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advance billings and customer deposits (Tables) | 12 Months Ended
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Dec. 31, 2018
advance billings and customer deposits |
Disclosure of advance billings and customer accounts |
|  | 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
Schedule of changes in contract liabilities |
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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