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Pension Plans and Other Postretirement Benefits - Defined Benefit Plans Expected Benefit (Details)
$ in Millions
Dec. 31, 2023
USD ($)
Pension Plan  
Defined Benefit Plan Disclosure [Line Items]  
2024 $ 393
2025 388
2026 384
2027 380
2028 378
2029-2033 1,746
Other Postretirement Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2024 12
2025 12
2026 12
2027 12
2028 12
2029-2033 $ 58