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ACCOUNTS RECEIVABLE AND OTHER (Details) CAD in Millions, $ in Millions | Sep. 20, 2013 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2015 CAD | Dec. 31, 2014 USD ($) | Dec. 31, 2014 CAD
--- | --- | --- | --- | --- | ---
Accounts receivable and other |  |  |  |  |
Unbilled revenues |  |  | CAD 2,476 |  | CAD 2,218
Trade receivables |  |  | 1,079 |  | 1,168
Taxes receivable |  |  | 175 |  | 522
Regulatory assets |  |  | 216 |  | 567
Short-term portion of derivative assets (Note 24) |  |  | 791 |  | 568
Prepaid expenses and deposits |  |  | 181 |  | 103
Current deferred income taxes (Note 25) |  |  | 367 |  | 245
Dividends receivable |  |  | 26 |  | 26
Other |  |  | 164 |  | 129
Allowance for doubtful accounts |  |  | (45) |  | (42)
Accounts receivable and other |  |  | CAD 5,430 |  | 5,504
Percentage of ownership in SPE, which has access to receivable owned by SPE |  | 100.00% | 100.00% |  |
Special Purpose Entity |  |  |  |  |
Accounts receivable and other |  |  |  |  |
Trade receivables |  | $ 317 | CAD 439 | $ 378 | CAD 439
Special Purpose Entity | Maximum |  |  |  |  |
Accounts receivable and other |  |  |  |  |
Accumulated purchases, net of collections | $ | $ 450 |  |  |  |

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