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PLANT, PROPERTY AND EQUIPMENT (Details) - CAD ($)
$ in Millions
 1 Months Ended 12 Months Ended
Jul. 17, 2019
Dec. 31, 2018
Dec. 31, 2017
Oct. 05, 2017
Dec. 31, 2019
Dec. 31, 2019
Jan. 01, 2019
Plant, property and equipment              
Cost   $ 92,337     $ 92,807 $ 92,807  
Accumulated Depreciation   25,834     27,318 27,318  
Net Book Value   66,503     65,489 65,489 $ 67,088
Energy East, Eastern Mainline and Upland projects              
Plant, property and equipment              
Impairment charge       $ 83      
Impairment charge, net of tax       $ 64      
Power development project              
Plant, property and equipment              
Impairment charge     $ 21        
Impairment charge, net of tax     $ 16        
Bison              
Plant, property and equipment              
Impairment charge   722          
Impairment charge, net of tax and noncontrolling interest   140          
Gain on contract termination   130          
Gain on contract termination, net of tax and noncontrolling interest   25          
Canadian Natural Gas Pipelines | Under construction | NGTL System              
Plant, property and equipment              
Accumulated Depreciation   0     0 0  
Operating segments | Canadian Natural Gas Pipelines              
Plant, property and equipment              
Cost   33,897     38,090 38,090  
Accumulated Depreciation   17,884     18,832 18,832  
Net Book Value   16,013     19,258 19,258  
Operating segments | Canadian Natural Gas Pipelines | NGTL System              
Plant, property and equipment              
Cost   17,411     20,238 20,238  
Accumulated Depreciation   6,790     7,226 7,226  
Net Book Value   10,621     13,012 13,012  
Operating segments | Canadian Natural Gas Pipelines | Canadian Mainline              
Plant, property and equipment              
Cost   14,520     14,715 14,715  
Accumulated Depreciation   9,674     10,151 10,151  
Net Book Value   4,846     4,564 4,564  
Operating segments | Canadian Natural Gas Pipelines | Other              
Plant, property and equipment              
Cost   1,842     1,861 1,861  
Accumulated Depreciation   1,420     1,455 1,455  
Net Book Value   422     406 406  
Operating segments | Canadian Natural Gas Pipelines | Other Natural Gas Pipelines              
Plant, property and equipment              
Cost   1,966     3,137 3,137  
Accumulated Depreciation   1,420     1,455 1,455  
Net Book Value   546     1,682 1,682  
Operating segments | Canadian Natural Gas Pipelines | Pipeline | NGTL System              
Plant, property and equipment              
Cost   10,764     11,556 11,556  
Accumulated Depreciation   4,500     4,846 4,846  
Net Book Value   6,264     6,710 6,710  
Operating segments | Canadian Natural Gas Pipelines | Pipeline | Canadian Mainline              
Plant, property and equipment              
Cost   10,077     10,145 10,145  
Accumulated Depreciation   6,777     7,109 7,109  
Net Book Value   3,300     3,036 3,036  
Operating segments | Canadian Natural Gas Pipelines | Compression | NGTL System              
Plant, property and equipment              
Cost   3,289     4,205 4,205  
Accumulated Depreciation   1,677     1,771 1,771  
Net Book Value   1,612     2,434 2,434  
Operating segments | Canadian Natural Gas Pipelines | Compression | Canadian Mainline              
Plant, property and equipment              
Cost   3,642     3,867 3,867  
Accumulated Depreciation   2,656     2,823 2,823  
Net Book Value   986     1,044 1,044  
Operating segments | Canadian Natural Gas Pipelines | Metering and other | NGTL System              
Plant, property and equipment              
Cost   1,247     1,296 1,296  
Accumulated Depreciation   613     609 609  
Net Book Value   634     687 687  
Operating segments | Canadian Natural Gas Pipelines | Metering and other | Canadian Mainline              
Plant, property and equipment              
Cost   652     643 643  
Accumulated Depreciation   241     219 219  
Net Book Value   411     424 424  
Operating segments | Canadian Natural Gas Pipelines | Property, plant and equipment excluding under construction | NGTL System              
Plant, property and equipment              
Cost   15,300     17,057 17,057  
Accumulated Depreciation   6,790     7,226 7,226  
Net Book Value   8,510     9,831 9,831  
Operating segments | Canadian Natural Gas Pipelines | Property, plant and equipment excluding under construction | Canadian Mainline              
Plant, property and equipment              
Cost   14,371     14,655 14,655  
Accumulated Depreciation   9,674     10,151 10,151  
Net Book Value   4,697     4,504 4,504  
Operating segments | Canadian Natural Gas Pipelines | Under construction | NGTL System              
Plant, property and equipment              
Cost   2,111     3,181 3,181  
Net Book Value   2,111     3,181 3,181  
Operating segments | Canadian Natural Gas Pipelines | Under construction | Canadian Mainline              
Plant, property and equipment              
Cost   149     60 60  
Accumulated Depreciation   0     0 0  
Net Book Value   149     60 60  
Operating segments | Canadian Natural Gas Pipelines | Under construction | Other Natural Gas Pipelines              
Plant, property and equipment              
Cost   124     1,276 1,276  
Accumulated Depreciation   0     0 0  
Net Book Value   124     1,276 1,276  
Operating segments | U.S. Natural Gas Pipelines              
Plant, property and equipment              
Cost   31,444     31,250 31,250  
Accumulated Depreciation   4,454     4,890 4,890  
Net Book Value   26,990     26,360 26,360  
Operating segments | U.S. Natural Gas Pipelines | Other Natural Gas Pipelines              
Plant, property and equipment              
Cost   9,503     8,638 8,638  
Accumulated Depreciation   2,841     2,907 2,907  
Net Book Value   6,662     5,731 5,731  
Operating segments | U.S. Natural Gas Pipelines | Columbia Gas              
Plant, property and equipment              
Cost   16,874     17,471 17,471  
Accumulated Depreciation   458     720 720  
Net Book Value   16,416     16,751 16,751  
Operating segments | U.S. Natural Gas Pipelines | ANR              
Plant, property and equipment              
Cost   5,067     5,141 5,141  
Accumulated Depreciation   1,155     1,263 1,263  
Net Book Value   3,912     3,878 3,878  
Operating segments | U.S. Natural Gas Pipelines | Pipeline | Other              
Plant, property and equipment              
Cost   1,190     1,228 1,228  
Accumulated Depreciation   474     574 574  
Net Book Value   716     654 654  
Operating segments | U.S. Natural Gas Pipelines | Pipeline | Columbia Gas              
Plant, property and equipment              
Cost   6,711     9,708 9,708  
Accumulated Depreciation   251     389 389  
Net Book Value   6,460     9,319 9,319  
Operating segments | U.S. Natural Gas Pipelines | Pipeline | ANR              
Plant, property and equipment              
Cost   1,600     1,594 1,594  
Accumulated Depreciation   443     472 472  
Net Book Value   1,157     1,122 1,122  
Operating segments | U.S. Natural Gas Pipelines | Pipeline | GTN              
Plant, property and equipment              
Cost   2,322     2,257 2,257  
Accumulated Depreciation   951     969 969  
Net Book Value   1,371     1,288 1,288  
Operating segments | U.S. Natural Gas Pipelines | Pipeline | Great Lakes              
Plant, property and equipment              
Cost   2,180     2,090 2,090  
Accumulated Depreciation   1,251     1,208 1,208  
Net Book Value   929     882 882  
Operating segments | U.S. Natural Gas Pipelines | Pipeline | Columbia Gulf              
Plant, property and equipment              
Cost   1,753     2,597 2,597  
Accumulated Depreciation   74     114 114  
Net Book Value   1,679     2,483 2,483  
Operating segments | U.S. Natural Gas Pipelines | Pipeline | Midstream              
Plant, property and equipment              
Cost   1,212     302 302  
Accumulated Depreciation   91     42 42  
Net Book Value   1,121     260 260  
Operating segments | U.S. Natural Gas Pipelines | Compression | Columbia Gas              
Plant, property and equipment              
Cost   2,932     4,094 4,094  
Accumulated Depreciation   132     206 206  
Net Book Value   2,800     3,888 3,888  
Operating segments | U.S. Natural Gas Pipelines | Compression | ANR              
Plant, property and equipment              
Cost   1,978     2,050 2,050  
Accumulated Depreciation   388     436 436  
Net Book Value   1,590     1,614 1,614  
Operating segments | U.S. Natural Gas Pipelines | Metering and other | Columbia Gas              
Plant, property and equipment              
Cost   2,884     3,244 3,244  
Accumulated Depreciation   75     125 125  
Net Book Value   2,809     3,119 3,119  
Operating segments | U.S. Natural Gas Pipelines | Metering and other | ANR              
Plant, property and equipment              
Cost   1,217     1,245 1,245  
Accumulated Depreciation   324     355 355  
Net Book Value   893     890 890  
Operating segments | U.S. Natural Gas Pipelines | Property, plant and equipment excluding under construction | Other Natural Gas Pipelines              
Plant, property and equipment              
Cost   8,657     8,474 8,474  
Accumulated Depreciation   2,841     2,907 2,907  
Net Book Value   5,816     5,567 5,567  
Operating segments | U.S. Natural Gas Pipelines | Property, plant and equipment excluding under construction | Columbia Gas              
Plant, property and equipment              
Cost   12,527     17,046 17,046  
Accumulated Depreciation   458     720 720  
Net Book Value   12,069     16,326 16,326  
Operating segments | U.S. Natural Gas Pipelines | Property, plant and equipment excluding under construction | ANR              
Plant, property and equipment              
Cost   4,795     4,889 4,889  
Accumulated Depreciation   1,155     1,263 1,263  
Net Book Value   3,640     3,626 3,626  
Operating segments | U.S. Natural Gas Pipelines | Under construction              
Plant, property and equipment              
Accumulated Depreciation   0     0 0  
Operating segments | U.S. Natural Gas Pipelines | Under construction | Other Natural Gas Pipelines              
Plant, property and equipment              
Cost   846     164 164  
Accumulated Depreciation   0     0 0  
Net Book Value   846     164 164  
Operating segments | U.S. Natural Gas Pipelines | Under construction | Columbia Gas              
Plant, property and equipment              
Cost   4,347     425 425  
Accumulated Depreciation   0     0 0  
Net Book Value   4,347     425 425  
Operating segments | U.S. Natural Gas Pipelines | Under construction | ANR              
Plant, property and equipment              
Cost   272     252 252  
Net Book Value   272     252 252  
Operating segments | Mexico Natural Gas Pipelines              
Plant, property and equipment              
Cost   6,308     6,438 6,438  
Accumulated Depreciation   433     518 518  
Net Book Value   5,875     5,920 5,920  
Operating segments | Mexico Natural Gas Pipelines | Pipeline              
Plant, property and equipment              
Cost   3,172     2,988 2,988  
Accumulated Depreciation   301     340 340  
Net Book Value   2,871     2,648 2,648  
Operating segments | Mexico Natural Gas Pipelines | Compression              
Plant, property and equipment              
Cost   506     486 486  
Accumulated Depreciation   41     54 54  
Net Book Value   465     432 432  
Operating segments | Mexico Natural Gas Pipelines | Metering and other              
Plant, property and equipment              
Cost   640     643 643  
Accumulated Depreciation   91     124 124  
Net Book Value   549     519 519  
Operating segments | Mexico Natural Gas Pipelines | Property, plant and equipment excluding under construction              
Plant, property and equipment              
Cost   4,318     4,117 4,117  
Accumulated Depreciation   433     518 518  
Net Book Value   3,885     3,599 3,599  
Operating segments | Mexico Natural Gas Pipelines | Under construction              
Plant, property and equipment              
Cost   1,990     2,321 2,321  
Accumulated Depreciation   0     0 0  
Net Book Value   1,990     2,321 2,321  
Operating segments | Liquids Pipelines              
Plant, property and equipment              
Cost   15,702     14,142 14,142  
Accumulated Depreciation   1,976     2,167 2,167  
Net Book Value   13,726     11,975 11,975  
Operating segments | Liquids Pipelines | Keystone Pipeline System              
Plant, property and equipment              
Cost   14,461     13,948 13,948  
Accumulated Depreciation   1,943     2,163 2,163  
Net Book Value   12,518     11,785 11,785  
Operating segments | Liquids Pipelines | Intra-Alberta Pipelines              
Plant, property and equipment              
Cost   1,241     194 194  
Accumulated Depreciation   33     4 4  
Net Book Value   1,208     190 190  
Operating segments | Liquids Pipelines | Pipeline | Keystone Pipeline System              
Plant, property and equipment              
Cost   9,780     9,378 9,378  
Accumulated Depreciation   1,271     1,403 1,403  
Net Book Value   8,509     7,975 7,975  
Operating segments | Liquids Pipelines | Pipeline | Intra-Alberta Pipelines              
Plant, property and equipment              
Cost   762     138 138  
Accumulated Depreciation   22     2 2  
Net Book Value   740     136 136  
Operating segments | Liquids Pipelines | Pumping equipment | Keystone Pipeline System              
Plant, property and equipment              
Cost   1,065     1,035 1,035  
Accumulated Depreciation   184     204 204  
Net Book Value   881     831 831  
Operating segments | Liquids Pipelines | Pumping equipment | Intra-Alberta Pipelines              
Plant, property and equipment              
Cost   104     0 0  
Accumulated Depreciation   3     0 0  
Net Book Value   101     0 0  
Operating segments | Liquids Pipelines | Tanks and other | Keystone Pipeline System              
Plant, property and equipment              
Cost   3,598     3,488 3,488  
Accumulated Depreciation   488     556 556  
Net Book Value   3,110     2,932 2,932  
Operating segments | Liquids Pipelines | Tanks and other | Intra-Alberta Pipelines              
Plant, property and equipment              
Cost   291     56 56  
Accumulated Depreciation   8     2 2  
Net Book Value   283     54 54  
Operating segments | Liquids Pipelines | Property, plant and equipment excluding under construction | Keystone Pipeline System              
Plant, property and equipment              
Cost   14,443     13,901 13,901  
Accumulated Depreciation   1,943     2,163 2,163  
Net Book Value   12,500     11,738 11,738  
Operating segments | Liquids Pipelines | Property, plant and equipment excluding under construction | Intra-Alberta Pipelines              
Plant, property and equipment              
Cost   1,157     194 194  
Accumulated Depreciation   33     4 4  
Net Book Value   1,124     190 190  
Operating segments | Liquids Pipelines | Under construction | Keystone Pipeline System              
Plant, property and equipment              
Cost   18     47 47  
Accumulated Depreciation   0     0 0  
Net Book Value   18     47 47  
Operating segments | Liquids Pipelines | Under construction | Intra-Alberta Pipelines              
Plant, property and equipment              
Cost   84     0 0  
Accumulated Depreciation   0     0 0  
Net Book Value   84     0 0  
Operating segments | Power and Storage              
Plant, property and equipment              
Cost   4,538     2,004 2,004  
Accumulated Depreciation   877     703 703  
Net Book Value   3,661     1,301 1,301  
Operating segments | Power and Storage | Natural Gas              
Plant, property and equipment              
Cost   2,062     1,256 1,256  
Accumulated Depreciation   708     522 522  
Net Book Value   1,354     734 734  
Operating segments | Power and Storage | Natural Gas Storage and Other              
Plant, property and equipment              
Cost   741     742 742  
Accumulated Depreciation   169     181 181  
Net Book Value   572     561 561  
Operating segments | Power and Storage | Property, plant and equipment excluding under construction              
Plant, property and equipment              
Cost   2,803     1,998 1,998  
Accumulated Depreciation   877     703 703  
Net Book Value   1,926     1,295 1,295  
Operating segments | Power and Storage | Under construction              
Plant, property and equipment              
Cost   1,735     6 6  
Accumulated Depreciation   0     0 0  
Net Book Value   1,735     6 6  
Corporate              
Plant, property and equipment              
Cost   448     883 883  
Accumulated Depreciation   210     208 208  
Net Book Value   $ 238     $ 675 $ 675  
TC PipeLines, LP              
Plant, property and equipment              
Noncontrolling interest, ownership interest by parent         25.50% 25.50%  
Disposal group, disposed of by sale, not discontinued operations | KKR and AIMCo | Coastal GasLink pipeline project              
Plant, property and equipment              
Equity interest         65.00%    
Disposal group, disposed of by sale, not discontinued operations | 20 First Nations | Coastal GasLink pipeline project              
Plant, property and equipment              
Equity interest           10.00%  
Northern Courier pipeline | Disposal group, disposed of by sale, not discontinued operations              
Plant, property and equipment              
Ownership interest sold 85.00%            
Northern Courier pipeline | Liquids Pipelines              
Plant, property and equipment              
Ownership interest percentage 15.00%       15.00% 15.00%