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Pension and Other Postretirement Benefit Plans - Fair Values of Other Postretirement Benefit Plan Assets (Details) - Other Postretirement Benefits - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value $ 1,045 $ 947 $ 1,292
Cash and cash equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 13 10  
Developed markets equities      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 301 279  
Emerging markets equities      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 80 74  
Real estate      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 12 14  
Developed markets      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 223 206  
Government and agency obligations      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 245 226  
Corporate obligations      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 157 137  
Mortgage and asset-backed securities      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 2 2  
Derivatives      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 12 (1)  
Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 259 228  
Level 1 | Cash and cash equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 0 1  
Level 1 | Developed markets equities      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 24 22  
Level 1 | Emerging markets equities      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 0 0  
Level 1 | Real estate      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 0 0  
Level 1 | Developed markets      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 223 206  
Level 1 | Government and agency obligations      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 0 0  
Level 1 | Corporate obligations      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 0 0  
Level 1 | Mortgage and asset-backed securities      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 0 0  
Level 1 | Derivatives      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 12 (1)  
Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 404 365  
Level 2 | Cash and cash equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 0 0  
Level 2 | Developed markets equities      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 0 0  
Level 2 | Emerging markets equities      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 0 0  
Level 2 | Real estate      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 0 0  
Level 2 | Developed markets      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 0 0  
Level 2 | Government and agency obligations      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 245 226  
Level 2 | Corporate obligations      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 157 137  
Level 2 | Mortgage and asset-backed securities      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 2 2  
Level 2 | Derivatives      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 0 0  
Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 0 0  
Level 3 | Cash and cash equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 0 0  
Level 3 | Developed markets equities      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 0 0  
Level 3 | Emerging markets equities      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 0 0  
Level 3 | Real estate      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 0 0  
Level 3 | Developed markets      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 0 0  
Level 3 | Government and agency obligations      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 0 0  
Level 3 | Corporate obligations      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 0 0  
Level 3 | Mortgage and asset-backed securities      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 0 0  
Level 3 | Derivatives      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 0 0  
NAV      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 382 354  
NAV | Cash and cash equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 13 9  
NAV | Developed markets equities      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 277 257  
NAV | Emerging markets equities      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 80 74  
NAV | Real estate      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 12 14  
NAV | Developed markets      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 0 0  
NAV | Government and agency obligations      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 0 0  
NAV | Corporate obligations      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 0 0  
NAV | Mortgage and asset-backed securities      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 0 0  
NAV | Derivatives      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value $ 0 $ 0