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Capital Structure Financial Policies - (Tables) | 12 Months Ended
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Dec. 31, 2017
CAPITAL STRUCTURE FINANCIAL POLICIES |
Schedule of components of ratios |
($ millions) |  | Capital Measure Target |  | December 31, 2017 |  | December 31, 2016 |
Components of ratios |  |  |  |  |  |  |
| Short-term debt |  |  |  | 2 136 |  | 1 273 |
| Current portion of long-term debt |  |  |  | 71 |  | 54 |
| Long-term debt |  |  |  | 13 372 |  | 16 103 |
|  | Total debt |  |  |  | 15 579 |  | 17 430 |
| Less: Cash and cash equivalents |  |  |  | 2 672 |  | 3 016 |
|  | Net debt |  |  |  | 12 907 |  | 14 414 |
| Shareholders' equity |  |  |  | 45 383 |  | 44 630 |
| Total capitalization (total debt plus shareholders' equity) |  |  |  | 60 962 |  | 62 060 |
| Funds from operations(1) |  |  |  | 9 139 |  | 5 988 |
Net debt to funds from operations |  | <3.0 times |  | 1.4 |  | 2.4 |
Total debt to total debt plus shareholders' equity |  |  |  | 26% |  | 28% |
(1) | Funds from operations is calculated as cash flow from operating activities before changes in non-cash working capital, and is a non-GAAP financial measure.

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