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advance billings and customer deposits | 12 Months Ended
--- | ---
Dec. 31, 2018
advance billings and customer deposits |
advance billings and customer deposits | 24 advance billings and customer deposits
|  | December 31, |  | December 31, |  | January 1,
As at (millions) |  | 2018 |  | 2017 |  | 2017
|  |  |  |  | (adjusted – |  |
|  |  |  |  | Note 2(c)) |  | (Note 2(c))
Advance billings |  | $ | 535 |  | $ | 506 |  | $ | 456
Deferred customer activation and connection fees |  |  | 10 |  |  | 13 |  |  | 17
Customer deposits |  |  | 13 |  |  | 21 |  |  | 15
Regulatory deferral accounts |  |  | — |  |  | 1 |  |  | 8
Contract liabilities |  |  | 558 |  |  | 541 |  |  | 496
Other |  |  | 95 |  |  | 91 |  |  | 88
|  | $ | 653 |  | $ | 632 |  | $ | 584
Contract liabilities represent our future performance obligations to customers in respect of services and/or equipment and for which we have received consideration from the customer or for which an amount is due from the customer. Our contract liability balances, and the changes in those balances, are set out in the following table:
Years ended December 31 (millions) |  | Note |  | 2018 |  | 2017
Balance, beginning of period |  |  |  | $ | 780 |  | $ | 732
Revenue deferred in previous period and recognized in current period |  |  |  |  | (689) |  |  | (670)
Net additions arising from operations |  |  |  |  | 708 |  |  | 718
Regulatory deferral account drawdown |  |  |  |  | — |  |  | (7)
Additions arising from business combinations |  | 18(b) |  |  | 9 |  |  | 7
Balance, end of period |  |  |  | $ | 808 |  | $ | 780
Current |  |  |  | $ | 715 |  | $ | 691
Non-current |  | 27 |  |  |  |  |  |
Deferred revenues |  |  |  |  | 78 |  |  | 71
Deferred customer activation and connection fees |  |  |  |  | 15 |  |  | 18
|  |  |  | $ | 808 |  | $ | 780
Reconciliation of contract liabilities presented in the consolidated statements of financial position – current |  |  |  |  |  |  |  |
Gross contract liabilities |  |  |  | $ | 715 |  | $ | 691
Reclassification to contract assets for contracts with contract liabilities less than contract assets |  |  |  |  | (154) |  |  | (146)
Reclassification from contract assets for contracts with contract assets less than contract liabilities |  |  |  |  | (3) |  |  | (4)
|  |  |  | $ | 558 |  | $ | 541

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- Definition The disclosure of deposits from customers. [Refer: Deposits from customers] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 10 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_10_e&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition n/a + References No definition available. + Details
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