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Exploration and Evaluation Assets
 12 Months Ended
Dec. 31, 2022
Exploration For And Evaluation Of Mineral Resources [Abstract]  
Exploration and Evaluation Assets Exploration and Evaluation Assets
 
Exploration and Production
Oil Sands
 Mining and
Upgrading
Total
 
North America
North Sea
Offshore Africa
 
 
Cost
 
 
 
 
 
At December 31, 2020$2,101 $— $83 $252 $2,436 
Additions/Acquisitions (note 7)
30 — 8 — 38 
Transfers to property, plant and equipment
(73)— — (150)(223)
Derecognitions and other
(1)— — — (1)
At December 31, 20212,057 — 91 102 2,250 
Additions/Acquisitions
41 — 5 — 46 
Transfers to property, plant and equipment
(71)— — — (71)
Derecognitions and other(1)— — — (1)
Foreign exchange adjustments
— — 2 — 2 
At December 31, 2022$2,026 $— $98 $102 $2,226