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Other assets and liabilities (Tables)
 12 Months Ended
Dec. 31, 2020
Subclassifications of assets, liabilities and equities [abstract]  
Schedule of trade receivables
20202019
(US$ millions)
Gross trade receivables649 636 
Less: provisions for expected credit losses(298)(265)
Trade receivables, net351 371 
Aging of trade receivables
Aging of trade receivables
Neither past due nor impairedPast due (net of impairments)
30–90 days>90 daysTotal
(US$ millions)
2020:
Telecom operators15 7 3 25 
Own customers167 65 34 266 
Others34 19 8 60 
Total
216 90 45 351 
2019:
Telecom operators23 9 8 40 
Own customers177 63 29 270 
Others40 15 5 60 
Total
241 88 43 371 
Inventories
Inventories
20202019
(US$ millions)
Telephone and equipment23 18 
SIM cards4 3 
IRUs— 3 
Other10 9 
Inventory at December 31,37 32 
Provisions and other liabilities
Current
20202019
(US$ millions)
Deferred revenue78 77 
Customer deposits14 14 
Current legal provisions22 36 
Tax payables72 74 
Customer and MFS distributor cash balances186 141 
Withholding tax on payments to third parties6 15 
Other provisions— 3 
Other current liabilities(i)133 113 
Total511 474 
(i) Includes $44 million (2019: $38 million) of tax risk liabilities not related to income tax.
Non-current
20202019
(US$ millions)
Non-current legal provisions30 18 
Long-term portion of asset retirement obligations107 96 
Long-term portion of deferred income on tower sale and leasebacks recognized under IAS 1757 68 
Long-term employment obligations67 71 
Other non-current liabilities67 68 
Total328 322 
Contract assets
Contract assets, net
20202019
(US$ millions)
Long-term portion6 6 
Short-term portion28 37 
Less: provisions for expected credit losses(2)(2)
Total31 41 
Contract costs, net (i)
20202019
(US$ millions)
Net at January 15 4 
Contract costs capitalized1 7 
Amortization of contract costs(1)(6)
Net at December 315 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
20202019
(US$ millions)
Long-term portion2 1 
Short-term portion89 81 
Total90 82