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Benefit Plans (Estimated Future Benefit Payments) (Details)
$ in Millions
Dec. 31, 2019
USD ($)
Pension [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2020 $ 472
2021 477
2022 479
2023 483
2024 481
2025-2029 2,430
Postretirement Benefit Plan [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2020 126
2021 124
2022 121
2023 117
2024 115
2025-2029 $ 555