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Pension Plans and Other Postretirement Benefit Plans - Schedule of Fair Value Hierarchy of pension Plan's Assets (Details) - Pension Plan and SERP [Member] - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 608 [1] $ 590 [1] $ 541
Cash Equivalents [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 8 7  
Fixed Income Securities [Member] | US Government Debt Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 37 19  
Fixed Income Securities [Member] | Domestic Corporate Debt Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 213 175  
Fixed Income Securities [Member] | Debt Security, Government, Non-US [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 33 27  
Fixed Income Securities [Member] | Municipal Bonds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 11 14  
Mutual Funds [Member] | U.S Equity Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 160 170  
Mutual Funds [Member] | International Equity Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 63 75  
Common/Collective Trusts [Member] | Real Estate [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 24 25  
Partnership And Closely Held Investments [Member] | International Equity Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 52 71  
Partnership And Closely Held Investments [Member] | Real Estate [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 7 7  
Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 223 245  
Level 1 [Member] | Mutual Funds [Member] | U.S Equity Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 160 170  
Level 1 [Member] | Mutual Funds [Member] | International Equity Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 63 75  
Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 302 242  
Level 2 [Member] | Cash Equivalents [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 8 7  
Level 2 [Member] | Fixed Income Securities [Member] | US Government Debt Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 37 19  
Level 2 [Member] | Fixed Income Securities [Member] | Domestic Corporate Debt Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 213 175  
Level 2 [Member] | Fixed Income Securities [Member] | Debt Security, Government, Non-US [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 33 27  
Level 2 [Member] | Fixed Income Securities [Member] | Municipal Bonds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 11 $ 14  
[1] As of December 31, 2024, the SERP had a projected benefit obligation of $27 million and an accumulated benefit obligation of $26 million, with no plan assets.