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Benefit Obligations (Schedule of Pension Benefits Expected to be Paid from the Plans or From the Company's Assets) (Details)
$ in Millions
Dec. 31, 2019
USD ($)
Pension Plan [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2020 $ 238 [1]
2021 228 [1]
2022 225 [1]
2023 223 [1]
2024 219 [1]
2025-2029 1,038 [1]
Other Postretirement Benefits Plan [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2020 5 [2]
2021 4 [2]
2022 4 [2]
2023 4 [2]
2024 4 [2]
2025-2029 $ 17 [2]
[1]
Payments are expected to be made primarily from plan assets.
[2]
Payments are expected to be made primarily from Company assets.