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ACCOUNTS RECEIVABLE AND OTHER (Details) CAD in Millions, $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2016 USD ($) | Dec. 31, 2016 CAD | Dec. 31, 2015 USD ($) | Dec. 31, 2015 CAD
Accounts receivable and other |  |  |  |
Unbilled revenues |  | CAD 2,886 |  | CAD 2,476
Trade receivables |  | 974 |  | 1,079
Taxes receivable |  | 222 |  | 175
Regulatory assets |  | 66 |  | 216
Short-term portion of derivative assets (Note 24) |  | 353 |  | 791
Prepaid expenses and deposits |  | 168 |  | 181
Current deferred income taxes (Note 25) |  |  |  | 367
Dividends receivable |  | 26 |  | 26
Rebillable receivables |  | 63 |  |
Agent billing and collection receivable |  | 35 |  | 39
Other |  | 231 |  | 125
Allowance for doubtful accounts |  | (46) |  | (45)
Accounts receivable and other |  | 4,978 |  | 5,430
Special Purpose Entity |  |  |  |
Accounts receivable and other |  |  |  |
Trade receivables | $ 355 | CAD 477 | $ 317 | CAD 439
Percentage of ownership in SPE, which has access to receivable owned by SPE | 100.00% | 100.00% |  |
Special Purpose Entity | Maximum |  |  |  |
Accounts receivable and other |  |  |  |
Accumulated purchases, net of collections | $ | $ 450 |  |  |

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- Definition Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are expected to be recovered through revenue sources within one year or the normal operating cycle, if longer. Such costs are capitalized if they meet both of the following criteria: a. It is probable that future revenue in an amount at least equal to the capitalized cost will result from inclusion of that cost in allowable costs for rate-making purposes. b. Based on available evidence, the future revenue will be provided to permit recovery of the previously incurred cost rather than to provide for expected levels of similar future costs. If the revenue will be provided through an automatic rate-adjustment clause, this criterion requires that the regulator's intent clearly be to permit recovery of the previously incurred cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382 + Details
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