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EXPLORATION AND EVALUATION ASSETS (Tables)
 12 Months Ended
Dec. 31, 2020
EXPLORATION AND EVALUATION ASSETS  
Exploration and Evaluation Assets rollforward

 

                                                                                                                                                                                    

($ millions)

 

December 31
2020

 

December 31
2019

 

 

Beginning of year

 

2 428

 

2 319

 

 

Acquisitions and additions

 
176

 
193

 

 

Transfers to oil and gas assets

 
(170

)

—

 

 

Dry hole expenses

 
(80

)
(66

)

 

Disposals and derecognition

 
(70

)
(16

)

 

Foreign exchange adjustments

 
2

 
(2

)

 

End of year

 

2 286

 

2 428