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PROPERTY, PLANT AND EQUIPMENT - COMPONENTS (Details) - CAD CAD in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
PROPERTY, PLANT AND EQUIPMENT |  |  |
Property, plant and equipment, net | CAD 64,284 | CAD 64,434 |
Depreciation expense | 2,049 | 1,852 | CAD 1,461
Liquids Pipelines |  |  |
PROPERTY, PLANT AND EQUIPMENT |  |  |
Property, plant and equipment, gross | 52,661 | 52,634 |
Accumulated depreciation | (8,996) | (8,233) |
Property, plant and equipment, net | 43,665 | 44,401 |
Gas Distribution |  |  |
PROPERTY, PLANT AND EQUIPMENT |  |  |
Property, plant and equipment, gross | 10,299 | 9,806 |
Accumulated depreciation | (2,524) | (2,379) |
Property, plant and equipment, net | 7,775 | 7,427 |
Gas Pipelines and Processing |  |  |
PROPERTY, PLANT AND EQUIPMENT |  |  |
Property, plant and equipment, gross | 10,295 | 10,201 |
Accumulated depreciation | (2,167) | (2,003) |
Property, plant and equipment, net | 8,128 | 8,198 |
Green Power and Transmission |  |  |
PROPERTY, PLANT AND EQUIPMENT |  |  |
Property, plant and equipment, gross | 5,292 | 4,794 |
Accumulated depreciation | (778) | (600) |
Property, plant and equipment, net | 4,514 | 4,194 |
Energy Services |  |  |
PROPERTY, PLANT AND EQUIPMENT |  |  |
Property, plant and equipment, gross | 33 | 34 |
Accumulated depreciation | (13) | (13) |
Property, plant and equipment, net | 20 | 21 |
Eliminations and Other |  |  |
PROPERTY, PLANT AND EQUIPMENT |  |  |
Property, plant and equipment, gross | 315 | 331 |
Accumulated depreciation | (133) | (138) |
Property, plant and equipment, net | CAD 182 | 193 |
Pipeline | Liquids Pipelines |  |  |
PROPERTY, PLANT AND EQUIPMENT |  |  |
Weighted Average Depreciation Rate (as a percent) | 2.70% |  |
Property, plant and equipment, gross | CAD 30,809 | 31,092 |
Pipeline | Gas Pipelines and Processing |  |  |
PROPERTY, PLANT AND EQUIPMENT |  |  |
Weighted Average Depreciation Rate (as a percent) | 3.00% |  |
Property, plant and equipment, gross | CAD 3,665 | 3,557 |
Compressors, meters and other operating equipment | Gas Pipelines and Processing |  |  |
PROPERTY, PLANT AND EQUIPMENT |  |  |
Weighted Average Depreciation Rate (as a percent) | 2.40% |  |
Property, plant and equipment, gross | CAD 4,014 | 3,864 |
Processing and treating plants | Gas Pipelines and Processing |  |  |
PROPERTY, PLANT AND EQUIPMENT |  |  |
Weighted Average Depreciation Rate (as a percent) | 2.40% |  |
Property, plant and equipment, gross | CAD 846 | 869 |
Pumping equipment, buildings, tanks and other | Liquids Pipelines |  |  |
PROPERTY, PLANT AND EQUIPMENT |  |  |
Weighted Average Depreciation Rate (as a percent) | 3.00% |  |
Property, plant and equipment, gross | CAD 15,215 | 14,319 |
Pumping equipment, buildings, tanks and other | Gas Pipelines and Processing |  |  |
PROPERTY, PLANT AND EQUIPMENT |  |  |
Weighted Average Depreciation Rate (as a percent) | 8.40% |  |
Property, plant and equipment, gross | CAD 306 | 275 |
Pumping equipment, buildings, tanks and other | Energy Services |  |  |
PROPERTY, PLANT AND EQUIPMENT |  |  |
Weighted Average Depreciation Rate (as a percent) | 4.00% |  |
Property, plant and equipment, gross | CAD 33 | 34 |
Gas mains, services and other | Gas Distribution |  |  |
PROPERTY, PLANT AND EQUIPMENT |  |  |
Weighted Average Depreciation Rate (as a percent) | 3.10% |  |
Property, plant and equipment, gross | CAD 10,022 | 8,819 |
Wind turbines, solar panels and other | Green Power and Transmission |  |  |
PROPERTY, PLANT AND EQUIPMENT |  |  |
Weighted Average Depreciation Rate (as a percent) | 4.10% |  |
Property, plant and equipment, gross | CAD 4,259 | 4,311 |
Power transmission | Green Power and Transmission |  |  |
PROPERTY, PLANT AND EQUIPMENT |  |  |
Weighted Average Depreciation Rate (as a percent) | 2.20% |  |
Property, plant and equipment, gross | CAD 378 | 387 |
Land and right-of-way | Liquids Pipelines |  |  |
PROPERTY, PLANT AND EQUIPMENT |  |  |
Weighted Average Depreciation Rate (as a percent) | 2.40% |  |
Property, plant and equipment, gross | CAD 1,218 | 1,221 |
Land and right-of-way | Gas Distribution |  |  |
PROPERTY, PLANT AND EQUIPMENT |  |  |
Weighted Average Depreciation Rate (as a percent) | 1.00% |  |
Property, plant and equipment, gross | CAD 133 | 85 |
Land and right-of-way | Gas Pipelines and Processing |  |  |
PROPERTY, PLANT AND EQUIPMENT |  |  |
Weighted Average Depreciation Rate (as a percent) | 2.30% |  |
Property, plant and equipment, gross | CAD 673 | 680 |
Land and right-of-way | Green Power and Transmission |  |  |
PROPERTY, PLANT AND EQUIPMENT |  |  |
Weighted Average Depreciation Rate (as a percent) | 1.90% |  |
Property, plant and equipment, gross | CAD 43 | 45 |
Under construction | Liquids Pipelines |  |  |
PROPERTY, PLANT AND EQUIPMENT |  |  |
Property, plant and equipment, gross | 5,419 | 6,002 |
Under construction | Gas Distribution |  |  |
PROPERTY, PLANT AND EQUIPMENT |  |  |
Property, plant and equipment, gross | 144 | 902 |
Under construction | Gas Pipelines and Processing |  |  |
PROPERTY, PLANT AND EQUIPMENT |  |  |
Property, plant and equipment, gross | 791 | 956 |
Under construction | Green Power and Transmission |  |  |
PROPERTY, PLANT AND EQUIPMENT |  |  |
Property, plant and equipment, gross | CAD 612 | 51 |
Vehicles, office furniture, equipment and other | Eliminations and Other |  |  |
PROPERTY, PLANT AND EQUIPMENT |  |  |
Weighted Average Depreciation Rate (as a percent) | 9.30% |  |
Property, plant and equipment, gross | CAD 315 | CAD 331 |

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