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Financial Instruments And Risk Management (Tables) | 12 Months Ended
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Dec. 31, 2018
FINANCIAL INSTRUMENTS AND RISK MANAGEMENT |
Summary of changes in the fair value of non designated Energy Trading and Risk Management derivatives |
($ millions) |  | Energy Trading |  | Risk Management |  | Total |  |
Fair value outstanding at December 31, 2016 |  | (36 | ) | (18 | ) | (54 | ) |
| Cash Settlements – (received) paid during the year |  | (12 | ) | 17 |  | 5 |  |
| Unrealized losses recognized in earnings during the year (note 7) |  | (37 | ) | (19 | ) | (56 | ) |
Fair value outstanding at December 31, 2017 |  | (85 | ) | (20 | ) | (105 | ) |
| Cash Settlements – received during the year |  | (43 | ) | (47 | ) | (90 | ) |
| Unrealized gains recognized in earnings during the year (note 7) |  | 129 |  | 126 |  | 255 |  |
Fair value outstanding at December 31, 2018 |  | 1 |  | 59 |  | 60 |  |
Summary of derivative financial instrument assets and liabilities and assets available for sale measured at fair value |
($ millions) |  | Level 1 |  | Level 2 |  | Level 3 |  | Total Fair Value |  |
| Accounts receivable |  | 21 |  | 53 |  | — |  | 74 |  |
| Accounts payable |  | (74 | ) | (105 | ) | — |  | (179 | ) |
Balance at December 31, 2017 |  | (53 | ) | (52 | ) | — |  | (105 | ) |
| Accounts receivable |  | 63 |  | 152 |  | — |  | 215 |  |
| Accounts payable |  | (43 | ) | (112 | ) | — |  | (155 | ) |
Balance at December 31, 2018 |  | 20 |  | 40 |  | — |  | 60 |  |
Summary of offsetting financial assets |
($ millions) |  | Gross Assets |  | Gross Liabilities Offset |  | Net Amounts Presented |
Derivatives |  | 1 126 |  | (1 052 | ) | 74 |
Accounts receivable |  | 2 405 |  | (1 252 | ) | 1 153 |
Balance at December 31, 2017 |  | 3 531 |  | (2 304 | ) | 1 227 |
Derivatives |  | 1 599 |  | (1 384 | ) | 215 |
Accounts receivable |  | 1 837 |  | (882 | ) | 955 |
Balance at December 31, 2018 |  | 3 436 |  | (2 266 | ) | 1 170 |
Summary of offsetting financial liabilities |
($ millions) |  | Gross Liabilities |  | Gross Assets Offset |  | Net Amounts Presented |  |
Derivatives |  | (1 231 | ) | 1 052 |  | (179 | ) |
Accounts payable |  | (2 270 | ) | 1 252 |  | (1 018 | ) |
Balance at December 31, 2017 |  | (3 501 | ) | 2 304 |  | (1 197 | ) |
Derivatives |  | (1 539 | ) | 1 384 |  | (155 | ) |
Accounts payable |  | (1 798 | ) | 882 |  | (916 | ) |
Balance at December 31, 2018 |  | (3 337 | ) | 2 266 |  | (1 071 | ) |
Timing of cash outflows related to trade and other payables and debt |
|  | December 31, 2017 |
($ millions) |  | Trade and Other Payables(1) |  | Gross Derivative Liabilities(2) |  | Debt(3) |
Within one year |  | 6 024 |  | 1 231 |  | 3 027 |
1 to 3 years |  | 38 |  | — |  | 1 949 |
3 to 5 years |  | 38 |  | — |  | 3 184 |
Over 5 years |  | — |  | — |  | 20 160 |
|  | 6 100 |  | 1 231 |  | 28 320 |
|  | December 31, 2018 |
($ millions) |  | Trade and Other Payables(1) |  | Gross Derivative Liabilities(2) |  | Debt(3) |
Within one year |  | 5 492 |  | 1 539 |  | 4 314 |
1 to 3 years |  | 42 |  | — |  | 3 362 |
3 to 5 years |  | 42 |  | — |  | 1 827 |
Over 5 years |  | — |  | — |  | 20 611 |
|  | 5 576 |  | 1 539 |  | 30 114 |
(1) Trade and other payables exclude net derivative liabilities of $155 million (2017 – $179 million). (2) Gross derivative liabilities of $1 539 million (2017 – $1 231 million) are offset by gross derivative assets of $1 384 million (2017 – $1 052 million), resulting in a net amount of $155 million (2017 – $179 million). (3) Debt includes short-term debt, long-term debt, finance leases and interest payments on fixed-term debt and commercial paper.

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