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Capital structure and financing - C.3. Debt and financing (Details)
$ in Millions, $ in Millions
Dec. 31, 2018
USD ($)
Jul. 31, 2018
USD ($)
Jul. 31, 2018
COP ($)
Dec. 31, 2017
USD ($)
Disclosure of detailed information about borrowings [line items]        
Total non-current financing $ 4,291     $ 3,742
Less: portion payable within one year (168)     (142)
Debt and financing – non-current 4,123     3,600 [1]
Total non-current financing due after more than one year 289     43
Debt and financing – current 458     185 [1]
Borrowings 4,580     3,785
Millicom International Cellular S.A. (Luxembourg)        
Disclosure of detailed information about borrowings [line items]        
Borrowings 1,770     1,255
Colombia        
Disclosure of detailed information about borrowings [line items]        
Borrowings 1,016     1,130
Paraguay        
Disclosure of detailed information about borrowings [line items]        
Borrowings 504     488
Bolivia        
Disclosure of detailed information about borrowings [line items]        
Borrowings 317     352
Panama        
Disclosure of detailed information about borrowings [line items]        
Borrowings 261     0
Tanzania (excluding Zantel)        
Disclosure of detailed information about borrowings [line items]        
Borrowings 201     217
Rwanda        
Disclosure of detailed information about borrowings [line items]        
Borrowings 0     50
Chad        
Disclosure of detailed information about borrowings [line items]        
Borrowings 64     70
Costa Rica        
Disclosure of detailed information about borrowings [line items]        
Borrowings 148     76
El Salvador        
Disclosure of detailed information about borrowings [line items]        
Borrowings 299     147
Bilateral Facility With IIC [Member]        
Disclosure of detailed information about borrowings [line items]        
Borrowings face amount   $ 50 $ 144,054.5  
Borrowings, interest rate   9.45% 9.45%  
Bonds        
Disclosure of detailed information about borrowings [line items]        
Total non-current financing 2,501     2,147
Total non-current financing due after more than one year 0     0
Banks        
Disclosure of detailed information about borrowings [line items]        
Total non-current financing 1,324     1,158
Total non-current financing due after more than one year 289     40
Finance lease liabilities        
Disclosure of detailed information about borrowings [line items]        
Total non-current financing 353     362
Total non-current financing due after more than one year 0     3
Other Borrowings        
Disclosure of detailed information about borrowings [line items]        
Total non-current financing 113     74
Total non-current financing due after more than one year $ 0     $ 0
[1] Not restated for the application of IFRS 15 and 9, as the Group elected the modified retrospective approach for both standards.