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EARNINGS PER COMMON SHARE - BASIC (Details) - shares shares in Millions | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Earnings Per Share [Abstract] |  |
Prorata weighted average interest in entity's own common shares | 13 | 13

X
- Definition Represents the entity's weighted average interest in its own common shares due to a reciprocal investment. + References No definition available. + Details
Name: | enb_WeightedAverageInterestInOwnCommonShares
Namespace Prefix: | enb_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_EarningsPerShareAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration