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Supplementary Oil And Gas Information (Unaudited) - Proved and Proved Developed Natural Gas Reserve Quantities (Details) - MMBbls
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Proved Developed And Undeveloped Reserves [Roll Forward]        
Sales of reserves in place (in Bcf) (1)      
Natural Gas        
Proved Developed And Undeveloped Reserves [Roll Forward]        
Proved reserves, net, beginning balance 12,246 11,318 7,701  
Extensions and discoveries (in Bcf) 1,185 251 545  
Improved recovery (in Bcf) 603 192 161  
Purchases of reserves in place (in Bcf) 0 228 1,654  
Sales of reserves in place (in Bcf) (6) 0 (1)  
Production (in Bcf) (755) (693) (587)  
Economic revisions due to prices (in Bcf) 88 (575) 708  
Revisions of prior estimates (in Bcf) 58 1,526 1,136  
Proved reserves, net, ending balance 13,419 12,246 11,318  
Net proved developed reserves (in Bcf) 4,040 4,975 4,492 3,144
Natural Gas | North America        
Proved Developed And Undeveloped Reserves [Roll Forward]        
Proved reserves, net, beginning balance 12,217 11,285 7,655  
Extensions and discoveries (in Bcf) 1,185 251 545  
Improved recovery (in Bcf) 603 192 161  
Purchases of reserves in place (in Bcf) 0 228 1,654  
Sales of reserves in place (in Bcf) (6) 0 (1)  
Production (in Bcf) (750) (688) (581)  
Economic revisions due to prices (in Bcf) 87 (572) 712  
Revisions of prior estimates (in Bcf) 57 1,521 1,139  
Proved reserves, net, ending balance 13,393 12,217 11,285  
Net proved developed reserves (in Bcf) 4,029 4,956 4,469 3,116
Natural Gas | North Sea        
Proved Developed And Undeveloped Reserves [Roll Forward]        
Proved reserves, net, beginning balance 4 8 12  
Extensions and discoveries (in Bcf) 0 0 0  
Improved recovery (in Bcf) 0 0 0  
Purchases of reserves in place (in Bcf) 0 0 0  
Sales of reserves in place (in Bcf) 0 0 0  
Production (in Bcf) (1) (1) (1)  
Economic revisions due to prices (in Bcf) 0 0 0  
Revisions of prior estimates (in Bcf) (1) (3) (3)  
Proved reserves, net, ending balance 3 4 8  
Net proved developed reserves (in Bcf) 1 1 3 6
Natural Gas | Offshore Africa        
Proved Developed And Undeveloped Reserves [Roll Forward]        
Proved reserves, net, beginning balance 25 25 34  
Extensions and discoveries (in Bcf) 0 0 0  
Improved recovery (in Bcf) 0 0 0  
Purchases of reserves in place (in Bcf) 0 0 0  
Sales of reserves in place (in Bcf) 0 0 0  
Production (in Bcf) (4) (4) (4)  
Economic revisions due to prices (in Bcf) 1 (3) (4)  
Revisions of prior estimates (in Bcf) 1 7 0  
Proved reserves, net, ending balance 23 25 25  
Net proved developed reserves (in Bcf) 10 19 20 22