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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, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Proved Developed And Undeveloped Reserves [Roll Forward]        
Sales of reserves in place (in Bcf) (2)      
Natural Gas        
Proved Developed And Undeveloped Reserves [Roll Forward]        
Proved reserves, net, beginning balance 13,419 12,246 11,318  
Extensions and discoveries (in Bcf) 202 1,185 251  
Improved recovery (in Bcf) 152 603 192  
Purchases of reserves in place (in Bcf) 1,090 0 228  
Sales of reserves in place (in Bcf) (44) (6) 0  
Production (in Bcf) (769) (755) (693)  
Economic revisions due to prices (in Bcf) (3,860) 88 (575)  
Revisions of prior estimates (in Bcf) 987 58 1,526  
Proved reserves, net, ending balance 11,177 13,419 12,246  
Net proved developed reserves (in Bcf) 3,357 4,040 4,975 4,492
Natural Gas | North America        
Proved Developed And Undeveloped Reserves [Roll Forward]        
Proved reserves, net, beginning balance 13,393 12,217 11,285  
Extensions and discoveries (in Bcf) 202 1,185 251  
Improved recovery (in Bcf) 152 603 192  
Purchases of reserves in place (in Bcf) 1,090 0 228  
Sales of reserves in place (in Bcf) (44) (6) 0  
Production (in Bcf) (765) (750) (688)  
Economic revisions due to prices (in Bcf) (3,860) 87 (572)  
Revisions of prior estimates (in Bcf) 988 57 1,521  
Proved reserves, net, ending balance 11,155 13,393 12,217  
Net proved developed reserves (in Bcf) 3,347 4,029 4,956 4,469
Natural Gas | North Sea        
Proved Developed And Undeveloped Reserves [Roll Forward]        
Proved reserves, net, beginning balance 3 4 8  
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 (1) (3)  
Proved reserves, net, ending balance 3 3 4  
Net proved developed reserves (in Bcf) 3 1 1 3
Natural Gas | Offshore Africa        
Proved Developed And Undeveloped Reserves [Roll Forward]        
Proved reserves, net, beginning balance 23 25 25  
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) (3) (4) (4)  
Economic revisions due to prices (in Bcf) 0 1 (3)  
Revisions of prior estimates (in Bcf) (2) 1 7  
Proved reserves, net, ending balance 18 23 25  
Net proved developed reserves (in Bcf) 7 10 19 20