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Income Taxes (Effective Tax Rate) (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Income before provision for income taxes $ 816 $ 819
Statutory income tax rate 31.00% 31.00%
Income taxes, at statutory income tax rates $ 253 $ 254
Deferred income taxes on regulated income recorded as regulatory assets and regulatory liabilities (59) (54)
Foreign tax rate variance (55) 36
Amortization of deferred income tax regulatory liabilities (37) 0
Florida state tax apportionment adjustment (23) 0
Tax effect of equity earnings 15 12
Financing deductions (4) (17)
Other 9 (4)
Income Tax Expense (Benefit), Total $ 69 $ 520
Effective Income Tax Rate Reconciliation, Percent 8.00% 63.00%
Income Tax Examination, Liability (Refund) Adjustment from Settlement with Taxing Authority $ 149  
Change in US Tax Reform [Abstract]    
Tax Cuts and Jobs Act, Change in Tax Rate, Deferred Tax Asset, Income Tax Expense   $ 1,300
Tax Cuts and Jobs Act, Change in Tax Rate, Deferred Tax Liability, Income Tax Benefit   1,800
Tax Cuts and Jobs Act, Accounting Complete [true false] true  
Receivables and other current assets $ 1,620 1,326
Income Tax Reconciliation Revaluation Of US Non Regulated Deferred Income Taxes $ 0 $ 317
Statutory income tax rate 31.00% 31.00%
Deferred tax assets $ 1,886 $ 1,883
Regulated Operation [Member]    
Change in US Tax Reform [Abstract]    
Tax Cuts and Jobs Act, Decrease in Deferred Tax Liability due to Transition Tax   1,100
Unregulated Operation Member    
Change in US Tax Reform [Abstract]    
Income Tax Reconciliation Revaluation Of US Non Regulated Deferred Income Taxes   $ 317