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Employee Benefit Plans (Estimated Cash Flows) (Details)
$ in Millions
Dec. 31, 2019
USD ($)
Qualified Pension  
Defined Benefit Plan Disclosure [Line Items]  
Estimated future benefit payments during 2020 $ 300
Estimated future benefit payments during 2021 315
Estimated future benefit payments during 2022 329
Estimated future benefit payments during 2023 327
Estimated future benefit payments during 2024 316
Estimated future benefit payments during 2025-2029 1,557
Nonqualified Pension  
Defined Benefit Plan Disclosure [Line Items]  
Estimated 2020 employer contributions 26
Estimated future benefit payments during 2020 26
Estimated future benefit payments during 2021 26
Estimated future benefit payments during 2022 23
Estimated future benefit payments during 2023 23
Estimated future benefit payments during 2024 21
Estimated future benefit payments during 2025-2029 92
Postretirement Benefits  
Defined Benefit Plan Disclosure [Line Items]  
Estimated 2020 employer contributions 28
Estimated future benefit payments during 2020 28
Estimated future benefit payments during 2021 27
Estimated future benefit payments during 2022 26
Estimated future benefit payments during 2023 25
Estimated future benefit payments during 2024 25
Estimated future benefit payments during 2025-2029 $ 111