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Retirement Benefits (Fair Value of Plan Assets) (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Other Postretirement Benefits      
Fair Value of Plan Assets [Line Items]      
Accumulated benefit obligation $ 127 $ 138 $ 148
Fair value of plan assets 295 277 259
Pension Benefits      
Fair Value of Plan Assets [Line Items]      
Accumulated benefit obligation   23 22
Fair value of plan assets 182 22  
Cash and Cash Equivalents [Member] | Other Postretirement Benefits      
Fair Value of Plan Assets [Line Items]      
Fair value of plan assets 8 13  
Cash and Cash Equivalents [Member] | Pension Benefits      
Fair Value of Plan Assets [Line Items]      
Fair value of plan assets 81 1  
Mutual Fund [Member] | Other Postretirement Benefits      
Fair Value of Plan Assets [Line Items]      
Fair value of plan assets 189 [1] 166 [2]  
Mutual Fund [Member] | Pension Benefits      
Fair Value of Plan Assets [Line Items]      
Fair value of plan assets 65 [3] 21 [4]  
Fixed Income Securities [Member] | Other Postretirement Benefits      
Fair Value of Plan Assets [Line Items]      
Fair value of plan assets 98 98  
Fixed Income Securities [Member] | Pension Benefits      
Fair Value of Plan Assets [Line Items]      
Fair value of plan assets 36    
Level 1 [Member] | Other Postretirement Benefits      
Fair Value of Plan Assets [Line Items]      
Fair value of plan assets 197 179  
Level 1 [Member] | Pension Benefits      
Fair Value of Plan Assets [Line Items]      
Fair value of plan assets 138 22  
Level 1 [Member] | Cash and Cash Equivalents [Member] | Other Postretirement Benefits      
Fair Value of Plan Assets [Line Items]      
Fair value of plan assets 8 13  
Level 1 [Member] | Cash and Cash Equivalents [Member] | Pension Benefits      
Fair Value of Plan Assets [Line Items]      
Fair value of plan assets 81 1  
Level 1 [Member] | Mutual Fund [Member] | Other Postretirement Benefits      
Fair Value of Plan Assets [Line Items]      
Fair value of plan assets 189 [1] 166 [2]  
Level 1 [Member] | Mutual Fund [Member] | Pension Benefits      
Fair Value of Plan Assets [Line Items]      
Fair value of plan assets 21 [3] 21 [4]  
Level 1 [Member] | Fixed Income Securities [Member] | Other Postretirement Benefits      
Fair Value of Plan Assets [Line Items]      
Fair value of plan assets 0 0  
Level 1 [Member] | Fixed Income Securities [Member] | Pension Benefits      
Fair Value of Plan Assets [Line Items]      
Fair value of plan assets 36    
Level 2 [Member] | Other Postretirement Benefits      
Fair Value of Plan Assets [Line Items]      
Fair value of plan assets 98 98  
Level 2 [Member] | Pension Benefits      
Fair Value of Plan Assets [Line Items]      
Fair value of plan assets 44 0  
Level 2 [Member] | Cash and Cash Equivalents [Member] | Other Postretirement Benefits      
Fair Value of Plan Assets [Line Items]      
Fair value of plan assets 0 0  
Level 2 [Member] | Cash and Cash Equivalents [Member] | Pension Benefits      
Fair Value of Plan Assets [Line Items]      
Fair value of plan assets 0 0  
Level 2 [Member] | Mutual Fund [Member] | Other Postretirement Benefits      
Fair Value of Plan Assets [Line Items]      
Fair value of plan assets 0 [1] 0 [2]  
Level 2 [Member] | Mutual Fund [Member] | Pension Benefits      
Fair Value of Plan Assets [Line Items]      
Fair value of plan assets 44 [3] 0 [4]  
Level 2 [Member] | Fixed Income Securities [Member] | Other Postretirement Benefits      
Fair Value of Plan Assets [Line Items]      
Fair value of plan assets 98 98  
Level 2 [Member] | Fixed Income Securities [Member] | Pension Benefits      
Fair Value of Plan Assets [Line Items]      
Fair value of plan assets 0    
Level 3 [Member] | Other Postretirement Benefits      
Fair Value of Plan Assets [Line Items]      
Fair value of plan assets 0 0  
Level 3 [Member] | Pension Benefits      
Fair Value of Plan Assets [Line Items]      
Fair value of plan assets 0 0  
Level 3 [Member] | Cash and Cash Equivalents [Member] | Other Postretirement Benefits      
Fair Value of Plan Assets [Line Items]      
Fair value of plan assets 0 0  
Level 3 [Member] | Cash and Cash Equivalents [Member] | Pension Benefits      
Fair Value of Plan Assets [Line Items]      
Fair value of plan assets 0 0  
Level 3 [Member] | Mutual Fund [Member] | Other Postretirement Benefits      
Fair Value of Plan Assets [Line Items]      
Fair value of plan assets 0 [1] 0 [2]  
Level 3 [Member] | Mutual Fund [Member] | Pension Benefits      
Fair Value of Plan Assets [Line Items]      
Fair value of plan assets 0 [3] 0 [4]  
Level 3 [Member] | Fixed Income Securities [Member] | Other Postretirement Benefits      
Fair Value of Plan Assets [Line Items]      
Fair value of plan assets 0 0  
Level 3 [Member] | Fixed Income Securities [Member] | Pension Benefits      
Fair Value of Plan Assets [Line Items]      
Fair value of plan assets 0    
Funded Plans [Member] | Pension Benefits      
Fair Value of Plan Assets [Line Items]      
Projected benefit obligation 22 23  
Accumulated benefit obligation 158 23  
Fair value of plan assets 182 22 20
Unfunded Plans [Member] | Pension Benefits      
Fair Value of Plan Assets [Line Items]      
Projected benefit obligation 16 15  
Accumulated benefit obligation 16 17 19
Fair value of plan assets $ 0 $ 0 $ 0
[1] Primarily composed of market index funds as of December 31, 2024.
[2] Primarily composed of market index funds as of December 31, 2023.
[3] Comprised of approximately 100% equities as of December 31, 2024.
[4] Comprised of approximately 100% equities as of December 31, 2023.