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Retirement and Employee Benefit Plans (Schedule of Expected Benefit Payments) (Details)
$ in Millions
Dec. 31, 2020
USD ($)
Pension Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2021 $ 5
2022 5
2023 5
2024 6
2025 5
Years 2026-2030 26
Other Postretirement Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2021 1
2022 1
2023 1
2024 1
2025 1
Years 2026-2030 $ 4