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SUPPLEMENTAL FINANCIAL INFORMATION Company (Condensed Consolidated Statement of Cash Flows) (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Net Cash Provided by (Used in) Operating Activities [Abstract]    
Net Cash Provided by (Used in) Operating Activities, Continuing Operations $ 1,193 $ 1,053
Net Cash Provided by (Used in) Investing Activities [Abstract]    
Acquisition, net of cash acquired 0 (8,409)
Additions to property, plant and equipment (1,529) (1,080)
Purchase of investments subject to significant influence, inclusive of acquisition costs (note 15) (213) (276)
Proceeds from Sale of Equity Method Investments 0 665
Other investing activities (19) 63
Net cash used in investing activities (1,761) (9,037)
Net Cash Provided by (Used in) Financing Activities [Abstract]    
Change in short-term debt, net (31) 118
Proceeds from (Repayments of) Short-term Debt 383 0
Proceeds from Issuance of Long-term Debt 129 6,423
Proceeds from Convertible Debt 0 1,413
Retirement of long-term debt (453) (273)
Net repayments under committed credit facilities 230 (315)
Proceeds from Issuance of Common Stock 682 354
Dividends on common stock (287) (221)
Dividends on preferred stock (28) (28)
Dividends paid by subsidiaries to non-controlling interest (6) (5)
Proceeds from (Payments for) Other Financing Activities (26) (18)
Net Cash Provided by (Used in) Financing Activities, Continuing Operations 593 7,448
Effect of Exchange Rate on Cash and Cash Equivalents, Continuing Operations (13) (65)
Cash and Cash Equivalents, Period Increase (Decrease) 12 (601)
Beginning Balance 491  
Ending Balance 503 491
Consolidation, Eliminations [Member]    
Net Cash Provided by (Used in) Operating Activities [Abstract]    
Net Cash Provided by (Used in) Operating Activities, Continuing Operations (861) 171
Net Cash Provided by (Used in) Investing Activities [Abstract]    
Acquisition, net of cash acquired 0  
Additions to property, plant and equipment (13) 0
Purchase of investments subject to significant influence, inclusive of acquisition costs (note 15) 0 0
Proceeds from Sale of Equity Method Investments 0 0
Repayment of Notes Receivable from Related Parties (1,099) 9,179
Other investing activities 3 0
Net cash used in investing activities (1,109) 9,179
Net Cash Provided by (Used in) Financing Activities [Abstract]    
Change in short-term debt, net 0 14
Proceeds from Issuance of Long-term Debt 113 (5,081)
Proceeds from Convertible Debt 0 0
Retirement of long-term debt 15 19
Proceeds from Long-term Lines of Credit 6 (6)
Proceeds from Issuance of Common Stock 1,703 (4,202)
Issuance of preferred stock, net of issuance costs 195 (195)
Dividends on common stock 272 254
Dividends on preferred stock 42 49
Dividends paid by subsidiaries to non-controlling interest (4) (3)
Proceeds from (Payments for) Other Financing Activities (372) (185)
Net Cash Provided by (Used in) Financing Activities, Continuing Operations 1,970 (9,336)
Effect of Exchange Rate on Cash and Cash Equivalents, Continuing Operations 0 0
Cash and Cash Equivalents, Period Increase (Decrease) 0 14
Beginning Balance 0 (14)
Ending Balance 0 0
Parent Company [Member]    
Net Cash Provided by (Used in) Operating Activities [Abstract]    
Net Cash Provided by (Used in) Operating Activities, Continuing Operations 195 265
Net Cash Provided by (Used in) Investing Activities [Abstract]    
Acquisition, net of cash acquired 0  
Additions to property, plant and equipment (5) (2)
Purchase of investments subject to significant influence, inclusive of acquisition costs (note 15) 0 0
Proceeds from Sale of Equity Method Investments 0 665
Repayment of Notes Receivable from Related Parties (708) (2,348)
Other investing activities (34) 0
Net cash used in investing activities (747) (1,685)
Net Cash Provided by (Used in) Financing Activities [Abstract]    
Change in short-term debt, net 0 (14)
Proceeds from Issuance of Long-term Debt 0 2,037
Proceeds from Convertible Debt 0 (44)
Retirement of long-term debt 0 (250)
Proceeds from Long-term Lines of Credit (30) (210)
Proceeds from Issuance of Common Stock 682 354
Issuance of preferred stock, net of issuance costs 0 0
Dividends on common stock (287) (221)
Dividends on preferred stock (28) (28)
Dividends paid by subsidiaries to non-controlling interest 0 0
Proceeds from (Payments for) Other Financing Activities 290 0
Net Cash Provided by (Used in) Financing Activities, Continuing Operations 627 1,624
Effect of Exchange Rate on Cash and Cash Equivalents, Continuing Operations 1 (4)
Cash and Cash Equivalents, Period Increase (Decrease) 76 200
Beginning Balance 200 0
Ending Balance 276 200
Subsidiary Issuer [Member]    
Net Cash Provided by (Used in) Operating Activities [Abstract]    
Net Cash Provided by (Used in) Operating Activities, Continuing Operations 22 29
Net Cash Provided by (Used in) Investing Activities [Abstract]    
Acquisition, net of cash acquired 0  
Additions to property, plant and equipment 0 0
Purchase of investments subject to significant influence, inclusive of acquisition costs (note 15) 0 0
Proceeds from Sale of Equity Method Investments 0 0
Repayment of Notes Receivable from Related Parties (26) (4,416)
Other investing activities 0 0
Net cash used in investing activities (26) (4,416)
Net Cash Provided by (Used in) Financing Activities [Abstract]    
Change in short-term debt, net 0 0
Proceeds from Issuance of Long-term Debt 0 4,187
Proceeds from Convertible Debt 0 0
Retirement of long-term debt 0 0
Proceeds from Long-term Lines of Credit 0 0
Proceeds from Issuance of Common Stock 0 242
Issuance of preferred stock, net of issuance costs 0 0
Dividends on common stock 0 0
Dividends on preferred stock 0 0
Dividends paid by subsidiaries to non-controlling interest 0 0
Proceeds from (Payments for) Other Financing Activities 0 0
Net Cash Provided by (Used in) Financing Activities, Continuing Operations 0 4,429
Effect of Exchange Rate on Cash and Cash Equivalents, Continuing Operations (3) (14)
Cash and Cash Equivalents, Period Increase (Decrease) (7) 28
Beginning Balance 28 0
Ending Balance 21 28
Guarantor Subsidiaries [Member]    
Net Cash Provided by (Used in) Operating Activities [Abstract]    
Net Cash Provided by (Used in) Operating Activities, Continuing Operations 712 481
Net Cash Provided by (Used in) Investing Activities [Abstract]    
Acquisition, net of cash acquired 0 8,409
Additions to property, plant and equipment (1,031) (673)
Purchase of investments subject to significant influence, inclusive of acquisition costs (note 15) 0 0
Proceeds from Sale of Equity Method Investments 0 0
Repayment of Notes Receivable from Related Parties 15 (18)
Other investing activities (20) (3)
Net cash used in investing activities (1,036) (9,103)
Net Cash Provided by (Used in) Financing Activities [Abstract]    
Change in short-term debt, net (18) 122
Proceeds from (Repayments of) Short-term Debt 383  
Proceeds from Issuance of Long-term Debt 147 4,516
Proceeds from Convertible Debt 0 0
Retirement of long-term debt (413) (6)
Proceeds from Long-term Lines of Credit 21 0
Proceeds from Issuance of Common Stock 134 3,865
Issuance of preferred stock, net of issuance costs 0 195
Dividends on common stock 0 0
Dividends on preferred stock (29) (31)
Dividends paid by subsidiaries to non-controlling interest 0 0
Proceeds from (Payments for) Other Financing Activities 96 (18)
Net Cash Provided by (Used in) Financing Activities, Continuing Operations 321 8,643
Effect of Exchange Rate on Cash and Cash Equivalents, Continuing Operations 2 7
Cash and Cash Equivalents, Period Increase (Decrease) (1) 28
Beginning Balance 49 21
Ending Balance 48 49
Non-Guarantor Subsidiaries [Member]    
Net Cash Provided by (Used in) Operating Activities [Abstract]    
Net Cash Provided by (Used in) Operating Activities, Continuing Operations 1,125 107
Net Cash Provided by (Used in) Investing Activities [Abstract]    
Acquisition, net of cash acquired 0  
Additions to property, plant and equipment (480) (405)
Purchase of investments subject to significant influence, inclusive of acquisition costs (note 15) (213) (276)
Proceeds from Sale of Equity Method Investments 0 0
Repayment of Notes Receivable from Related Parties 1,818 (2,397)
Other investing activities 32 66
Net cash used in investing activities 1,157 (3,012)
Net Cash Provided by (Used in) Financing Activities [Abstract]    
Change in short-term debt, net (13) (4)
Proceeds from Issuance of Long-term Debt (131) 764
Proceeds from Convertible Debt 0 1,457
Retirement of long-term debt (55) (36)
Proceeds from Long-term Lines of Credit 233 (99)
Proceeds from Issuance of Common Stock (1,837) 95
Issuance of preferred stock, net of issuance costs (195) 0
Dividends on common stock (272) (254)
Dividends on preferred stock (13) (18)
Dividends paid by subsidiaries to non-controlling interest (2) (2)
Proceeds from (Payments for) Other Financing Activities (40) 185
Net Cash Provided by (Used in) Financing Activities, Continuing Operations (2,325) 2,088
Effect of Exchange Rate on Cash and Cash Equivalents, Continuing Operations (13) (54)
Cash and Cash Equivalents, Period Increase (Decrease) (56) (871)
Beginning Balance 214 1,085
Ending Balance $ 158 $ 214