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Supplementary Oil And Gas Information (Unaudited) - Proved and Proved Developed Natural Gas Reserve Quantities (Details) - Natural Gas - Bcf
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Proved Developed And Undeveloped Reserves [Roll Forward]        
Proved reserves, net, beginning balance 11,318 7,701 4,782  
Extensions and discoveries (in Bcf) 251 545 173  
Improved recovery (in Bcf) 192 161 159  
Purchases of reserves in place (in Bcf) 228 1,654 2,615  
Sales of reserves in place (in Bcf) 0 (1) (4)  
Production (in Bcf) (693) (587) (524)  
Economic revisions due to prices (in Bcf) (575) 708 100  
Revisions of prior estimates (in Bcf) 1,526 1,136 399  
Proved reserves, net, ending balance 12,246 11,318 7,701  
Net proved developed reserves (in Bcf) 4,975 4,492 3,144 2,381
North America        
Proved Developed And Undeveloped Reserves [Roll Forward]        
Proved reserves, net, beginning balance 11,285 7,655 4,728  
Extensions and discoveries (in Bcf) 251 545 173  
Improved recovery (in Bcf) 192 161 159  
Purchases of reserves in place (in Bcf) 228 1,654 2,614  
Sales of reserves in place (in Bcf) 0 (1) (4)  
Production (in Bcf) (688) (581) (515)  
Economic revisions due to prices (in Bcf) (572) 712 97  
Revisions of prior estimates (in Bcf) 1,521 1,139 402  
Proved reserves, net, ending balance 12,217 11,285 7,655  
Net proved developed reserves (in Bcf) 4,956 4,469 3,116 2,342
North Sea        
Proved Developed And Undeveloped Reserves [Roll Forward]        
Proved reserves, net, beginning balance 8 12 16  
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) (4)  
Economic revisions due to prices (in Bcf) 0 0 0  
Revisions of prior estimates (in Bcf) (3) (3) 0  
Proved reserves, net, ending balance 4 8 12  
Net proved developed reserves (in Bcf) 1 3 6 11
Offshore Africa        
Proved Developed And Undeveloped Reserves [Roll Forward]        
Proved reserves, net, beginning balance 25 34 38  
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) (5)  
Economic revisions due to prices (in Bcf) (3) (4) 4  
Revisions of prior estimates (in Bcf) 7 0 (3)  
Proved reserves, net, ending balance 25 25 34  
Net proved developed reserves (in Bcf) 19 20 22 28