefit obligation   $ 1,199 $ 1,305      
Deferred compensation expense   $ 96 $ 152 $ 101    
Prescription Drug Cost - Eligible Participants | Postretirement Benefits            
Defined Benefit Plan Disclosure [Line Items]            
Ultimate Health Care Cost Trend Rate   8.25%        
Prescription Drug Cost - Eligible Participants | Healthcare Benefits            
Defined Benefit Plan Disclosure [Line Items]            
Assumed annual and ultimate health care cost trend rate for next fiscal year   8.25%        
Medical Cost - Eligible Participants | Postretirement Benefits            
Defined Benefit Plan Disclosure [Line Items]            
Ultimate Health Care Cost Trend Rate   8.25%        
Medical Cost - Eligible Participants | Healthcare Benefits            
Defined Benefit Plan Disclosure [Line Items]            
Assumed annual and ultimate health care cost trend rate for next fiscal year   8.25%        
Forecast            
Defined Benefit Plan Disclosure [Line Items]            
Increase (decrease) in plan benefit obligations due to change in assumed rates $ 139          
Assumptions used, percentage change in weighted-average interest crediting rate that would impact pension and postretirement benefit obligations 0.50%          
Forecast | Pension Benefits            
Defined Benefit Plan Disclosure [Line Items]            
Long-term rate of return on plan assets 7.75%          
Employer voluntary contribution amount $ 350          
Forecast | Postretirement Benefits            
Defined Benefit Plan Disclosure [Line Items]            
Long-term rate of return on plan assets 4.00%          
Forecast | Prescription Drug Cost - Eligible Participants | Postretirement Benefits            
Defined Benefit Plan Disclosure [Line Items]            
Ultimate Health Care Cost Trend Rate           4.25%
Forecast | Prescription Drug Cost - Eligible Participants | Healthcare Benefits            
Defined Benefit Plan Disclosure [Line Items]            
Ultimate Health Care Cost Trend Rate         4.25%  
Forecast | Medical Cost - Eligible Participants | Postretirement Benefits            
Defined Benefit Plan Disclosure [Line Items]            
Ultimate Health Care Cost Trend Rate           4.25%
Forecast | Medical Cost - Eligible Participants | Healthcare Benefits            
Defined Benefit Plan Disclosure [Line Items]            
Ultimate Health Care Cost Trend Rate         4.25%