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Leases
 12 Months Ended
Dec. 31, 2020
Disclosure of leases [Abstract]  
Leases Leases
LEASE ASSETS
Product transportation
and storage
Field equipment
and power
Offshore vessels
and equipment
Office leases
and other
Total
At January 1, 2019 (1)
$823 $332 $252 $132 $1,539 
Additions452 43 12 20 527 
Depreciation(106)(54)(72)(27)(259)
Derecognitions— (6)— — (6)
Foreign exchange adjustments and other(3)2 (10)(1)(12)
At December 31, 2019
$1,166 $317 $182 $124 $1,789 
Additions (2)
17 121 7 3 148 
Depreciation
(124)(53)(51)(26)(254)
Derecognitions
(20)

(5)

(10)

— (35)
Foreign exchange adjustments and other
(1)(1)— (1)(3)
At December 31, 2020$1,038 $379 $128 $100 $1,645 
(1) The Company adopted IFRS 16 "Leases" on January 1, 2019 using the modified retrospective approach.
(2) The acquisition of Painted Pony in 2020 included lease assets of $93 million (note 7).
LEASE ASSETS, BY SEGMENT
As at December 31, 2020 and 2019, the Company had the following lease assets by segment:
 
20202019
Exploration and Production
 
North America
$345 $300 
North Sea
7 38 
Offshore Africa
126 154 
Oil Sands Mining and Upgrading
1,080 1,191 
Head office
87 106 
 
$1,645 $1,789 
LEASE LIABILITIES
The Company measures its lease liabilities at the discounted value of its lease payments during the lease term. Lease liabilities at December 31, 2020 and 2019 were as follows:
 
20202019
Lease liabilities
$1,690 $1,809 
Less: current portion
189 233 
 
$1,501 $1,576 
In addition to the lease assets disclosed above, on an ongoing basis the Company enters into short-term leases related to its Exploration and Production and Oil Sands Mining and Upgrading activities.
Other amounts included in net earnings and cash flows during 2020 and 2019 are provided below:
20202019
Expenses relating to short-term leases (1)
$409 $448 
Interest expense on lease liabilities
$67 $70 
Variable lease payments not included in the measurement of lease liabilities
$85 $118 
Total cash outflows for leases (2)
$983 $1,178 
(1)During 2020, the Company capitalized $197 million (2019 - $305 million) of short-term leases as additions to property, plant and equipment.
(2)Comprised of cash outflows relating to lease liabilities, short-term leases, and variable lease payments.