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RELATED PARTY TRANSACTIONS (Tables) | 12 Months Ended
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Dec. 31, 2020
Related Party Transactions [Abstract] |
RELATED PARTY TRANSACTIONS | Our transactions with significantly influenced investees are as follows:
Year ended December 31, 2020 |  | Transportation and Other Services | Operating and Administrative | Commodity Sales | Commodity Costs | Gas Distribution costs
(millions of Canadian dollars) |  |  |  |  |  |
Alliance Pipeline Limited |  | — |  | — |  | — |  | 81 |  | — |
Aux Sable Midstream LLC |  | — |  | — |  | — |  | 2 |  | — |
Aux Sable Canada LP |  | — |  | — |  | — |  | 91 |  | — |
Seaway Crude Pipeline System |  | — |  | 342 |  | — |  | 256 |  | — |
Alliance Canada Marketing L.P. |  | — |  | — |  | 64 |  | 17 |  | — |
NEXUS Gas Transmission, LLC |  | 69 |  | 21 |  | — |  | — |  | 116 |
Vector Pipeline L.P. |  | — |  | 7 |  | — |  | — |  | 19 |
Énergir, L.P. |  | 37 |  | — |  | — |  | — |  | — |
DCP Midstream, LLC |  | 3 |  | — |  | 24 |  | — |  | — |
Gulfstream Management and Operating Services, LLC |  | — |  | 4 |  | — |  | — |  | — |
Sabal Trail Transmission, LLC |  | — |  | 25 |  | — |  | — |  | — |
Steckman Ridge |  | — |  | 4 |  | — |  | — |  | — |
Noverco |  | — |  | — |  | 3 |  | — |  | — |
Year ended December 31, 2019 |  | Transportation and Other Services | Operating and Administrative | Commodity Sales | Commodity Costs | Gas Distribution costs
(millions of Canadian dollars) |  |  |  |  |  |
Alliance Pipeline Limited |  | — |  | — |  | — |  | 112 |  | — |
Aux Sable Midstream LLC |  | — |  | — |  | — |  | 14 |  | — |
Aux Sable Canada LP |  | — |  | — |  | 61 |  | 272 |  | — |
Seaway Crude Pipeline System |  | — |  | 327 |  | — |  | 240 |  | — |
Alliance Canada Marketing L.P. |  | — |  | — |  | 106 |  | 46 |  | — |
NEXUS Gas Transmission, LLC |  | 62 |  | 17 |  | — |  | — |  | 114 |
Vector Pipeline L.P. |  | — |  | 7 |  | — |  | — |  | 19 |
Énergir, L.P. |  | 38 |  | — |  | — |  | — |  | — |
DCP Midstream, LLC |  | 4 |  | — |  | 36 |  | — |  | — |
Gulfstream Management and Operating Services, LLC |  | — |  | 4 |  | — |  | — |  | — |
Sabal Trail Transmission, LLC |  | — |  | 23 |  | — |  | — |  | — |
Steckman Ridge |  | — |  | 4 |  | — |  | — |  | — |
Year ended December 31, 2018 |  | Transportation and Other Services | Operating and Administrative | Commodity Sales | Commodity Costs | Gas Distribution costs
(millions of Canadian dollars) |  |  |  |  |  |
Alliance Pipeline Limited |  | — |  | — |  | — |  | 93 |  | — |
Aux Sable Midstream LLC |  | — |  | — |  | — |  | 8 |  | — |
Aux Sable Canada LP |  | — |  | — |  | 72 |  | 189 |  | — |
Seaway Crude Pipeline System |  | — |  | 309 |  | — |  | 149 |  | — |
Alliance Canada Marketing L.P. |  | — |  | — |  | 125 |  | 49 |  | — |
NEXUS Gas Transmission, LLC |  | 9 |  | 2 |  | — |  | — |  | — |
Vector Pipeline L.P. |  | — |  | 7 |  | — |  | 1 |  | 20 |
DCP Midstream, LLC |  | 5 |  | — |  | 52 |  | — |  | — |
Gulfstream Management and Operating Services, LLC |  | — |  | 5 |  | — |  | — |  | — |
Sabal Trail Transmission, LLC |  | — |  | 18 |  | — |  | — |  | — |
Steckman Ridge |  | — |  | 4 |  | — |  | — |  | — |

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- Definition Tabular disclosure of related party transactions. Examples of related party transactions include, but are not limited to, transactions between (a) a parent company and its subsidiary; (b) subsidiaries of a common parent; (c) and entity and its principal owners and (d) affiliates. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration