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other long-term assets (Tables) | 12 Months Ended
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Dec. 31, 2020
other long-term assets |
Schedule of other long-term assets |
As at December 31 (millions) |  | Note |  | 2020 |  | 2019
Pension assets |  | 15(b) |  | $ | 13 |  | $ | 155
Unbilled customer finance receivables |  | 4(b) |  |  | 361 |  |  | 225
Derivative assets |  | 4(h) |  |  | 40 |  |  | 76
Costs incurred to obtain or fulfill a contract with a customer |  |  |  |  | 103 |  |  | 109
Real estate joint venture advances |  | 21(b) |  |  | 114 |  |  | 104
Investment in real estate joint venture |  | 21(b) |  |  | 1 |  |  | 3
Investment in associate |  | 21 |  |  | 69 |  |  | —
Portfolio investments 1 |  |  |  |  | 236 |  |  | 110
Prepaid maintenance |  |  |  |  | 50 |  |  | 55
Other |  |  |  |  | 119 |  |  | 82
|  |  |  | $ | 1,106 |  | $ | 919
| 1 |  | Fair value measured at reporting date using significant other observable inputs (Level 2).
Schedule of costs incurred to obtain and fulfill contracts with customers |
Years ended December 31 (millions) |  | 2020 |  | 2019
|  | Costs incurred to |  |  |  |  | Costs incurred to |  |  |
|  | Obtain |  |  |  |  |  |  | Obtain |  |  |  |  |
|  | contracts with |  | Fulfill contracts |  |  |  |  | contracts with |  | Fulfill contracts |  |  |
|  | customers |  | with customers |  | Total |  | customers |  | with customers |  | Total
Balance, beginning of period |  | $ | 344 |  | $ | 14 |  | $ | 358 |  | $ | 356 |  | $ | 15 |  | $ | 371
Additions |  |  | 261 |  |  | 4 |  |  | 265 |  |  | 288 |  |  | 4 |  |  | 292
Amortization |  |  | (282) |  |  | (7) |  |  | (289) |  |  | (300) |  |  | (5) |  |  | (305)
Balance, end of period |  | $ | 323 |  | $ | 11 |  | $ | 334 |  | $ | 344 |  | $ | 14 |  | $ | 358
Current 1 |  | $ | 225 |  | $ | 6 |  | $ | 231 |  | $ | 243 |  | $ | 6 |  | $ | 249
Non-current |  |  | 98 |  |  | 5 |  |  | 103 |  |  | 101 |  |  | 8 |  |  | 109
|  | $ | 323 |  | $ | 11 |  | $ | 334 |  | $ | 344 |  | $ | 14 |  | $ | 358
| 1 |  | Presented in the Consolidated statements of financial position in prepaid expenses.

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- Definition The disclosure of assets recognised from the costs to obtain or fulfill contracts with customers. + References No definition available. + Details
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- Definition The tabular disclosure of detailed information about the components of other long-term assets. + References No definition available. + Details
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