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SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION (Tables)
 12 Months Ended
Dec. 31, 2017
Statement Of Cash Flows, Additional Disclosures [Abstract]  
Schedule Of Cash Flow Supplemental Disclosures
 
 
2017

 
2016

 
2015

Changes in non-cash working capital
 
 

 
 

 
 
Accounts receivable
 
$
(977
)
 
$
(142
)
 
$
615

Current income tax assets
 
527

 
(165
)
 
(447
)
Inventory
 
81

 
(79
)
 
142

Prepaids and other
 
(28
)
 
14

 
11

Accounts payable
 
175

 
31

 
7

Accrued liabilities
 
365

 
(116
)
 
(981
)
Other long-term liabilities (1)
 
469

 
—

 
—

Net changes in non-cash working capital
 
$
612

 
$
(457
)
 
$
(653
)
Relating to:
 
 

 
 

 
 

Operating activities
 
$
299

 
$
(542
)
 
$
239

Financing activities
 
—

 
—

 
(40
)
Investing activities
 
313

 
85

 
(852
)
 
 
$
612

 
$
(457
)
 
$
(653
)
 
 
2017

 
2016

 
2015

Expenditures on exploration and evaluation assets
 
$
159

 
$
29

 
$
180

Net proceeds on sale of exploration and evaluation assets (2)
 
(35
)
 
(35
)
 
(416
)
Net expenditures (proceeds) on exploration and evaluation assets
 
$
124

 
$
(6
)
 
$
(236
)
 
 
 
 
 
 
 
Expenditures on property, plant and equipment
 
$
4,574

 
$
4,152

 
$
5,118

Net proceeds on sale of property, plant and equipment (2) (3)
 
—

 
(349
)
 
(414
)
Net expenditures on property, plant and equipment
 
$
4,574

 
$
3,803

 
$
4,704

(1)
Included in other long-term liabilities at December 31, 2017 is $469 million (US$375 million) of deferred purchase consideration payable to Marathon in March 2018.
(2)
Net proceeds on exploration and evaluation assets and net expenditures on property, plant and equipment in 2015 exclude non-cash share consideration of $985 million received from PrairieSky on the disposition of royalty income assets.
(3)
Net expenditures on property, plant and equipment in 2016 exclude non-cash share consideration of $190 million received from Inter Pipeline on the disposition of the Company's interest in the Cold Lake Pipeline.
Reconciliation of liabilities arising from financing activities
The following table summarizes movements in the Company's liabilities arising from financing activities for the year ended December 31, 2017:
 
 
Long-term debt

 
Cash flow hedges on US dollar debt securities

 
Liabilities from financing activities

At December 31, 2016
 
$
16,805

 
$
(485
)
 
$
16,320

Changes from financing cash flows:
 
 
 
 
 
 
Issue of long-term debt, net (1)
 
6,622

 
—

 
6,622

Settlement of hedge instruments, net
 
—

 
124

 
124

Changes in foreign exchange and fair value (2)
 
(969
)
 
222

 
(747
)
At December 31, 2017
 
$
22,458

 
$
(139
)
 
$
22,319

(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 and the amortization of original issue discounts and premiums and directly attributable transaction costs.