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PENSION AND OTHER POSTRETIREMENT BENEFITS - PLAN ASSETS (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Pension | Equity Securities, US | Level 2    
Change in plan assets    
Fair value of plan assets at beginning of year $ 0  
Fair value of plan assets at end of year 0 $ 0
Pension | Equity Securities, US | Level 3    
Change in plan assets    
Fair value of plan assets at beginning of year 0  
Fair value of plan assets at end of year $ 0 $ 0
Canada | Equity securities    
Pension and Other Postretirement Benefit Disclosures    
Plan asset allocations 45800000.00% 52.00%
Canada | Fixed income securities    
Pension and Other Postretirement Benefit Disclosures    
Plan asset allocations 33400000.00% 34.20%
Canada | Other    
Pension and Other Postretirement Benefit Disclosures    
Plan asset allocations 20700000.00% 13.80%
Canada | Pension    
Change in plan assets    
Fair value of plan assets at beginning of year $ 3,619 $ 2,019
Fair value of plan assets at end of year 3,523 3,619
Canada | Pension | Level 1    
Change in plan assets    
Fair value of plan assets at beginning of year 2,861  
Fair value of plan assets at end of year 2,979 2,861
Canada | Pension | Level 2    
Change in plan assets    
Fair value of plan assets at beginning of year 418  
Fair value of plan assets at end of year (18) 418
Canada | Pension | Level 3    
Change in plan assets    
Fair value of plan assets at beginning of year 340 281
Unrealized and realized gains 77 26
Purchases and settlements, net 145 33
Fair value of plan assets at end of year 562 340
Canada | Pension | Cash and Cash Equivalents | Fair Value    
Change in plan assets    
Fair value of plan assets at beginning of year 169  
Fair value of plan assets at end of year 246 169
Canada | Pension | Cash and Cash Equivalents | Level 1 | Fair Value    
Change in plan assets    
Fair value of plan assets at beginning of year 169  
Fair value of plan assets at end of year 246 169
Canada | Pension | Equity Securities, Non-US    
Change in plan assets    
Fair value of plan assets at beginning of year 1,267  
Fair value of plan assets at end of year 623 1,267
Canada | Pension | Equity Securities, Non-US | Level 1    
Change in plan assets    
Fair value of plan assets at beginning of year 842  
Fair value of plan assets at end of year 623 842
Canada | Pension | Equity Securities, Non-US | Level 2    
Change in plan assets    
Fair value of plan assets at beginning of year 425  
Fair value of plan assets at end of year 0 425
Canada | Pension | Equity Securities, Non-US | Level 3    
Change in plan assets    
Fair value of plan assets at beginning of year 0  
Fair value of plan assets at end of year 0 0
Canada | Pension | Equity Securities, US    
Change in plan assets    
Fair value of plan assets at beginning of year 427  
Fair value of plan assets at end of year (1) 427
Canada | Pension | Equity Securities, US | Level 1    
Change in plan assets    
Fair value of plan assets at beginning of year 427  
Fair value of plan assets at end of year (1) 427
Canada | Pension | Equity Securities, Global    
Change in plan assets    
Fair value of plan assets at beginning of year 189  
Fair value of plan assets at end of year 993 189
Canada | Pension | Equity Securities, Global | Level 1    
Change in plan assets    
Fair value of plan assets at beginning of year 189  
Fair value of plan assets at end of year 993 189
Canada | Pension | Equity Securities, Global | Level 2    
Change in plan assets    
Fair value of plan assets at beginning of year 0  
Fair value of plan assets at end of year 0 0
Canada | Pension | Equity Securities, Global | Level 3    
Change in plan assets    
Fair value of plan assets at beginning of year 0  
Fair value of plan assets at end of year 0 0
Canada | Pension | Government | Fair Value    
Change in plan assets    
Fair value of plan assets at beginning of year 933  
Fair value of plan assets at end of year 661 933
Canada | Pension | Government | Level 1 | Fair Value    
Change in plan assets    
Fair value of plan assets at beginning of year 933  
Fair value of plan assets at end of year 661 933
Canada | Pension | Government | Level 2 | Fair Value    
Change in plan assets    
Fair value of plan assets at beginning of year 0  
Fair value of plan assets at end of year 0 0
Canada | Pension | Government | Level 3 | Fair Value    
Change in plan assets    
Fair value of plan assets at beginning of year 0  
Fair value of plan assets at end of year 0 0
Canada | Pension | Corporate | Fair Value    
Change in plan assets    
Fair value of plan assets at beginning of year 304  
Fair value of plan assets at end of year 517 304
Canada | Pension | Corporate | Level 1 | Fair Value    
Change in plan assets    
Fair value of plan assets at beginning of year 301  
Fair value of plan assets at end of year 457 301
Canada | Pension | Corporate | Level 2 | Fair Value    
Change in plan assets    
Fair value of plan assets at beginning of year 3  
Fair value of plan assets at end of year 0 3
Canada | Pension | Corporate | Level 3 | Fair Value    
Change in plan assets    
Fair value of plan assets at beginning of year 0  
Fair value of plan assets at end of year 60 0
Canada | Pension | Infrastructure and real estate | Fair Value    
Change in plan assets    
Fair value of plan assets at beginning of year 340  
Fair value of plan assets at end of year 502 340
Canada | Pension | Infrastructure and real estate | Level 1 | Fair Value    
Change in plan assets    
Fair value of plan assets at beginning of year 0  
Fair value of plan assets at end of year 0 0
Canada | Pension | Infrastructure and real estate | Level 2 | Fair Value    
Change in plan assets    
Fair value of plan assets at beginning of year 0  
Fair value of plan assets at end of year 0 0
Canada | Pension | Infrastructure and real estate | Level 3 | Fair Value    
Change in plan assets    
Fair value of plan assets at beginning of year 340  
Fair value of plan assets at end of year 502 340
Canada | Pension | Forward currency contracts | Fair Value    
Change in plan assets    
Fair value of plan assets at beginning of year (10)  
Fair value of plan assets at end of year (18) (10)
Canada | Pension | Forward currency contracts | Level 1 | Fair Value    
Change in plan assets    
Fair value of plan assets at beginning of year 0  
Fair value of plan assets at end of year 0 0
Canada | Pension | Forward currency contracts | Level 2 | Fair Value    
Change in plan assets    
Fair value of plan assets at beginning of year (10)  
Fair value of plan assets at end of year (18) (10)
Canada | Pension | Forward currency contracts | Level 3 | Fair Value    
Change in plan assets    
Fair value of plan assets at beginning of year 0  
Fair value of plan assets at end of year 0 0
Canada | OPEB    
Change in plan assets    
Fair value of plan assets at beginning of year 0 0
Fair value of plan assets at end of year 0 0
Canada | OPEB | Fair Value    
Change in plan assets    
Fair value of plan assets at beginning of year 0  
Fair value of plan assets at end of year 0 0
Canada | OPEB | Level 1 | Fair Value    
Change in plan assets    
Fair value of plan assets at beginning of year 0  
Fair value of plan assets at end of year 0 0
Canada | OPEB | Level 2 | Fair Value    
Change in plan assets    
Fair value of plan assets at beginning of year 0  
Fair value of plan assets at end of year 0 0
Canada | OPEB | Level 3    
Change in plan assets    
Fair value of plan assets at beginning of year 0 0
Unrealized and realized gains 0 0
Purchases and settlements, net 0 0
Fair value of plan assets at end of year 0 0
Canada | OPEB | Level 3 | Fair Value    
Change in plan assets    
Fair value of plan assets at beginning of year 0  
Fair value of plan assets at end of year 0 0
Canada | OPEB | Cash and Cash Equivalents | Fair Value    
Change in plan assets    
Fair value of plan assets at beginning of year 0  
Fair value of plan assets at end of year 0 0
Canada | OPEB | Cash and Cash Equivalents | Level 1 | Fair Value    
Change in plan assets    
Fair value of plan assets at beginning of year 0  
Fair value of plan assets at end of year 0 0
Canada | OPEB | Equity Securities, US    
Change in plan assets    
Fair value of plan assets at beginning of year 0  
Fair value of plan assets at end of year 0 0
Canada | OPEB | Equity Securities, US | Level 1    
Change in plan assets    
Fair value of plan assets at beginning of year 0  
Fair value of plan assets at end of year 0 0
Canada | OPEB | Equity Securities, US | Level 2    
Change in plan assets    
Fair value of plan assets at beginning of year 0  
Fair value of plan assets at end of year 0 0
Canada | OPEB | Equity Securities, US | Level 3    
Change in plan assets    
Fair value of plan assets at beginning of year 0  
Fair value of plan assets at end of year 0 0
Canada | OPEB | Equity Securities, Global    
Change in plan assets    
Fair value of plan assets at beginning of year 0  
Fair value of plan assets at end of year 0 0
Canada | OPEB | Equity Securities, Global | Level 1    
Change in plan assets    
Fair value of plan assets at beginning of year 0  
Fair value of plan assets at end of year 0 0
Canada | OPEB | Equity Securities, Global | Level 2    
Change in plan assets    
Fair value of plan assets at beginning of year 0  
Fair value of plan assets at end of year 0 0
Canada | OPEB | Equity Securities, Global | Level 3    
Change in plan assets    
Fair value of plan assets at beginning of year 0  
Fair value of plan assets at end of year 0 0
Canada | OPEB | Government | Fair Value    
Change in plan assets    
Fair value of plan assets at beginning of year 0  
Fair value of plan assets at end of year 0 0
Canada | OPEB | Government | Level 1 | Fair Value    
Change in plan assets    
Fair value of plan assets at beginning of year 0  
Fair value of plan assets at end of year 0 0
Canada | OPEB | Government | Level 2 | Fair Value    
Change in plan assets    
Fair value of plan assets at beginning of year 0  
Fair value of plan assets at end of year 0 0
Canada | OPEB | Government | Level 3 | Fair Value    
Change in plan assets    
Fair value of plan assets at beginning of year 0  
Fair value of plan assets at end of year 0 $ 0
Canada | OPEB | Corporate | Fair Value    
Change in plan assets    
Fair value of plan assets at end of year 0  
Canada | OPEB | Corporate | Level 1 | Fair Value    
Change in plan assets    
Fair value of plan assets at end of year 0  
Canada | OPEB | Corporate | Level 2 | Fair Value    
Change in plan assets    
Fair value of plan assets at end of year 0  
Canada | OPEB | Corporate | Level 3 | Fair Value    
Change in plan assets    
Fair value of plan assets at end of year 0  
Canada | OPEB | Infrastructure and real estate | Fair Value    
Change in plan assets    
Fair value of plan assets at end of year 0  
Canada | OPEB | Infrastructure and real estate | Level 1 | Fair Value    
Change in plan assets    
Fair value of plan assets at end of year 0  
Canada | OPEB | Infrastructure and real estate | Level 2 | Fair Value    
Change in plan assets    
Fair value of plan assets at end of year 0  
Canada | OPEB | Infrastructure and real estate | Level 3 | Fair Value    
Change in plan assets    
Fair value of plan assets at end of year $ 0  
United States | Equity securities    
Pension and Other Postretirement Benefit Disclosures    
Plan asset allocations 51.70% 47.10%
United States | Fixed income securities    
Pension and Other Postretirement Benefit Disclosures    
Plan asset allocations 32.90% 47.70%
United States | Other    
Pension and Other Postretirement Benefit Disclosures    
Plan asset allocations 15.40% 5.20%
United States | Pension    
Change in plan assets    
Fair value of plan assets at beginning of year $ 1,097 $ 361
Fair value of plan assets at end of year 1,045 1,097
United States | Pension | Level 1    
Change in plan assets    
Fair value of plan assets at beginning of year 989  
Fair value of plan assets at end of year 915 989
United States | Pension | Level 2    
Change in plan assets    
Fair value of plan assets at beginning of year 52  
Fair value of plan assets at end of year 0 52
United States | Pension | Level 3    
Change in plan assets    
Fair value of plan assets at beginning of year 56 40
Unrealized and realized gains 9 5
Purchases and settlements, net 65 11
Fair value of plan assets at end of year 130 56
United States | Pension | Cash and Cash Equivalents | Fair Value    
Change in plan assets    
Fair value of plan assets at beginning of year 2  
Fair value of plan assets at end of year 56 2
United States | Pension | Cash and Cash Equivalents | Level 1 | Fair Value    
Change in plan assets    
Fair value of plan assets at beginning of year 2  
Fair value of plan assets at end of year 56 2
United States | Pension | Equity Securities, Non-US    
Change in plan assets    
Fair value of plan assets at beginning of year 0  
Fair value of plan assets at end of year 1 0
United States | Pension | Equity Securities, Non-US | Level 1    
Change in plan assets    
Fair value of plan assets at beginning of year 0  
Fair value of plan assets at end of year 1 0
United States | Pension | Equity Securities, Non-US | Level 2    
Change in plan assets    
Fair value of plan assets at beginning of year 0  
Fair value of plan assets at end of year 0 0
United States | Pension | Equity Securities, Non-US | Level 3    
Change in plan assets    
Fair value of plan assets at beginning of year 0  
Fair value of plan assets at end of year 0 0
United States | Pension | Equity Securities, US    
Change in plan assets    
Fair value of plan assets at beginning of year 343  
Fair value of plan assets at end of year 50 343
United States | Pension | Equity Securities, US | Level 1    
Change in plan assets    
Fair value of plan assets at beginning of year 343  
Fair value of plan assets at end of year 50 343
United States | Pension | Equity Securities, Global    
Change in plan assets    
Fair value of plan assets at beginning of year 174  
Fair value of plan assets at end of year 489 174
United States | Pension | Equity Securities, Global | Level 1    
Change in plan assets    
Fair value of plan assets at beginning of year 122  
Fair value of plan assets at end of year 489 122
United States | Pension | Equity Securities, Global | Level 2    
Change in plan assets    
Fair value of plan assets at beginning of year 52  
Fair value of plan assets at end of year 0 52
United States | Pension | Equity Securities, Global | Level 3    
Change in plan assets    
Fair value of plan assets at beginning of year 0  
Fair value of plan assets at end of year 0 0
United States | Pension | Government | Fair Value    
Change in plan assets    
Fair value of plan assets at beginning of year 0  
Fair value of plan assets at end of year 265 0
United States | Pension | Government | Level 1 | Fair Value    
Change in plan assets    
Fair value of plan assets at beginning of year 0  
Fair value of plan assets at end of year 265 0
United States | Pension | Government | Level 2 | Fair Value    
Change in plan assets    
Fair value of plan assets at beginning of year 0  
Fair value of plan assets at end of year 0 0
United States | Pension | Government | Level 3 | Fair Value    
Change in plan assets    
Fair value of plan assets at beginning of year 0  
Fair value of plan assets at end of year 0 0
United States | Pension | Corporate | Fair Value    
Change in plan assets    
Fair value of plan assets at beginning of year 523  
Fair value of plan assets at end of year 79 523
United States | Pension | Corporate | Level 1 | Fair Value    
Change in plan assets    
Fair value of plan assets at beginning of year 522  
Fair value of plan assets at end of year 54 522
United States | Pension | Corporate | Level 2 | Fair Value    
Change in plan assets    
Fair value of plan assets at beginning of year 1  
Fair value of plan assets at end of year 0 1
United States | Pension | Corporate | Level 3 | Fair Value    
Change in plan assets    
Fair value of plan assets at beginning of year 0  
Fair value of plan assets at end of year 25 0
United States | Pension | Infrastructure and real estate | Fair Value    
Change in plan assets    
Fair value of plan assets at beginning of year 56  
Fair value of plan assets at end of year 105 56
United States | Pension | Infrastructure and real estate | Level 1 | Fair Value    
Change in plan assets    
Fair value of plan assets at beginning of year 0  
Fair value of plan assets at end of year 0 0
United States | Pension | Infrastructure and real estate | Level 2 | Fair Value    
Change in plan assets    
Fair value of plan assets at beginning of year 0  
Fair value of plan assets at end of year 0 0
United States | Pension | Infrastructure and real estate | Level 3 | Fair Value    
Change in plan assets    
Fair value of plan assets at beginning of year 56  
Fair value of plan assets at end of year 105 56
United States | Pension | Forward currency contracts | Fair Value    
Change in plan assets    
Fair value of plan assets at beginning of year (1)  
Fair value of plan assets at end of year 0 (1)
United States | Pension | Forward currency contracts | Level 1 | Fair Value    
Change in plan assets    
Fair value of plan assets at beginning of year 0  
Fair value of plan assets at end of year 0 0
United States | Pension | Forward currency contracts | Level 2 | Fair Value    
Change in plan assets    
Fair value of plan assets at beginning of year (1)  
Fair value of plan assets at end of year 0 (1)
United States | Pension | Forward currency contracts | Level 3 | Fair Value    
Change in plan assets    
Fair value of plan assets at beginning of year 0  
Fair value of plan assets at end of year 0 0
United States | OPEB    
Change in plan assets    
Fair value of plan assets at beginning of year 213 115
Fair value of plan assets at end of year 181 213
United States | OPEB | Fair Value    
Change in plan assets    
Fair value of plan assets at beginning of year 213  
Fair value of plan assets at end of year 181 213
United States | OPEB | Level 1 | Fair Value    
Change in plan assets    
Fair value of plan assets at beginning of year 213  
Fair value of plan assets at end of year 176 213
United States | OPEB | Level 2 | Fair Value    
Change in plan assets    
Fair value of plan assets at beginning of year 0  
Fair value of plan assets at end of year 0 0
United States | OPEB | Level 3    
Change in plan assets    
Fair value of plan assets at beginning of year 0 0
Unrealized and realized gains 0 0
Purchases and settlements, net 5 0
Fair value of plan assets at end of year 5 0
United States | OPEB | Level 3 | Fair Value    
Change in plan assets    
Fair value of plan assets at beginning of year 0  
Fair value of plan assets at end of year 5 0
United States | OPEB | Cash and Cash Equivalents | Fair Value    
Change in plan assets    
Fair value of plan assets at beginning of year 1  
Fair value of plan assets at end of year 7 1
United States | OPEB | Cash and Cash Equivalents | Level 1 | Fair Value    
Change in plan assets    
Fair value of plan assets at beginning of year 1  
Fair value of plan assets at end of year 7 1
United States | OPEB | Equity Securities, US    
Change in plan assets    
Fair value of plan assets at beginning of year 80  
Fair value of plan assets at end of year 63 80
United States | OPEB | Equity Securities, US | Level 1    
Change in plan assets    
Fair value of plan assets at beginning of year 80  
Fair value of plan assets at end of year 63 80
United States | OPEB | Equity Securities, US | Level 2    
Change in plan assets    
Fair value of plan assets at beginning of year 0  
Fair value of plan assets at end of year 0 0
United States | OPEB | Equity Securities, US | Level 3    
Change in plan assets    
Fair value of plan assets at beginning of year 0  
Fair value of plan assets at end of year 0 0
United States | OPEB | Equity Securities, Global    
Change in plan assets    
Fair value of plan assets at beginning of year 36  
Fair value of plan assets at end of year 35 36
United States | OPEB | Equity Securities, Global | Level 1    
Change in plan assets    
Fair value of plan assets at beginning of year 36  
Fair value of plan assets at end of year 35 36
United States | OPEB | Equity Securities, Global | Level 2    
Change in plan assets    
Fair value of plan assets at beginning of year 0  
Fair value of plan assets at end of year 0 0
United States | OPEB | Equity Securities, Global | Level 3    
Change in plan assets    
Fair value of plan assets at beginning of year 0  
Fair value of plan assets at end of year 0 0
United States | OPEB | Government | Fair Value    
Change in plan assets    
Fair value of plan assets at beginning of year 96  
Fair value of plan assets at end of year 68 96
United States | OPEB | Government | Level 1 | Fair Value    
Change in plan assets    
Fair value of plan assets at beginning of year 96  
Fair value of plan assets at end of year 68 96
United States | OPEB | Government | Level 2 | Fair Value    
Change in plan assets    
Fair value of plan assets at beginning of year 0  
Fair value of plan assets at end of year 0 0
United States | OPEB | Government | Level 3 | Fair Value    
Change in plan assets    
Fair value of plan assets at beginning of year 0  
Fair value of plan assets at end of year 0 $ 0
United States | OPEB | Corporate | Fair Value    
Change in plan assets    
Fair value of plan assets at end of year 5  
United States | OPEB | Corporate | Level 1 | Fair Value    
Change in plan assets    
Fair value of plan assets at end of year 3  
United States | OPEB | Corporate | Level 2 | Fair Value    
Change in plan assets    
Fair value of plan assets at end of year 0  
United States | OPEB | Corporate | Level 3 | Fair Value    
Change in plan assets    
Fair value of plan assets at end of year 2  
United States | OPEB | Infrastructure and real estate | Fair Value    
Change in plan assets    
Fair value of plan assets at end of year 3  
United States | OPEB | Infrastructure and real estate | Level 1 | Fair Value    
Change in plan assets    
Fair value of plan assets at end of year 0  
United States | OPEB | Infrastructure and real estate | Level 2 | Fair Value    
Change in plan assets    
Fair value of plan assets at end of year 0  
United States | OPEB | Infrastructure and real estate | Level 3 | Fair Value    
Change in plan assets    
Fair value of plan assets at end of year $ 3  
Minimum | Canada | Equity securities    
Pension and Other Postretirement Benefit Disclosures    
Allocation of plan assets (as a percent) 40.00%  
Minimum | Canada | Fixed income securities    
Pension and Other Postretirement Benefit Disclosures    
Allocation of plan assets (as a percent) 27.50%  
Minimum | Canada | Other    
Pension and Other Postretirement Benefit Disclosures    
Allocation of plan assets (as a percent) 0.00%  
Minimum | United States | Equity securities    
Pension and Other Postretirement Benefit Disclosures    
Allocation of plan assets (as a percent) 52.50%  
Minimum | United States | Fixed income securities    
Pension and Other Postretirement Benefit Disclosures    
Allocation of plan assets (as a percent) 27.50%  
Minimum | United States | Other    
Pension and Other Postretirement Benefit Disclosures    
Allocation of plan assets (as a percent) 0.00%  
Maximum | Canada | Equity securities    
Pension and Other Postretirement Benefit Disclosures    
Allocation of plan assets (as a percent) 70.00%  
Maximum | Canada | Fixed income securities    
Pension and Other Postretirement Benefit Disclosures    
Allocation of plan assets (as a percent) 60.00%  
Maximum | Canada | Other    
Pension and Other Postretirement Benefit Disclosures    
Allocation of plan assets (as a percent) 20.00%  
Maximum | United States | Equity securities    
Pension and Other Postretirement Benefit Disclosures    
Allocation of plan assets (as a percent) 70.00%  
Maximum | United States | Fixed income securities    
Pension and Other Postretirement Benefit Disclosures    
Allocation of plan assets (as a percent) 30.00%  
Maximum | United States | Other    
Pension and Other Postretirement Benefit Disclosures    
Allocation of plan assets (as a percent) 20.00%