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Compensation Related Costs, Retirement Benefits - Change in Benefit Obligation (Details) - USD ($)
$ in Millions
8 Months Ended 12 Months Ended
Dec. 31, 2024
Dec. 31, 2024
Dec. 31, 2023
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined Benefit Plan, Plan Assets, Amount $ 160 $ 160  
Cash and Cash Equivalents      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 80 80  
Mutual Fund      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined Benefit Plan, Plan Assets, Amount [1] 44 44  
Fixed Income Securities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 36 36  
Fair Value, Inputs, Level 1      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 116 116  
Fair Value, Inputs, Level 1 | Cash and Cash Equivalents      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 80 80  
Fair Value, Inputs, Level 1 | Mutual Fund      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined Benefit Plan, Plan Assets, Amount [1] 0 0  
Fair Value, Inputs, Level 1 | Fixed Income Securities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 36 36  
Fair Value, Inputs, Level 2      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 44 44  
Fair Value, Inputs, Level 2 | Cash and Cash Equivalents      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
Fair Value, Inputs, Level 2 | Mutual Fund      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined Benefit Plan, Plan Assets, Amount [1] 44 44  
Fair Value, Inputs, Level 2 | Fixed Income Securities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
Fair Value, Inputs, Level 3      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
Fair Value, Inputs, Level 3 | Cash and Cash Equivalents      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
Fair Value, Inputs, Level 3 | Mutual Fund      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined Benefit Plan, Plan Assets, Amount [1] 0 0  
Fair Value, Inputs, Level 3 | Fixed Income Securities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
Pension Plan      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined Benefit Plan, Benefit Obligation 137 137 $ 0
Defined Benefit Plan, Benefit Obligation, Business Combination 152    
Defined Benefit Plan, Plan Assets, Amount 160 160 0
Defined Benefit Plan, Plan Assets, Business Combination 178    
Defined Benefit Plan, Funded (Unfunded) Status of Plan (23) (23)  
Assets for Plan Benefits, Defined Benefit Plan 24 24  
Liability, Defined Benefit Plan, Current (1) (1)  
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position 23 23  
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax   (9)  
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), before Tax   0  
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax   (9)  
Defined Benefit Plan, Service Cost 1    
Defined Benefit Plan, Interest Cost 5    
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment 0    
Defined Benefit Plan, Expected Return (Loss) on Plan Assets (8)    
Defined Benefit Plan, Benefit Obligation, Payment for Settlement 2    
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) 0    
Defined Benefit Plan, Benefit Obligation, Benefits Paid (36)    
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) 15    
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss)   12  
Defined Benefit Plan, Plan Assets, Contributions by Employer   5  
Defined Benefit Plan, Plan Assets, Benefits Paid   (35)  
Defined Benefit Plan, Expected Future Benefit Payment, Year One 71 71  
Defined Benefit Plan, Expected Future Benefit Payment, Year Two 3 3  
Defined Benefit Plan, Expected Future Benefit Payment, Year Three 3 3  
Defined Benefit Plan, Expected Future Benefit Payment, Year Four 3 3  
Defined Benefit Plan, Expected Future Benefit Payment, Year Five 4 4  
Defined Benefit Plan, Expected Future Benefit Payment, after Year Five for Next Five Years $ 19 $ 19  
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate 5.46% 5.46%  
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Weighted-Average Interest Crediting Rate 2.59% 2.59%  
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate   5.76%  
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-Term Rate of Return on Plan Assets   6.75%  
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Weighted-Average Interest Crediting Rate   4.26%  
Other Postretirement Benefits Plan      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined Benefit Plan, Benefit Obligation $ 1 $ 1 0
Defined Benefit Plan, Benefit Obligation, Business Combination 12    
Defined Benefit Plan, Plan Assets, Amount 0 0 0
Defined Benefit Plan, Plan Assets, Business Combination 0    
Defined Benefit Plan, Funded (Unfunded) Status of Plan 1 1  
Assets for Plan Benefits, Defined Benefit Plan 0 0  
Liability, Defined Benefit Plan, Current (1) (1)  
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position (1) (1)  
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax   0  
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), before Tax   11  
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax   11  
Defined Benefit Plan, Service Cost 0    
Defined Benefit Plan, Interest Cost 1    
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment (11)    
Defined Benefit Plan, Expected Return (Loss) on Plan Assets 0    
Defined Benefit Plan, Benefit Obligation, Payment for Settlement 0    
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) 1    
Defined Benefit Plan, Benefit Obligation, Benefits Paid 0    
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) (1)    
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss)     0
Defined Benefit Plan, Plan Assets, Contributions by Employer     0
Defined Benefit Plan, Plan Assets, Benefits Paid     $ 0
Defined Benefit Plan, Expected Future Benefit Payment, Year One 1 1  
Defined Benefit Plan, Expected Future Benefit Payment, Year Two 0 0  
Defined Benefit Plan, Expected Future Benefit Payment, Year Three 0 0  
Defined Benefit Plan, Expected Future Benefit Payment, Year Four 0 0  
Defined Benefit Plan, Expected Future Benefit Payment, Year Five 0 0  
Defined Benefit Plan, Expected Future Benefit Payment, after Year Five for Next Five Years $ 0 $ 0  
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate 5.64% 5.64%  
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate   5.74%  
[1]
(1)    Includes long-term and intermediate credit bonds.