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Derivative Instruments (Tables)
 12 Months Ended
Dec. 31, 2018
Derivative Instruments [Abstract]  
Schedule of Derivative Instruments [Table Text Block]
Derivative assets and liabilities relating to the foregoing categories consisted of the following:
Derivative AssetsDerivative Liabilities
As atDecember 31December 31December 31December 31
millions of Canadian dollars2018201720182017
Cash flow hedges
Power swaps$ - $ 5$ - $ 2
Foreign exchange forwards - 2 5 5
- 7 5 7
Regulatory deferral
Commodity swaps and forwards
Coal purchases 71 137 1 10
Power purchases 2 5 1 3
Natural gas purchases and sales 2 6 4 7
Heavy fuel oil purchases 1 15 1 4
Foreign exchange forwards 29 32 - 4
105 195 7 28
HFT derivatives
Power swaps and physical contracts 62 125 76 162
Natural gas swaps, futures, forwards, physical contracts 125 105 403 294
187 230 479 456
Other derivatives
Interest rate swap 1 2 - -
1 2 - -
Total gross current derivatives 293 434 491 491
Impact of master netting agreements with intent to settle net or simultaneously (126) (181) (126) (181)
167 253 365 310
Current 148 141 260 227
Long-term 19 112 105 83
Total derivatives$ 167$ 253$ 365$ 310
Derivative assets and liabilities are classified as current or long-term based upon the maturities of the underlying contracts.
Offsetting Liabilities [Table Text Block]
Details of master netting agreements, shown net on the Consolidated Balance Sheets, are summarized in the following table:
Derivative AssetsDerivative Liabilities
As atDecember 31December 31December 31December 31
millions of Canadian dollars2018201720182017
Regulatory deferral$ 1$ 14$ 1$ 14
HFT derivatives 125 167 125 167
Total impact of master netting agreements withintent to settle net or simultaneously$ 126$ 181$ 126$ 181
Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss) [Table Text Block]
For theYear ended December 31
millions of Canadian dollars20182017
InterestForeignInterestForeign
PowerrateexchangePowerrateexchange
swapsswapsforwardsswapsswapsforwards
Realized gain (loss) in non-regulated fuel for generation and purchased power 1 - - 3 - -
Realized gain (loss) in operating revenue – regulated - - 5 - - (10)
Total gains (losses) in Net income$ 1$ - $ 5$ 3$ - $ (10)
As at December 31
millions of Canadian dollars20182017
InterestForeignInterestForeign
PowerrateexchangePowerrateexchange
swapsswapsforwardsswapsswapsforwards
Total unrealized gain (loss) in AOCI – effective portion, net of tax$ (1)$ - $ (6)$ - $ - $ (3)
The Company expects $4 million of unrealized losses currently in AOCI to be reclassified into net income within the next twelve months, as the underlying hedged transactions settle.

As at December 31, 2018, the Company had the following notional volumes of outstanding derivatives designated as cash flow hedges that are expected to settle as outlined below:
millions201920202021
Foreign exchange forwards (USD) sales$ 30$ 30$ -
Schedule Of Regulatory Deferred Gain Losses Derivatives [Table Text Block]
For theYear ended December 31
millions of Canadian dollars20182017
Commodity swaps and forwardsPhysical natural gas purchases and salesForeign exchange forwardsCommodity swaps and forwardsPhysical natural gas purchases and salesForeign exchange forwards
Unrealized gain (loss) in regulatory assets$ (34)$ - $ 4$ (33)$ (1)$ (4)
Unrealized gain (loss) in regulatory liabilities 29 - 24 83 1 (30)
Realized (gain) loss in regulatory liabilities (8) - - (2) - -
Realized (gain) loss in inventory (1) (55) - (18) (17) - (30)
Realized (gain) loss in regulated fuel for generation and purchased power (2) (2) - (9) (3) - (14)
Total change derivative instruments$ (70)$ - $ 1$ 28$ - $ (78)
(1) Realized (gains) losses will be recognized in fuel for generation and purchased power when the hedged item is consumed.
(2) Realized (gains) losses on derivative instruments settled and consumed in the period; hedging relationships that have been terminated or the hedged transaction is no longer probable.
Schedule Of Regulatory Commody Swaps Forwards [Table Text Block]
20192020-2023
millions PurchasesPurchases
Coal (metric tonnes) 1 1
Natural Gas (Mmbtu) 16 -
Heavy fuel oil (bbls) - 1

20192020
Foreign exchange contracts (millions of US dollars)$ 121$ 111
Weighted average rate 1.1621 1.3027
% of USD requirements66%48%
The Company reassesses foreign exchange forecasted periodically and will enter into additional hedges or unwind existing hedges, as required.
Unrealized Gain (Loss) on Investments [Table Text Block]
For the Year ended December 31
millions of Canadian dollars20182017
Power swaps and physical contracts in non-regulated operating revenues$ (12)$ 7
Natural gas swaps, forwards, futures and physical contracts in non-regulated operating revenues 205 401
Natural gas swaps, forwards, futures and physical contracts in non-regulated fuel for generation and purchased power - 10
Power swaps, forwards, futures and physical contracts in non-regulated fuel for generation and purchased power 2 2
$ 195$ 420
Offsetting Liabilities Expected To Settle [Table Text Block]
millions 20192020202120222023
Natural gas purchases (Mmbtu) 308 108 71 50 41
Natural gas sales (Mmbtu) 247 42 9 2 -
Power purchases (MWh) 6 - - - -
Power sales (MWh) 5 - - - -
Derivative Documentation Unmet [Table Text Block]
Other Derivatives
For theYear ended December 31
millions of Canadian dollars20182017
Interest rateInterest rate
swapsswaps
Unrealized gain (loss) in interest expense, net (1) 2
Total gains (losses) in net income$ (1)$ 2
As at December 31, 2018, the Company had interest rate swaps in place for the $250 million non-revolving term credit facility in Brunswick Pipeline for interest payments through Q1 2019.
Schedules of Concentration of Risk, by Risk Factor [Table Text Block]
Concentration Risk
The Company's concentrations of risk consisted of the following:
As atDecember 31, 2018December 31, 2017
millions of Canadian dollars% of total exposuremillions of Canadian dollars% of total exposure
Receivables, net
Regulated utilities
Residential$ 38428%$ 32623%
Commercial 18213% 16111%
Industrial 574% 463%
Other 846% 967%
70751% 62944%
Trading group
Credit rating of A- or above 494% 554%
Credit rating of BBB- to BBB+ 705% 614%
Credit rating of CCC- to CCC+ 80% - 0%
Not rated 1088% 967%
23517% 21215%
Other accounts receivable 27320% 30022%
1,21588% 1,14181%
Derivative Instruments (current and long-term)
Credit rating of A- or above 1309% 20715%
Credit rating of BBB- to BBB+ 91% 101%
Not rated 282% 363%
16712% 25319%
$ 1,382100%$ 1,394100%
Schedule of Financial Instruments Owned and Pledged as Collateral [Table Text Block]
As atDecember 31December 31
millions of Canadian dollars20182017
Cash collateral provided to others$ 103$ 119
Cash collateral received from others 77 99