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REVENUE (Tables)

12 Months Ended

Dec. 31, 2019

Revenue From Contracts With Customers [Abstract]

Disclosure of disaggregation of revenue from contracts with customers



	2019								2018
For the years ended December 31	Pipelines		Facilities		Marketing & New Ventures		Total		Pipelines		Facilities		Marketing & New Ventures		Total
($ millions)	Pipelines		Facilities		Marketing & New Ventures		Total		Pipelines		Facilities		Marketing & New Ventures		Total
Take-or-pay⁽¹⁾	1,200		625		—		1,825		979		582		—		1,561
Fee-for-service⁽¹⁾	387		117		—		504		424		103		—		527
Product sales⁽²⁾⁽³⁾	—		5		4,804		4,809		—		10		5,175		5,185
Revenue from contracts with customers	1,587		747		4,804		7,138		1,403		695		5,175		7,273
Lease and other revenue⁽⁴⁾	63		29		—		92		61		17		—		78
Total external revenue	1,650		776		4,804		7,230		1,464		712		5,175		7,351


⁽¹⁾	Revenue recognized over time.


⁽²⁾	Revenue recognized at a point in time.


⁽³⁾	Revenue reported for 2018 periods have been recast to reflect updated presentation for 2019, where product sales are reported in Marketing & New Ventures.


⁽⁴⁾	Includes fixed operating lease income of $92 million (2018: $78) for the 12 months ended December 31, 2019.

Disclosure of significant changes in contract assets and contract liabilities

Significant changes in the contract liabilities balances during the period are as follows:



	2019						2018
For the years ended December 31 ($ millions)	Take-or-Pay		Other Contract Liabilities		Total Contract Liabilities		Take-or-Pay		Other Contract Liabilities		Total Contract Liabilities
Opening balance	9		159		168		8		149		157
Additions (net in the period)	4		35		39		5		33		38
Acquisition (Note 6)	—		77		77		—		—		—
Revenue recognized from contract liabilities⁽¹⁾	(5	)	(48	)	(53	)	(4	)	(23	)	(27	)
Closing balance	8		223		231		9		159		168
Less current portion⁽²⁾	(8	)	(31	)	(39	)	(9	)	(28	)	(37	)
Ending balance	—		192		192		—		131		131


⁽¹⁾	Recognition of revenue related to performance obligations satisfied in the current period that were included in the opening balance of contract liabilities.


⁽²⁾	As at December 31, 2019, the balance includes $8 million of cash collected under take-or-pay contracts which will be recognized within one year as the customer chooses to ship, process, or otherwise forego the associated service.