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Exploration And Evaluation Assets (Tables)
 12 Months Ended
Dec. 31, 2018
EXPLORATION AND EVALUATION ASSETS  
Exploration and Evaluation Assets rollforward

                                                                                                                                                                                                                                  

($ millions)

 
2018

 
2017

 

 

Beginning of year

 

2 052

 

2 038

 

 

Acquisitions and additions (Note 31)

 
316

 
53

 

 

Transfers to oil and gas assets

 
(31

)

—

 

 

Dry hole expenses

 
(11

)
(41

)

 

Disposals

 
(16

)

—

 

 

Amortization

 
(1

)
(1

)

 

Foreign exchange adjustments

 
10

 
3

 

 

End of year

 

2 319

 

2 052