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Supplemental Cash Flow Information (Tables) | 12 Months Ended
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Dec. 31, 2017
Supplemental Cash Flow Information |
Schedule of supplemental cash flow information | The decrease (increase) in non-cash working capital is comprised of:
($ millions) |  | 2017 |  | 2016 |  |
Accounts receivable |  | (79 | ) | (471 | ) |
Inventories |  | (268 | ) | (218 | ) |
Accounts payable and accrued liabilities |  | 68 |  | 110 |  |
Current portion of provisions |  | (48 | ) | (98 | ) |
Income taxes payable (net) |  | 421 |  | 145 |  |
|  | 94 |  | (532 | ) |
Relating to: |  |  |  |  |  |
| Operating activities |  | (173 | ) | (308 | ) |
| Investing activities |  | 267 |  | (224 | ) |
|  | 94 |  | (532 | ) |
Reconciliation of movements of liabilities to cash flows arising from financing activities:
($ millions) |  | Short-Term Debt |  | Current Portion of Long-Term Debt |  | Long-Term Debt |  | Partnership Liability |  | Dividends Payable |  | Derivative Liabilities (Assets)(1) |  |
At December 31, 2016 |  | 1 273 |  | 54 |  | 16 103 |  | — |  | — |  | 17 |  |
Changes from financing cash flows: |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Net issuance of commercial paper |  | 1 065 |  | — |  | — |  | — |  | — |  | — |  |
| Gross proceeds from issuance of long-term debt |  | — |  | — |  | 955 |  | — |  | — |  | — |  |
| Debt issuance costs |  | — |  | — |  | (13 | ) | — |  | — |  | — |  |
| Repayment of long-term debt |  | — |  | — |  | (2 561 | ) | — |  | — |  | — |  |
| Realized foreign exchange gain |  | (84 | ) | — |  | (612 | ) | — |  | — |  | — |  |
| Dividends paid on common shares |  | — |  | — |  | — |  | — |  | (2 124 | ) | — |  |
| Payments of finance lease liabilities |  | — |  | — |  | (58 | ) | — |  | — |  | — |  |
| Net settlement of derivatives |  | — |  | — |  | — |  | — |  | — |  | 25 |  |
| Proceeds from sale of non-controlling interest |  | — |  | — |  | — |  | 503 |  | — |  | — |  |
| Distributions to non-controlling interest |  | — |  | — |  | — |  | (20 | ) | — |  |  |  |
Non-cash changes: |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Dividends declared on common shares |  | — |  | — |  | — |  | — |  | 2 124 |  | — |  |
| Unrealized foreign exchange gain |  | (118 | ) | — |  | (653 | ) | — |  | — |  | — |  |
| Deferred financing costs |  | — |  | — |  | (14 | ) | — |  | — |  | — |  |
| New finance lease liabilities |  | — |  | — |  | 628 |  | — |  | — |  | — |  |
| Unrealized fair value gain recognized in net earnings |  | — |  | — |  | — |  | — |  | — |  | (42 | ) |
| Reclassification from long-term debt to current portion of long-term debt |  | — |  | 17 |  | (17 | ) | — |  | — |  | — |  |
| Reclassification from a finance lease to a service arrangement(2) |  | — |  | — |  | (386 | ) | — |  | — |  | — |  |
At December 31, 2017 |  | 2 136 |  | 71 |  | 13 372 |  | 483 |  | — |  | — |  |
(1) | Derivative liabilities (assets) relate to foreign exchange forward contracts and interest rate swaps the company may utilize for risk management purposes in relation to U.S. dollar denominated long-term debt.
(2) | Service agreements are recorded in Operating, Selling and General expense as incurred.

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