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Benefit Plans (Estimated Future Minimum Benefit Payments to Participants) (Details)
$ in Millions
Dec. 31, 2023
USD ($)
Pension Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2024 $ 164
2025 163
2026 161
2027 158
2028 154
2029-2033 692
Postretirement Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2024 1
2025 1
2026 1
2027 0
2028 0
2029-2033 $ 1