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Benefit Plans (Narrative) (Details)
$ in Millions
12 Months Ended
Dec. 31, 2024
USD ($)
extensionTerm
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Pension settlement transaction loss $ 371 $ 0 $ 0
Pension settlement transaction gain (loss), net of tax (293)    
Actuarial gain (loss) 24 (27)  
Defined benefit plan, plan with accumulated benefit obligation in excess of plan assets, accumulated benefit obligation 41 46  
Defined benefit plan, plan with accumulated benefit obligation in excess of plan assets, plan assets $ 0 $ 0  
Assumptions used in calculating assumed health care cost trend rate 4.00%    
Future capital call commitments for limited partnership investments $ 90    
Percentage of limited partnerships employing hedge fund strategies focused on fixed income and equity investments 14.00% 15.00%  
Defined contribution plan, maximum annual contributions per employee, percent 50.00%    
Defined contribution plan, employer matching contribution, percent of match 100.00%    
Defined contribution plan, employer matching contribution, percent of employees' gross pay 6.00%    
Company contribution of eligible compensation, depending on age, percent 5.00%    
Defined contribution plan, employers matching contribution, vesting period in years 5 years    
Benefit expense for the Company's savings plan $ 88 $ 82 $ 71
Pension Benefits      
Payment for pension settlement 1,044 80  
Pension settlement transaction loss (gain) (1,044) (86)  
Settlement through group annuity purchase   80  
Effect of pension settlement transactions   86  
Defined benefit plan, accumulated benefit obligation 681 1,807  
Actuarial gain (loss) $ 24 $ (27)  
Percentage of limited partnerships invested in private debt and equity 99.00% 94.00%  
Percentage of limited partnerships employing hedge fund strategies focused on fixed income and equity investments 1.00% 6.00%  
Defined benefit plan, expected future employer contributions, next fiscal year $ 5    
Pension Benefits | CANADA      
Pension settlement transaction loss 4    
Pension settlement transaction gain (loss), net of tax (3)    
Pension Benefits | UNITED STATES      
Payment for pension settlement 1,034    
Pension settlement transaction loss (gain) $ 1,045    
Number of employees covered by settlement | extensionTerm 7,600    
Percentage of benefit obligation transferred 60.00%    
Pension settlement transaction loss $ 367    
Pension settlement transaction gain (loss), net of tax (290)    
Postretirement Benefits      
Payment for pension settlement 0 $ 0  
Pension settlement transaction loss (gain) 0 0  
Actuarial gain (loss) $ 0 $ (4)  
Defined benefit plan, health care cost trend rate assumed for next fiscal year 4.00% 4.00% 4.00%
Defined benefit plan, expected future employer contributions, next fiscal year $ 1    
Minimum      
Defined benefit plan, plan assets, target allocation, percentage 0.00%    
Maximum      
Defined benefit plan, plan assets, target allocation, percentage 40.00%