Accounts Receivable And Accrued Revenues (Tables)

12 Months Ended

Dec. 31, 2017

Accounts Receivable And Accrued Revenues [Abstract]

Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]

As at December 31		2017		2016
Trade Receivables and Accrued Revenues
Oil, NGLs and natural gas	$	425	$	394
Midstream and marketing		284		161
Derivative financial instruments		3		4
Corporate and other		9		81
Total Trade Receivables and Accrued Revenues		721		640
Prepaids		21		18
Deposits and Other		37		11
		779		669
Allowance for Doubtful Accounts		(5)		(6)
	$	774	$	663