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Commitments And Contingencies (Schedule Of Commitments And Contingencies) (Details)
$ in Millions
Dec. 31, 2021
USD ($)
Drilling And Facility Obligations [Member]  
Long Term Purchase Commitment [Line Items]  
2022 $ 182
2023 27
2024 19
2025 12
2026 12
Thereafter 27
Total 279
Operational Agreements [Member]  
Long Term Purchase Commitment [Line Items]  
2022 474
2023 418
2024 395
2025 327
2026 279
Thereafter 678
Total 2,571
Office and Equipment Leases and Other [Member]  
Long Term Purchase Commitment [Line Items]  
2022 51
2023 46
2024 28
2025 25
2026 22
Thereafter 363
Total $ 535