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Retirement Benefits and Trusteed Assets (Pension Plan - Benefits related to Qualified and Nonqualified Pension Plans Expected to be paid in the Next Ten Years) (Details) - Pension plan
$ in Millions
Dec. 31, 2019
USD ($)
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]  
2020 $ 311
2021 319
2022 324
2023 330
2024 334
2025-2029 1,723
Total $ 3,341