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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, 2020
USD ($)
Pension Plan [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2021 $ 236 [1]
2022 228 [1]
2023 226 [1]
2024 222 [1]
2025 218 [1]
2026-2030 1,027 [1]
Other Postretirement Benefits Plan [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2021 4 [2]
2022 4 [2]
2023 4 [2]
2024 3 [2]
2025 3 [2]
2026-2030 $ 15 [2]
[1] Payments are expected to be made primarily from plan assets.
[2] Payments are expected to be made primarily from Company assets.