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Consolidated Statements of Cash Flows - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Operating activities    
Net income $ 747 $ 299
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 928 851
Income from equity investments, net of dividends (75) (90)
Allowance for equity funds used during construction (19) (9)
Deferred income taxes, net 185 469
Net change in pension and post-retirement obligations 11 (12)
Regulated Fuel Adjustments Mechanism (16) 68
Net changes in fair value of derivative instruments 55 (157)
Net change in regulatory assets and liabilities 51 (237)
Net change in capitalized transportation capacity (105) 84
Other operating activities, net 44 31
Changes in non-cash working capital 116 104
Net cash provided by operating activities 1,690 1,193
Investing activities    
Additions to property, plant and equipment (2,162) (1,529)
Purchase of investments subject to significant influence, inclusive of acquisition costs (49) (213)
Other investing activities 21 (19)
Net cash used in investing activities (2,190) (1,761)
Financing activities    
Change in short-term debt, net 99 (31)
Proceeds from short term debt 129 383
Repayment of short term debt (390) 0
Proceeds from long-term debt 1,055 129
Retirement of long-term debt (757) (453)
Net borrowings under committed credit facilities 321 230
Issuance of preferred stock, net of issuance costs 291 0
Dividends on common stock (346) (287)
Dividends on preferred stock (36) (28)
Other financing activities (32) (32)
Issuance of common stock, net of issuance costs 10 682
Net cash provided by financing activities 344 593
Effect of exchange rate changes on cash and cash equivalents 25 (13)
Net increase (decrease) in cash and cash equivalents (131) 12
Cash and cash equivalents, beginning of period 503 491
Cash and cash equivalents, end of period 372 503
Cash and cash equivalents consists of:    
Cash 273 216
Short-term investments 43 222
Restricted cash $ 56 $ 65