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Employee Benefit Plans (Estimated Cash Flows) (Details)
$ in Millions
Dec. 31, 2024
USD ($)
Pension Plans | Qualified Plan  
Estimated future benefit payments  
2025 $ 335
2026 345
2027 347
2028 350
2029 347
2030-2034 1,709
Pension Plans | Nonqualified Plan  
Defined Benefit Plan Disclosure [Line Items]  
Estimated 2025 employer contributions 24
Estimated future benefit payments  
2025 24
2026 24
2027 24
2028 23
2029 22
2030-2034 89
Postretirement Benefits  
Defined Benefit Plan Disclosure [Line Items]  
Estimated 2025 employer contributions 22
Estimated future benefit payments  
2025 22
2026 22
2027 22
2028 21
2029 21
2030-2034 $ 100