XML 113 R90.htm IDEA: XBRL DOCUMENT v3.25.0.1
Retirement Plans (Narrative) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2024
Sep. 30, 2024
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]            
Capitalization of pension and OPEB expense       $ 18 $ 18 $ 21
Pension remeasurement (loss) gain       (45) 202 218
OPEB remeasurement gain       $ 35 $ (3) $ 248
Pension [Member]            
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]            
Discount rate (in hundredths) 5.60%     5.60% 5.20% 5.50%
Rate of return on plan assets (in hundredths) 6.65% 7.50%     7.50% 7.50%
Benefit obligation       $ 0    
Settlement threshold       173 $ 180 $ 175
Pension settlement costs           $ 55
Contributions to plans       133 $ 134  
Remeasurement (gains) loss       $ 45    
Percentage of decrease in pension plan           20.00%
Percentage of increase in pension plan       5.00% 15.00%  
Lump sum pension payments       $ 108 $ 129  
Funded Percentage 96.00%     96.00%    
Plan assets $ 2,328     $ 2,328 2,268 $ 2,033
Accumulated benefit obligation           200
Actuarial gains (loss)       5 $ 44 $ 867
Actuarial gain change basis points         0.30% 260.00%
Benefit payments       187 $ 204  
Special termination benefits enhancements       38 44  
Special/contractual termination benefits       $ 12    
Pension [Member] | Minimum [Member]            
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]            
Rate of return on plan assets (in hundredths)       6.65%    
Pension [Member] | Maximum [Member]            
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]            
Rate of return on plan assets (in hundredths)       7.50%    
401(K) Plan [Member]            
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]            
401(k) savings plan employer contributions       $ 38 $ 37 $ 38
OPEB [Member]            
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]            
Discount rate (in hundredths) 5.70%     5.70% 5.20% 5.50%
Contributions to plans       $ 38 $ 42  
Remeasurement (gains) loss       35    
Plan assets        
Prior service credits deferred in accumulated comprehensive income         45 40
Actuarial gains (loss)       $ 35 (3) $ 248
Annual rate of increase in the per-capita cost of covered medical benefits (in hundredths) 6.75%     6.75%    
Annual rate of increase in the per-capita cost of covered medical benefits in 2032 (in hundredths) 4.75%     4.75%    
Benefit payments       $ 48 $ 53  
OPEB [Member] | Minimum [Member]            
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]            
Discount rate (in hundredths)           5.50%
Fixed Income Securities [Member]            
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]            
Target asset allocation 65.00%     65.00%    
Equity Securities [Member]            
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]            
Target asset allocation 35.00%     35.00%    
Scenario, Forecast [Member] | Pension [Member]            
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]            
Rate of return on plan assets (in hundredths)     6.65%