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Employee Benefit Plans (Estimated Cash Flows) (Details)
$ in Millions
Dec. 31, 2021
USD ($)
Pension Plans | Qualified Plan  
Defined Benefit Plan Disclosure [Line Items]  
Estimated future benefit payments during 2022 $ 328
Estimated future benefit payments during 2023 339
Estimated future benefit payments during 2024 346
Estimated future benefit payments during 2025 351
Estimated future benefit payments during 2026 339
Estimated future benefit payments during 2027-2031 1,616
Pension Plans | Nonqualified Plan  
Defined Benefit Plan Disclosure [Line Items]  
Estimated 2022 employer contributions 25
Estimated future benefit payments during 2022 25
Estimated future benefit payments during 2023 25
Estimated future benefit payments during 2024 24
Estimated future benefit payments during 2025 24
Estimated future benefit payments during 2026 22
Estimated future benefit payments during 2027-2031 100
Postretirement Benefits  
Defined Benefit Plan Disclosure [Line Items]  
Estimated 2022 employer contributions 23
Estimated future benefit payments during 2022 23
Estimated future benefit payments during 2023 23
Estimated future benefit payments during 2024 24
Estimated future benefit payments during 2025 23
Estimated future benefit payments during 2026 23
Estimated future benefit payments during 2027-2031 $ 104