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Fair Value Measurements - Postretirement Health Care Plan (Details) - Postretirement Health Care Benefits Plan - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]      
Fair value plan assets $ 134 $ 186 $ 181
Recurring      
Defined Benefit Plan Disclosure [Line Items]      
Fair value plan assets 134 186  
Recurring | Total investment securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value plan assets 132 184  
Recurring | Equities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value plan assets 2 2  
Recurring | Commingled funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value plan assets 71 95  
Recurring | Government fixed income securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value plan assets 7 18  
Recurring | Corporate fixed income securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value plan assets 39 51  
Recurring | Short-term investment funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value plan assets 8 15  
Recurring | Private assets      
Defined Benefit Plan Disclosure [Line Items]      
Fair value plan assets 5 3  
Recurring | Accrued income receivable      
Defined Benefit Plan Disclosure [Line Items]      
Fair value plan assets 2    
Recurring | Cash      
Defined Benefit Plan Disclosure [Line Items]      
Fair value plan assets   2  
Level 1 | Recurring | Total investment securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value plan assets 59 89  
Level 1 | Recurring | Equities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value plan assets 2 2  
Level 1 | Recurring | Commingled funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value plan assets 49 72  
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 8 15  
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 68 92  
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 22 23  
Level 2 | Recurring | Government fixed income securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value plan assets 7 18  
Level 2 | Recurring | Corporate fixed income securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value plan assets 39 51  
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 5 3  
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 $ 5 $ 3