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Fair Value Measurements - Postretirement Health Care Plan (Details) - Postretirement Health Care Benefits Plan - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]      
Fair value plan assets $ 128 $ 134 $ 134
Recurring      
Defined Benefit Plan Disclosure [Line Items]      
Fair value plan assets 128 134  
Recurring | Total investment securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value plan assets 122 133  
Recurring | Equities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value plan assets 1 1  
Recurring | Commingled funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value plan assets 56 69  
Recurring | Government fixed income securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value plan assets 10 8  
Recurring | Corporate fixed income securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value plan assets 37 38  
Recurring | Short-term investment funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value plan assets 10 10  
Recurring | Private assets      
Defined Benefit Plan Disclosure [Line Items]      
Fair value plan assets 8 7  
Recurring | Accrued income receivable      
Defined Benefit Plan Disclosure [Line Items]      
Fair value plan assets 6 1  
Level 1 | Recurring | Total investment securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value plan assets 51 60  
Level 1 | Recurring | Equities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value plan assets 1 1  
Level 1 | Recurring | Commingled funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value plan assets 40 49  
Level 1 | Recurring | Government fixed income securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value plan assets 0 0  
Level 1 | Recurring | Corporate fixed income securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value plan assets 0 0  
Level 1 | Recurring | Short-term investment funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value plan assets 10 10  
Level 1 | Recurring | Private assets      
Defined Benefit Plan Disclosure [Line Items]      
Fair value plan assets 0 0  
Level 2 | Recurring | Total investment securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value plan assets 63 66  
Level 2 | Recurring | Equities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value plan assets 0 0  
Level 2 | Recurring | Commingled funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value plan assets 16 20  
Level 2 | Recurring | Government fixed income securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value plan assets 10 8  
Level 2 | Recurring | Corporate fixed income securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value plan assets 37 38  
Level 2 | Recurring | Short-term investment funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value plan assets 0 0  
Level 2 | Recurring | Private assets      
Defined Benefit Plan Disclosure [Line Items]      
Fair value plan assets 0 0  
Level 3 | Recurring | Total investment securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value plan assets 8 7  
Level 3 | Recurring | Equities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value plan assets 0 0  
Level 3 | Recurring | Commingled funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value plan assets 0 0  
Level 3 | Recurring | Government fixed income securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value plan assets 0 0  
Level 3 | Recurring | Corporate fixed income securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value plan assets 0 0  
Level 3 | Recurring | Short-term investment funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value plan assets 0 0  
Level 3 | Recurring | Private assets      
Defined Benefit Plan Disclosure [Line Items]      
Fair value plan assets $ 8 $ 7