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Financial Instruments And Risk Management (Tables) | 12 Months Ended
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Dec. 31, 2017
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, 2015 |  | (18 | ) | 20 |  | 2 |  |
| Cash Settlements – paid (received) during the year |  | 29 |  | (13 | ) | 16 |  |
| Unrealized losses recognized in earnings during the year (note 9) |  | (47 | ) | (25 | ) | (72 | ) |
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 9) |  | (37 | ) | (19 | ) | (56 | ) |
Fair value outstanding at December 31, 2017 |  | (85 | ) | (20 | ) | (105 | ) |
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 |  | 46 |  | 109 |  | — |  | 155 |  |
| Accounts payable |  | (100 | ) | (109 | ) | — |  | (209 | ) |
Balance at December 31, 2016 |  | (54 | ) | — |  | — |  | (54 | ) |
| Accounts receivable |  | 21 |  | 53 |  | — |  | 74 |  |
| Accounts payable |  | (74 | ) | (105 | ) | — |  | (179 | ) |
Balance at December 31, 2017 |  | (53 | ) | (52 | ) | — |  | (105 | ) |
Summary of offsetting financial assets |
($ millions) |  | Gross Assets |  | Gross Liabilities Offset |  | Net Amounts Presented |
Derivatives |  | 1 765 |  | (1 610 | ) | 155 |
Accounts receivable |  | 2 058 |  | (946 | ) | 1 112 |
Balance at December 31, 2016 |  | 3 823 |  | (2 556 | ) | 1 267 |
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 |
Summary of offsetting financial liabilities |
($ millions) |  | Gross Liabilities |  | Gross Assets Offset |  | Net Amounts Presented |  |
Derivatives |  | (1 819 | ) | 1 610 |  | (209 | ) |
Accounts payable |  | (1 975 | ) | 946 |  | (1 029 | ) |
Balance at December 31, 2016 |  | (3 794 | ) | 2 556 |  | (1 238 | ) |
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 | ) |
Timing of cash outflows related to trade and other payables and debt |
|  | December 31, 2016 |
($ millions) |  | Trade and Other Payables(1) |  | Gross Derivative Liabilities(2) |  | Debt(3) |
Within one year |  | 5 379 |  | 1 819 |  | 2 325 |
1 to 3 years |  | 28 |  | — |  | 5 238 |
3 to 5 years |  | 14 |  | — |  | 3 031 |
Over 5 years |  | 43 |  | — |  | 19 934 |
|  | 5 464 |  | 1 819 |  | 30 528 |
|  | 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 |
(1) | Trade and other payables exclude net derivative liabilities of $179 million (2016 – $209 million)
(2) | Gross derivative liabilities of $1 231 million (2016 – $1 819 million) are offset by gross derivative assets of $1 052 million (2016 – $1 610 million), resulting in a net amount of $179 million (2016 – $209 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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