The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3213-108585

Name:	us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

SUBSEQUENT EVENTS (Details) - CAD ($) $ in Millions		12 Months Ended
SUBSEQUENT EVENTS (Details) - CAD ($) $ in Millions	Jan. 15, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
SUBSEQUENT EVENTS
Payments to acquire property, plant, and equipment		$ 6,806	$ 8,287	$ 5,128
Subsequent Event
SUBSEQUENT EVENTS
Percentage of assets acquired	100.00%
Payments to acquire property, plant, and equipment	$ 265