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Supplemental Disclosure of Cash Flow Information (Tables)
 12 Months Ended
Dec. 31, 2019
Statement Of Cash Flows, Additional Disclosures [Abstract]  
Schedule Of Cash Flow Supplemental Disclosures
 
 
2019


2018


2017

Changes in non-cash working capital
 
 


 


 
Accounts receivable
 
$
(1,310
)

$
1,233


$
(977
)
Current income tax (liabilities) assets
 
(164
)

471


527

Inventory
 
(194
)

(74
)

81

Prepaids and other
 
2


(3
)

(28
)
Other long-term assets
 
117

 
—

 
—

Accounts payable
 
39


(7
)

175

Accrued liabilities
 
265


(268
)

365

Other long-term liabilities (1) (2)
 
(23
)

(351
)

469

Net changes in non-cash working capital
 
$
(1,268
)
 
$
1,001

 
$
612

Relating to:
 
 

 
 

 
 

Operating activities
 
$
(1,033
)

$
1,346


$
299

Investing activities
 
(235
)

(345
)

313

 
 
$
(1,268
)
 
$
1,001

 
$
612

 
 
2019


2018


2017

Expenditures on exploration and evaluation assets
 
$
73


$
282


$
159

Net proceeds on sale of exploration and evaluation assets
 
—


(16
)

(35
)
Net expenditures on exploration and evaluation assets
 
$
73

 
$
266

 
$
124

(1)
Included in other long-term liabilities at December 31, 2019 is $95 million of deferred purchase consideration payable over the next four years (December 31, 2018 – $118 million).
(2)
Included in other long-term liabilities at December 31, 2017 is $469 million (US$375 million) of deferred purchase consideration paid to Marathon.
Reconciliation of liabilities arising from financing activities
The following table summarizes movements in the Company's liabilities arising from financing activities for the years' ended December 31, 2019 and 2018:
 
 
Long-term debt

 
Cash flow hedges on
US dollar debt securities

 
Lease liabilities

 
Liabilities from financing activities

At December 31, 2017
 
$
22,458

 
$
(139
)
 
$
—

 
$
22,319

Changes from financing cash flows:
 
 
 
 
 
 
 
 
Repayment of long-term debt, net (1)
 
(2,831
)
 
—

 
—

 
(2,831
)
Changes in foreign exchange and fair value (2)
 
996

 
(222
)
 
—

 
774

At December 31, 2018
 
20,623

 
(361
)
 
—

 
20,262

Adoption of IFRS 16 (3)
 
—

 
—

 
1,539

 
1,539

At January 1, 2019
 
20,623

 
(361
)
 
1,539

 
21,801

Changes from financing cash flows:
 
 
 
 
 
 
 
 
Issue of long-term debt, net (1)
 
1,025

 
—

 
—

 
1,025

Payment of lease liabilities
 
—

 
—

 
(237
)
 
(237
)
Non-cash changes:
 
 
 
 
 
 
 
 
Lease additions
 
—

 
—

 
527

 
527

Changes in foreign exchange and fair value (2)
 
(666
)
 
162

 
(20
)
 
(524
)
At December 31, 2019
 
$
20,982

 
$
(199
)
 
$
1,809

 
$
22,592

(1)
Includes original issue discounts and premiums, and directly attributable transaction costs.
(2)
Includes foreign exchange (gain) loss, changes in the fair value of cash flow hedges on US dollar debt, the amortization of original issue discounts and premiums and directly attributable transaction costs, and derecognitions of lease liabilities.
(3)
The Company adopted IFRS 16 "Leases" on January 1, 2019 using the modified retrospective approach (see note 2).