Supplementary Information (Tables)

12 Months Ended

Dec. 31, 2017

Supplementary Information [Abstract]

Net change in Non-Cash Working Capital

For the years ended December 31		2017		2016		2015
Operating Activities
Accounts receivable and accrued revenues	$	(21)	$	86	$	314
Accounts payable and accrued liabilities		(226)		(233)		(14)
Income tax receivable and payable		(6)		(40)		(38)
	$	(253)	$	(187)	$	262

Non-cash Activity

For the years ended December 31		2017		2016		2015
Non-Cash Investing Activities
Asset retirement obligation incurred (See Note 14)	$	11	$	18	$	19
Asset retirement obligation change in estimated future cash outflows (See Note 14)		88		(99)		115
Property, plant and equipment accruals		19		5		(346)
Capitalized long-term incentives (See Note 19)		55		40		(10)
Property additions/dispositions		194		100		12
Non-Cash Financing Activities
Common shares issued under dividend reinvestment plan (See Note 15)	$	1	$	1	$	73

Schedule of Cash Flow, Supplemental Disclosures [Table Text Block]

For the years ended December 31		2017		2016		2015
Interest Paid	$	370	$	397	$	602
Income Taxes Paid, net of Amounts (Recovered)	$	(77)	$	(19)	$	(105)