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ACQUISITIONS AND DISPOSITIONS - Schedule of Supplemental Pro Forma Consolidated Financial Information (Details) - Moda Midstream Operating, LLC (Moda) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Business Acquisition [Line Items] |  |
Operating revenues | $ 47,339 | $ 39,435
Earnings attributable to common shareholders | 5,771 | 2,938
Acquisition-related expenses | 21 |
Acquisition-related expenses, after tax | 16 |
Amortization of fair value adjustments recorded for acquired property, plant and equipment, long-term investments and intangible assets | 193 | 207
Amortization of fair value adjustments recorded for acquired property, plant and equipment, long-term investments and intangible assets, after tax | $ 145 | $ 155

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- Definition The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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