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Retirement Plans (Narrative) (Details) - USD ($)
$ in Millions
4 Months Ended 8 Months Ended 12 Months Ended
Apr. 30, 2021
Dec. 31, 2021
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]            
Capitalization of pension and OPEB expense $ 7 $ 15   $ 21   $ 25
Pension [Member]            
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]            
Discount rate (in hundredths) 3.10% 2.90%   5.50% 2.90% 2.60%
Rate of return on plan assets (in hundredths) 7.50% 7.50%   7.50% 7.50% 7.50%
Benefit obligation       $ 200   $ 465
Settlement threshold       175   211
Pension settlement costs       55   159
Contributions to plans $ 32 $ 10   176 $ 42  
Actuarial gains (loss) 328 (30)   $ 867    
Actuarial gain change basis points       2.60%    
Pension [Member] | Scenario, Forecast [Member]            
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]            
Rate of return on plan assets (in hundredths)     7.50%      
Pension [Member] | Minimum [Member]            
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]            
Amortization period       7 years    
Pension [Member] | Maximum [Member]            
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]            
Amortization period       15 years    
401(K) Plan [Member]            
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]            
401(k) savings plan employer contributions $ 14 $ 25   $ 38   $ 39
OPEB [Member]            
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]            
Discount rate (in hundredths) 3.30% 3.00%   5.50% 3.00%  
Contributions to plans $ 18 $ 31   $ 46    
Increase (decrease) in accumulated benefit obligation for plan amendment         $ 79  
Prior service credits deferred in accumulated comprehensive income       40    
Actuarial gains (loss) $ 99 $ (37)   $ 248    
Annual rate of increase in the per-capita cost of covered medical benefits (in hundredths)       7.25%    
Annual rate of increase in the per-capita cost of covered medical benefits in 2029 (in hundredths)       5.00%    
OPEB [Member] | Minimum [Member]            
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]            
Discount rate (in hundredths)           2.60%
OPEB [Member] | Maximum [Member]            
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]            
Discount rate (in hundredths)           2.80%
Fixed Income Securities [Member]            
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]            
Target asset allocation       25.00%    
Equity Securities [Member]            
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]            
Target asset allocation       75.00%