v3.19.2

other long-term assets | 6 Months Ended
--- | ---
Jun. 30, 2019
other long-term assets |
other long-term assets | 20 other long-term assets
|  |  |  | June 30, |  | December 31,
As at (millions) |  | Note |  | 2019 |  | 2018
Pension assets |  |  |  | $ | 503 |  | $ | 503
Costs incurred to obtain or fulfill a contract with a customer |  |  |  |  | 105 |  |  | 110
Portfolio investments 1 |  |  |  |  | 70 |  |  | 70
Prepaid maintenance |  |  |  |  | 45 |  |  | 55
Real estate joint venture advances |  | 21(c ) |  |  | 86 |  |  | 69
Real estate joint ventures |  | 21(c ) |  |  | 5 |  |  | 5
Derivative assets |  | 4(d ) |  |  | 2 |  |  | 54
Other |  |  |  |  | 103 |  |  | 120
|  |  |  | $ | 919 |  | $ | 986
| (1) |  | Fair value measured at reporting date using significant other observable inputs (Level 2).
The costs incurred to obtain and fulfill contracts with customers are set out in the following table:
|  | Three months |  | Six months
|  | Costs incurred to |  |  |  |  | Costs incurred to |  |  |
|  | Obtain |  |  |  |  |  |  | Obtain |  |  |  |  |
|  | contracts with |  | Fulfill contracts |  |  |  |  | contracts with |  | Fulfill contracts |  |  |
Periods ended June 30, 2019 (millions) |  | customers |  | with customers |  | Total |  | customers |  | with customers |  | Total
Balance, beginning of period |  | $ | 342 |  | $ | 15 |  | $ | 357 |  | $ | 356 | $ |  | 15 |  | $ | 371
Additions |  |  | 70 |  |  | 1 |  |  | 71 |  |  | 131 |  |  | 2 |  |  | 133
Amortization |  |  | (75) |  |  | (1) |  |  | (76) |  |  | (150) |  |  | (2) |  |  | (152)
Balance, end of period |  | $ | 337 |  | $ | 15 |  | $ | 352 |  | $ | 337 |  | $ | 15 |  | $ | 352
Current 1 |  |  | — |  |  | — |  |  | — |  | $ | 242 |  | $ | 5 |  | $ | 247
Non-current |  |  | — |  |  | — |  |  | — |  |  | 95 |  |  | 10 |  |  | 105
|  |  | — |  |  | — |  |  | — |  | $ | 337 |  | $ | 15 |  | $ | 352
| (1) |  | Presented on the Consolidated statements of financial position in prepaid expenses.

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- Definition The entire disclosure for other long-term assets. + References No definition available. + Details
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- Definition n/a + References No definition available. + Details
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