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Other assets and liabilities (Tables) | 12 Months Ended
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Dec. 31, 2018
Subclassifications of assets, liabilities and equities [abstract] |
Schedule of trade receivables |
| 2018 |  | 2017
| (US$ millions)
Gross trade receivables | 592 |  |  | 597 |
Less: provisions for expected credit losses | (249 | ) |  | (211 | )
Trade receivables, net | 343 |  |  | 386 |
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)
2018: |  |  |  |  |  |  |
Telecom operators | 17 |  |  | 9 |  |  | 14 |  |  | 39 |
Own customers | 158 |  |  | 69 |  |  | 19 |  |  | 246 |
Others | 36 |  |  | 17 |  |  | 5 |  |  | 58 |
Total | 210 |  |  | 95 |  |  | 37 |  |  | 343 |
2017: |  |  |  |  |  |  |
Telecom operators | 29 |  |  | 16 |  |  | 4 |  |  | 49 |
Own customers | 186 |  |  | 52 |  |  | 34 |  |  | 273 |
Others | 43 |  |  | 16 |  |  | 5 |  |  | 64 |
Total | 259 |  |  | 83 |  |  | 43 |  |  | 386 |
Inventories | Inventories
| 2018 |  | 2017
| (US$ millions)
Telephone and equipment | 26 |  |  | 28 |
SIM cards | 4 |  |  | 6 |
IRUs | 3 |  |  | 3 |
Other | 6 |  |  | 9 |
Inventory at December 31, | 39 |  |  | 45 |
Provisions and other liabilities | Current
| 2018 |  | 2017
| (US$ millions)
Deferred revenue(i) | 85 |  |  | 86 |
Customer deposits | 15 |  |  | 13 |
Current legal provisions | 27 |  |  | 24 |
Tax payables | 68 |  |  | 57 |
Customer and MFS distributor cash balances | 147 |  |  | 144 |
Withholding tax on payments to third parties | 17 |  |  | 17 |
Other provisions | 7 |  |  | 1 |
Other current liabilities(ii) | 128 |  |  | 83 |
Total | 494 |  |  | 425 |
(i) | Deferred revenue has partly been reclassified to Contract Liabilities as a result of the adoption of IFRS 15. See the 'Accounting Policy Changes' note.
(ii) | In the caption "Other current liabilities", for 2018 $38 million of provision for tax risk not related to income tax is included.
Non-current
| 2018 |  | 2017
| (US$ millions)
Non-current legal provisions | 8 |  |  | 15 |
Long-term portion of asset retirement obligations | 77 |  |  | 69 |
Long-term portion of deferred income on tower sale and leasebacks | 85 |  |  | 73 |
Long-term employment obligations | 68 |  |  | 76 |
Accruals and payables in respect of spectrum and license acquisitions | 41 |  |  | 31 |
Other non-current liabilities | 71 |  |  | 70 |
Total | 351 |  |  | 335 |
Contract assets | Contract costs, net (i)
| 2018
| (US$ millions)
Net at January 1 | 4 |
Contract costs capitalized | 4 |
Amortization of contract costs | (4 | )
Net at December 31 | 4 |
(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 assets, net
| 2018
| (US$ millions)
Long-term portion | 3 |
Short-term portion | 35 |
Less: provisions for expected credit losses | (1 | )
Total | 37 |
Contract liabilities | Contract liabilities
| 2018
| (US$ millions)
Long-term portion | 1 |
Short-term portion | 86 |
Total | 87 |

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