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Other assets and liabilities (Tables) | 12 Months Ended
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Dec. 31, 2020
Subclassifications of assets, liabilities and equities [abstract] |
Schedule of trade receivables |
| 2020 | 2019
| (US$ millions)
Gross trade receivables | 649 |  | 636 |
Less: provisions for expected credit losses | (298) |  | (265) |
Trade receivables, net | 351 |  | 371 |
Aging of trade receivables | Aging of trade receivables
| Neither past due nor impaired | Past due (net of impairments) |
30–90 days | >90 days | Total
| (US$ millions)
2020: |  |  |  |
Telecom operators | 15 |  | 7 |  | 3 |  | 25 |
Own customers | 167 |  | 65 |  | 34 |  | 266 |
Others | 34 |  | 19 |  | 8 |  | 60 |
Total | 216 |  | 90 |  | 45 |  | 351 |
2019: |  |  |  |
Telecom operators | 23 |  | 9 |  | 8 |  | 40 |
Own customers | 177 |  | 63 |  | 29 |  | 270 |
Others | 40 |  | 15 |  | 5 |  | 60 |
Total | 241 |  | 88 |  | 43 |  | 371 |
Inventories | Inventories
| 2020 | 2019
| (US$ millions)
Telephone and equipment | 23 |  | 18 |
SIM cards | 4 |  | 3 |
IRUs | — |  | 3 |
Other | 10 |  | 9 |
Inventory at December 31, | 37 |  | 32 |
Provisions and other liabilities | Current
| 2020 | 2019
| (US$ millions)
Deferred revenue | 78 |  | 77 |
Customer deposits | 14 |  | 14 |
Current legal provisions | 22 |  | 36 |
Tax payables | 72 |  | 74 |
Customer and MFS distributor cash balances | 186 |  | 141 |
Withholding tax on payments to third parties | 6 |  | 15 |
Other provisions | — |  | 3 |
Other current liabilities(i) | 133 |  | 113 |
Total | 511 |  | 474 |
(i) Includes $44 million (2019: $38 million) of tax risk liabilities not related to income tax. Non-current
| 2020 | 2019
| (US$ millions)
Non-current legal provisions | 30 |  | 18 |
Long-term portion of asset retirement obligations | 107 |  | 96 |
Long-term portion of deferred income on tower sale and leasebacks recognized under IAS 17 | 57 |  | 68 |
Long-term employment obligations | 67 |  | 71 |
Other non-current liabilities | 67 |  | 68 |
Total | 328 |  | 322 |
Contract assets | Contract assets, net
| 2020 | 2019
| (US$ millions)
Long-term portion | 6 |  | 6 |
Short-term portion | 28 |  | 37 |
Less: provisions for expected credit losses | (2) |  | (2) |
Total | 31 |  | 41 |
Contract costs, net (i)
| 2020 | 2019
| (US$ millions)
Net at January 1 | 5 |  | 4 |
Contract costs capitalized | 1 |  | 7 |
Amortization of contract costs | (1) |  | (6) |
Net at December 31 | 5 |  | 5 |
(i) Incremental costs of obtaining a contract are expensed when incurred if the amortization period of the asset that Millicom otherwise would have recognized is one year or less.
Contract liabilities | Contract liabilities
| 2020 | 2019
| (US$ millions)
Long-term portion | 2 |  | 1 |
Short-term portion | 89 |  | 81 |
Total | 90 |  | 82 |

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