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Employee Benefit Plans (Estimated Cash Flows) (Details) $ in Millions | Dec. 31, 2020 USD ($)
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Pension Plans | Qualified Plan |
Defined Benefit Plan Disclosure [Line Items] |
Estimated future benefit payments during 2021 | $ 292
Estimated future benefit payments during 2022 | 304
Estimated future benefit payments during 2023 | 317
Estimated future benefit payments during 2024 | 306
Estimated future benefit payments during 2025 | 303
Estimated future benefit payments during 2026-2030 | 1,476
Pension Plans | Nonqualified Plan |
Defined Benefit Plan Disclosure [Line Items] |
Estimated 2021 employer contributions | 25
Estimated future benefit payments during 2021 | 25
Estimated future benefit payments during 2022 | 22
Estimated future benefit payments during 2023 | 22
Estimated future benefit payments during 2024 | 21
Estimated future benefit payments during 2025 | 20
Estimated future benefit payments during 2026-2030 | 89
Postretirement Benefits |
Defined Benefit Plan Disclosure [Line Items] |
Estimated 2021 employer contributions | 24
Estimated future benefit payments during 2021 | 24
Estimated future benefit payments during 2022 | 23
Estimated future benefit payments during 2023 | 23
Estimated future benefit payments during 2024 | 23
Estimated future benefit payments during 2025 | 22
Estimated future benefit payments during 2026-2030 | $ 104

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