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Right of Use Assets (Tables)
12 Months Ended
Dec. 31, 2019
Disclosure of leases [Abstract]  
Disclosure of quantitative information about right-of-use assets [text block]
A reconciliation of the changes in the carrying amount of the right of use assets is as follows:

LandBuildingsVehiclesEquipmentPipelineTotal
New leases recognized Jan. 1, 201929  22   —  —  52  
Adjustments on recognition(1)
(1) (4) —  —  —  (5) 
Transfers from PP&E, intangibles and other assets—  —   35  —  38  
As at Jan. 1, 201928  18   35  —  85  
Additions32   —   45  81  
Depreciation(1) (4) (2) (11) —  (18) 
Change in foreign exchange rates(1) —  —  —  —  (1) 
Transfers—  —  —  (1) —  (1) 
As at Dec. 31, 201958  16   25  45  146  
(1) Adjusted by the amount of any prepaid or accrued lease payments, onerous contract provisions and lease inducements.