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Commitments And Contingencies (Schedule Of Commitments And Contingencies) (Details)
$ in Millions
Dec. 31, 2020
USD ($)
Drilling And Facility Obligations [Member]  
Long Term Purchase Commitment [Line Items]  
2021 $ 84
2022 38
2023 36
2024 26
2025 7
Total 191
Operational Agreements [Member]  
Long Term Purchase Commitment [Line Items]  
2021 241
2022 251
2023 212
2024 197
2025 162
Thereafter 483
Total 1,546
Office And Equipment Leases [Member]  
Long Term Purchase Commitment [Line Items]  
2021 54
2022 29
2023 28
2024 10
2025 9
Thereafter 289
Total $ 419