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Benefit Plans (Estimated Future Benefit Payments) (Details)
$ in Millions
Dec. 31, 2023
USD ($)
Pension [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2024 $ 494
2025 478
2026 478
2027 479
2028 481
2029-2033 2,362
Postretirement Benefit Plan [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2024 96
2025 91
2026 90
2027 90
2028 92
2029-2033 $ 461