EARNINGS PER COMMON SHARE - BASIC (Details) - shares shares in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Earnings Per Share [Abstract]
Prorata weighted average interest in entity's own common shares	13	13	13	13

Represents the entity's weighted average interest in its own common shares due to a reciprocal investment.

No definition available.

Name:	enb_WeightedAverageInterestInOwnCommonShares
Namespace Prefix:	enb_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration