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RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - NOTIONAL PRINCIPAL OR QUANTITY INFORMATION (Details) MMcf in Thousands, ¥ in Millions, £ in Millions, CAD in Millions, $ in Millions | Dec. 31, 2016 JPY (¥) MWh MMcf MMBbls | Dec. 31, 2016 GBP (£) MWh MMcf MMBbls | Dec. 31, 2016 USD ($) MWh MMcf MMBbls | Dec. 31, 2016 CAD MWh MMcf MMBbls | Dec. 31, 2015 GBP (£) MWh MMcf MMBbls | Dec. 31, 2015 USD ($) MWh MMcf MMBbls | Dec. 31, 2015 CAD MWh MMcf MMBbls
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Foreign exchange contracts - United States dollar or GBP or Japanese yen forwards - purchase |  |  |  |  |  |  |
RISK MANAGEMENT AND FINANCIAL INSTRUMENTS |  |  |  |  |  |  |
2016/2017 |  | £ 91 | $ 991 |  | £ 70 | $ 172 |
2017/2018 |  | 6 | 2 |  | 77 | 413 |
2018/2019 | ¥ 32,662 |  | 2 |  | 6 | 2 |
2019/2020 | $ |  |  | 2 |  |  | 2 |
2020/2021 | $ |  |  |  |  |  | 2 |
Foreign exchange contracts - United States dollar or GBP forwards - sell |  |  |  |  |  |  |
RISK MANAGEMENT AND FINANCIAL INSTRUMENTS |  |  |  |  |  |  |
2016/2017 | $ |  |  | 4,369 |  |  | 3,059 |
2017/2018 | $ |  |  | 2,768 |  |  | 3,213 |
2018/2019 |  | 89 | 2,943 |  |  | 3,133 |
2019/2020 |  | 25 | 2,722 |  | 89 | 2,630 |
2020/2021 |  | 27 | 566 |  | 25 | 2,303 |
Thereafter |  | £ 144 | $ 223 |  | £ 144 | $ 787 |
Interest rate contracts - short-term borrowings |  |  |  |  |  |  |
RISK MANAGEMENT AND FINANCIAL INSTRUMENTS |  |  |  |  |  |  |
2016/2017 |  |  |  | CAD 6,713 |  |  | CAD 8,382
2017/2018 |  |  |  | 5,161 |  |  | 7,604
2018/2019 |  |  |  | 1,581 |  |  | 4,536
2019/2020 |  |  |  | 153 |  |  | 1,574
2020/2021 |  |  |  | 100 |  |  | 156
Thereafter |  |  |  | 300 |  |  | 406
Interest rate contracts - long-term debt |  |  |  |  |  |  |
RISK MANAGEMENT AND FINANCIAL INSTRUMENTS |  |  |  |  |  |  |
2016/2017 |  |  |  | 3,998 |  |  | 4,291
2017/2018 |  |  |  | 2,743 |  |  | 3,371
2018/2019 |  |  |  | 768 |  |  | 1,960
2019/2020 |  |  |  |  |  |  | 773
Equity contracts |  |  |  |  |  |  |
RISK MANAGEMENT AND FINANCIAL INSTRUMENTS |  |  |  |  |  |  |
2016/2017 |  |  |  | 48 |  |  | 51
2017/2018 |  |  |  | CAD 40 |  |  | CAD 48
Commodity contracts | Natural gas |  |  |  |  |  |  |
RISK MANAGEMENT AND FINANCIAL INSTRUMENTS |  |  |  |  |  |  |
2016/2017 | MMcf | (93) | (93) | (93) | (93) | (126) | (126) | (126)
2017/2018 | MMcf | (42) | (42) | (42) | (42) | (209) | (209) | (209)
2018/2019 | MMcf | (17) | (17) | (17) | (17) | (17) | (17) | (17)
2019/2020 | MMcf | (9) | (9) | (9) | (9) | 2 | 2 | 2
2020/2021 | MMcf |  |  |  |  | 1 | 1 | 1
Commodity contracts | Crude oil |  |  |  |  |  |  |
RISK MANAGEMENT AND FINANCIAL INSTRUMENTS |  |  |  |  |  |  |
2016/2017 | MMBbls | (11) | (11) | (11) | (11) | (6) | (6) | (6)
2017/2018 | MMBbls | (9) | (9) | (9) | (9) | (17) | (17) | (17)
2018/2019 | MMBbls |  |  |  |  | (9) | (9) | (9)
Commodity contracts | NGL |  |  |  |  |  |  |
RISK MANAGEMENT AND FINANCIAL INSTRUMENTS |  |  |  |  |  |  |
2016/2017 | MMBbls | (8) | (8) | (8) | (8) | (5) | (5) | (5)
2017/2018 | MMBbls | (6) | (6) | (6) | (6) | 1 | 1 | 1
Commodity contracts | Power |  |  |  |  |  |  |
RISK MANAGEMENT AND FINANCIAL INSTRUMENTS |  |  |  |  |  |  |
2016/2017 | MWh | 40 | 40 | 40 | 40 | 40 | 40 | 40
2017/2018 | MWh | 30 | 30 | 30 | 30 | 40 | 40 | 40
2018/2019 | MWh | 31 | 31 | 31 | 31 | 30 | 30 | 30
2019/2020 | MWh | 35 | 35 | 35 | 35 | 31 | 31 | 31
2020/2021 | MWh | (3) | (3) | (3) | (3) | 35 | 35 | 35
Thereafter | MWh | (43) | (43) | (43) | (43) | (35) | (35) | (35)

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