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Employee Benefit Plans (Estimated Cash Flows) (Details)
$ in Millions
Dec. 31, 2023
USD ($)
Pension Plans | Qualified Plan  
Defined Benefit Plan Disclosure [Line Items]  
Estimated future benefit payments during 2024 $ 358
Estimated future benefit payments during 2025 332
Estimated future benefit payments during 2026 353
Estimated future benefit payments during 2027 345
Estimated future benefit payments during 2028 335
Estimated future benefit payments during 2029-2033 1,636
Pension Plans | Nonqualified Plan  
Defined Benefit Plan Disclosure [Line Items]  
Estimated 2024 employer contributions 24
Estimated future benefit payments during 2024 24
Estimated future benefit payments during 2025 24
Estimated future benefit payments during 2026 24
Estimated future benefit payments during 2027 24
Estimated future benefit payments during 2028 22
Estimated future benefit payments during 2029-2033 93
Postretirement Benefits  
Defined Benefit Plan Disclosure [Line Items]  
Estimated 2024 employer contributions 23
Estimated future benefit payments during 2024 23
Estimated future benefit payments during 2025 23
Estimated future benefit payments during 2026 23
Estimated future benefit payments during 2027 23
Estimated future benefit payments during 2028 22
Estimated future benefit payments during 2029-2033 $ 104