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The Millicom Group - A.1.2. Acquisition of subsidiaries and changes in non-controlling interests in subsidiaries (Details)
 1 Months Ended 3 Months Ended 4 Months Ended 8 Months Ended 12 Months Ended
Aug. 29, 2019
USD ($)
Dec. 13, 2018
USD ($)
Oct. 07, 2018
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Oct. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
May 16, 2019
USD ($)
Feb. 20, 2019
USD ($)
Disclosure of detailed information about business combination [line items]                          
Non-controlling interests                 $ 5,000,000 $ (16,000,000) [1] $ (17,000,000) [1]    
Amounts Recognised as of Final Fair Value Date for Each Major Class of Assets Acquired and Liabilities Assumed [Abstract]                          
Changes in cash and cash equivalents                 645,000,000 (98,000,000) [2] $ (8,000,000) [2]    
Telefonica CAM Acquisitions                          
Disclosure of detailed information about business combination [line items]                          
Acquisition-related costs recognised as expense for transaction recognised separately from acquisition of assets and assumption of liabilities in business combination                 16,000,000        
Amounts recognised as of acquisition date for each major class of assets acquired and liabilities assumed [abstract]                          
Acquisition price                         $ 1,650,000,000
Telefonica Moviles Panama                          
Disclosure of detailed information about business combination [line items]                          
Percentage of controlling interest acquired 100.00%                       100.00%
Cash consideration $ 594,000,000                        
Amounts recognised as of acquisition date for each major class of assets acquired and liabilities assumed [abstract]                          
Intangible assets (excluding goodwill), net             $ 169,000,000 $ 169,000,000 169,000,000        
Property, plant and equipment, net             110,000,000 110,000,000 110,000,000        
Right of use assets             57,000,000 57,000,000 57,000,000        
Other non-current assets             3,000,000 3,000,000 3,000,000        
Current assets (excluding cash)             23,000,000 23,000,000 23,000,000        
Trade receivables 21,000,000           21,000,000 21,000,000 21,000,000        
Cash and cash equivalents             10,000,000 10,000,000 10,000,000        
Total assets acquired             391,000,000 391,000,000 391,000,000        
Lease liabilities             48,000,000 48,000,000 48,000,000        
Other debt and financing             74,000,000 74,000,000 74,000,000        
Other liabilities             101,000,000 101,000,000 101,000,000        
Fair value of assets acquired and liabilities assumed, net             224,000,000 224,000,000 224,000,000        
Fair value of assets acquired and liabilities assumed, net             167,000,000 167,000,000 167,000,000        
Acquisition price             594,000,000 594,000,000 594,000,000        
Provisional Goodwill             426,000,000 426,000,000 426,000,000        
Amounts Recognised as of Final Fair Value Date for Each Major Class of Assets Acquired and Liabilities Assumed [Abstract]                          
Deferred tax liabilities $ 15,000,000                        
Revenue of acquiree since acquisition date             80,000,000            
Net profit (loss) of acquiree since acquisition date             6,000,000            
Revenue of combined entity as if combination occurred at beginning of period                 158,000,000        
Net profit (loss) of combined entity as if combination occurred at beginning of period                 1,000,000        
Amortisation of combined entity                 3,000,000        
Telefonica Moviles Panama | Spectrum                          
Amounts Recognised as of Final Fair Value Date for Each Major Class of Assets Acquired and Liabilities Assumed [Abstract]                          
Intangible assets useful lives 17 years                        
Fair value step-up on spectrum $ 3,000,000                        
Telefonica Moviles Panama | Customer Lists                          
Amounts Recognised as of Final Fair Value Date for Each Major Class of Assets Acquired and Liabilities Assumed [Abstract]                          
Intangible assets not previously recognized at the date of acquisition $ 58,000,000                        
Cable Onda S.A                          
Disclosure of detailed information about business combination [line items]                          
Acquisition-related costs recognised as expense for transaction recognised separately from acquisition of assets and assumption of liabilities in business combination     $ 11,000,000                    
Proportion of ownership interest in subsidiary 80.00%                        
Enterprise value of acquired entity $ 1,460,000,000                        
Percentage ownership held by non-controlling interest 20.00% 20.00%                      
Amounts recognised as of acquisition date for each major class of assets acquired and liabilities assumed [abstract]                          
Intangible assets (excluding goodwill), net     673,000,000   $ 653,000,000 $ 653,000,000       653,000,000      
Property, plant and equipment, net     348,000,000   378,000,000 378,000,000       378,000,000      
Current assets (excluding cash)     54,000,000   50,000,000 50,000,000       50,000,000      
Cash and cash equivalents     12,000,000   12,000,000 12,000,000       12,000,000      
Total assets acquired     1,088,000,000   1,094,000,000 1,094,000,000       1,094,000,000      
Non-current liabilities     422,000,000   425,000,000 425,000,000       425,000,000      
Current liabilities     141,000,000   134,000,000 134,000,000       134,000,000      
Fair value of assets acquired and liabilities assumed, net     563,000,000   559,000,000 559,000,000       559,000,000      
Transaction costs assumed by Cable Onda     30,000,000   30,000,000 30,000,000       30,000,000      
Fair value of non-controlling interest in Cable Onda (20%)     111,000,000   113,000,000 113,000,000       113,000,000      
Millicom’s interest in the fair value of Cable Onda (80%)     444,000,000   452,000,000 452,000,000       452,000,000      
Fair value of assets acquired and liabilities assumed, net     525,000,000   535,000,000 535,000,000       535,000,000      
Acquisition price     956,000,000   956,000,000 956,000,000       956,000,000      
Provisional Goodwill     512,000,000   504,000,000 504,000,000       504,000,000      
Amounts Recognised as of Final Fair Value Date for Each Major Class of Assets Acquired and Liabilities Assumed [Abstract]                          
Changes in intangible assets (excluding goodwill)           (20,000,000)              
Changes in cash and cash equivalents           0              
Changes in property, plant and equipment           30,000,000              
Changes in current assets (excluding cash)           (4,000,000)              
Changes in total assets acquired           6,000,000              
Changes in non-current liabilities           3,000,000              
Changes in current liabilities           (7,000,000)              
Changes in total liabilities assumed           (4,000,000)              
Changes in fair value of assets acquired and liabilities assumed, net           10,000,000              
Changes in transactions costs assumed           0              
Changes fair value of non-controlling interest           2,000,000              
Changes in Millicom's interest in fair value of acquiree           8,000,000              
Changes in acquisition price           0              
Changes in final goodwill           $ (8,000,000)              
Fair value step-up of property, plant and equipment     $ 30,000,000                    
Useful life measured as period of time, property, plant and equipment     5 years                    
Deferred tax liabilities     $ 161,000,000                    
Fair value of acquired receivables     34,000,000                    
Revenue of acquiree since acquisition date         17,000,000                
Net profit (loss) of acquiree since acquisition date         $ (7,000,000)                
Revenue of combined entity as if combination occurred at beginning of period                   403,000,000      
Net profit (loss) of combined entity as if combination occurred at beginning of period                   (59,000,000)      
Amortisation of combined entity                   $ 85,000,000      
Cable Onda S.A | Brand names                          
Amounts recognised as of acquisition date for each major class of assets acquired and liabilities assumed [abstract]                          
Intangible assets (excluding goodwill), net     $ 280,000,000                    
Amounts Recognised as of Final Fair Value Date for Each Major Class of Assets Acquired and Liabilities Assumed [Abstract]                          
Intangible assets useful lives     3 years                    
Cable Onda S.A | Customer Lists                          
Amounts recognised as of acquisition date for each major class of assets acquired and liabilities assumed [abstract]                          
Intangible assets (excluding goodwill), net     $ 350,000,000                    
Amounts Recognised as of Final Fair Value Date for Each Major Class of Assets Acquired and Liabilities Assumed [Abstract]                          
Intangible assets useful lives     20 years                    
Cable Onda S.A | Favorable content contracts                          
Amounts recognised as of acquisition date for each major class of assets acquired and liabilities assumed [abstract]                          
Intangible assets (excluding goodwill), net     $ 19,000,000                    
Amounts Recognised as of Final Fair Value Date for Each Major Class of Assets Acquired and Liabilities Assumed [Abstract]                          
Intangible assets useful lives     10 years                    
Telefonica de Costa Rica TC, S.A.                          
Disclosure of detailed information about business combination [line items]                          
Percentage of controlling interest acquired                         100.00%
Telefonia Celular de Nicaragua, S.A.                          
Disclosure of detailed information about business combination [line items]                          
Percentage of controlling interest acquired                         100.00%
Cash consideration                       $ 437,000,000  
Cash consideration, provisionally adjusted             430,000,000 430,000,000 430,000,000        
Amounts recognised as of acquisition date for each major class of assets acquired and liabilities assumed [abstract]                          
Intangible assets (excluding goodwill), net             131,000,000 131,000,000 131,000,000        
Property, plant and equipment, net             149,000,000 149,000,000 149,000,000        
Right of use assets             131,000,000 131,000,000 131,000,000        
Other non-current assets             2,000,000 2,000,000 2,000,000        
Current assets (excluding cash)             23,000,000 23,000,000 23,000,000        
Trade receivables             17,000,000 17,000,000 17,000,000        
Cash and cash equivalents             7,000,000 7,000,000 7,000,000        
Total assets acquired             459,000,000 459,000,000 459,000,000        
Lease liabilities             131,000,000 131,000,000 131,000,000        
Other liabilities             118,000,000 118,000,000 118,000,000        
Fair value of assets acquired and liabilities assumed, net             249,000,000 249,000,000 249,000,000        
Fair value of assets acquired and liabilities assumed, net             210,000,000 210,000,000 210,000,000        
Acquisition price             430,000,000 430,000,000 430,000,000        
Provisional Goodwill             220,000,000 220,000,000 220,000,000        
Amounts Recognised as of Final Fair Value Date for Each Major Class of Assets Acquired and Liabilities Assumed [Abstract]                          
Fair value step-up of property, plant and equipment             39,000,000 39,000,000 39,000,000        
Right-of-use assets adjusted             7,000,000 7,000,000 7,000,000        
Indemnification assets for tax contingencies             11,000,000 11,000,000 11,000,000        
Tax contingent liabilities             1,000,000 1,000,000 1,000,000        
Deferred tax liabilities             50,000,000 50,000,000 50,000,000        
Revenue of acquiree since acquisition date               144,000,000          
Net profit (loss) of acquiree since acquisition date               5,000,000          
Revenue of combined entity as if combination occurred at beginning of period                 219,000,000        
Net profit (loss) of combined entity as if combination occurred at beginning of period                 (16,000,000)        
Amortisation of combined entity                 $ 12,000,000        
Telefonia Celular de Nicaragua, S.A. | Spectrum                          
Amounts Recognised as of Final Fair Value Date for Each Major Class of Assets Acquired and Liabilities Assumed [Abstract]                          
Intangible assets useful lives                 14 years        
Fair value step-up on spectrum             39,000,000 39,000,000 $ 39,000,000        
Telefonia Celular de Nicaragua, S.A. | Customer Lists                          
Amounts Recognised as of Final Fair Value Date for Each Major Class of Assets Acquired and Liabilities Assumed [Abstract]                          
Intangible assets not previously recognized at the date of acquisition             81,000,000 81,000,000 $ 81,000,000        
Bottom of range | Brand names                          
Amounts Recognised as of Final Fair Value Date for Each Major Class of Assets Acquired and Liabilities Assumed [Abstract]                          
Intangible assets useful lives                 1 year        
Bottom of range | Customer Lists                          
Amounts Recognised as of Final Fair Value Date for Each Major Class of Assets Acquired and Liabilities Assumed [Abstract]                          
Intangible assets useful lives                 4 years        
Bottom of range | Telefonica Moviles Panama                          
Amounts Recognised as of Final Fair Value Date for Each Major Class of Assets Acquired and Liabilities Assumed [Abstract]                          
Intangible assets useful lives 3 years                        
Bottom of range | Telefonia Celular de Nicaragua, S.A.                          
Amounts Recognised as of Final Fair Value Date for Each Major Class of Assets Acquired and Liabilities Assumed [Abstract]                          
Useful life measured as period of time, property, plant and equipment                 6 years        
Bottom of range | Telefonia Celular de Nicaragua, S.A. | Customer Lists                          
Amounts Recognised as of Final Fair Value Date for Each Major Class of Assets Acquired and Liabilities Assumed [Abstract]                          
Intangible assets useful lives                 4 years        
Top of range | Brand names                          
Amounts Recognised as of Final Fair Value Date for Each Major Class of Assets Acquired and Liabilities Assumed [Abstract]                          
Intangible assets useful lives                 15 years        
Top of range | Customer Lists                          
Amounts Recognised as of Final Fair Value Date for Each Major Class of Assets Acquired and Liabilities Assumed [Abstract]                          
Intangible assets useful lives                 20 years        
Top of range | Telefonica Moviles Panama                          
Amounts Recognised as of Final Fair Value Date for Each Major Class of Assets Acquired and Liabilities Assumed [Abstract]                          
Intangible assets useful lives 17 years                        
Top of range | Telefonia Celular de Nicaragua, S.A.                          
Amounts Recognised as of Final Fair Value Date for Each Major Class of Assets Acquired and Liabilities Assumed [Abstract]                          
Useful life measured as period of time, property, plant and equipment                 7 years        
Top of range | Telefonia Celular de Nicaragua, S.A. | Customer Lists                          
Amounts Recognised as of Final Fair Value Date for Each Major Class of Assets Acquired and Liabilities Assumed [Abstract]                          
Intangible assets useful lives                 10 years        
Land and Buildings | Telefonia Celular de Nicaragua, S.A.                          
Amounts Recognised as of Final Fair Value Date for Each Major Class of Assets Acquired and Liabilities Assumed [Abstract]                          
Fair value step-up of property, plant and equipment             8,000,000 8,000,000 $ 8,000,000        
Core Network | Cable Onda S.A                          
Amounts Recognised as of Final Fair Value Date for Each Major Class of Assets Acquired and Liabilities Assumed [Abstract]                          
Fair value step-up of property, plant and equipment     $ 11,000,000                    
Core Network | Telefonia Celular de Nicaragua, S.A.                          
Amounts Recognised as of Final Fair Value Date for Each Major Class of Assets Acquired and Liabilities Assumed [Abstract]                          
Fair value step-up of property, plant and equipment             $ 25,000,000 $ 25,000,000 $ 25,000,000        
Income approach - Relief-from-Royalty approach | Discount rate | Cable Onda S.A | Brand names                          
Amounts Recognised as of Final Fair Value Date for Each Major Class of Assets Acquired and Liabilities Assumed [Abstract]                          
Significant unobservable input, assets             0.10 0.10 0.10        
Market approach - Market comparable transactions | Telefonica Moviles Panama | Spectrum                          
Amounts Recognised as of Final Fair Value Date for Each Major Class of Assets Acquired and Liabilities Assumed [Abstract]                          
Significant unobservable inputs, assets, estimated duration               17 years          
Market approach - Market comparable transactions | Telefonia Celular de Nicaragua, S.A. | Spectrum                          
Amounts Recognised as of Final Fair Value Date for Each Major Class of Assets Acquired and Liabilities Assumed [Abstract]                          
Significant unobservable inputs, assets, estimated duration                 14 years        
Market approach - Market comparable transactions | Discount rate | Telefonica Moviles Panama | Spectrum                          
Amounts Recognised as of Final Fair Value Date for Each Major Class of Assets Acquired and Liabilities Assumed [Abstract]                          
Significant unobservable input, assets             0.098 0.098 0.098        
Market approach - Market comparable transactions | Discount rate | Telefonia Celular de Nicaragua, S.A. | Spectrum                          
Amounts Recognised as of Final Fair Value Date for Each Major Class of Assets Acquired and Liabilities Assumed [Abstract]                          
Significant unobservable input, assets             0.14 0.14 0.14        
Market approach - Market comparable transactions | Terminal Growth Rate, Measurement Input | Telefonica Moviles Panama | Spectrum                          
Amounts Recognised as of Final Fair Value Date for Each Major Class of Assets Acquired and Liabilities Assumed [Abstract]                          
Significant unobservable input, assets             0.029 0.029 0.029        
Market approach - Market comparable transactions | Terminal Growth Rate, Measurement Input | Telefonia Celular de Nicaragua, S.A. | Spectrum                          
Amounts Recognised as of Final Fair Value Date for Each Major Class of Assets Acquired and Liabilities Assumed [Abstract]                          
Significant unobservable input, assets             2.500 2.500 2.500        
Market approach - Market comparable transactions | Royalty Rate, Measurement Input | Cable Onda S.A | Brand names                          
Amounts Recognised as of Final Fair Value Date for Each Major Class of Assets Acquired and Liabilities Assumed [Abstract]                          
Significant unobservable input, assets             0.045 0.045 0.045        
Market approach - Market comparable transactions | Tax Rate, Measurement Input | Cable Onda S.A | Brand names                          
Amounts Recognised as of Final Fair Value Date for Each Major Class of Assets Acquired and Liabilities Assumed [Abstract]                          
Significant unobservable input, assets             0.25 0.25 0.25        
Market approach - Market comparable transactions | EBITDA Margin, Measurement Input | Cable Onda S.A | Customer Lists                          
Amounts Recognised as of Final Fair Value Date for Each Major Class of Assets Acquired and Liabilities Assumed [Abstract]                          
Significant unobservable input, assets             0.48 0.48 0.48        
Income approach - Multi-Period Excess Earnings Method | Discount rate | Cable Onda S.A | Customer Lists                          
Amounts Recognised as of Final Fair Value Date for Each Major Class of Assets Acquired and Liabilities Assumed [Abstract]                          
Significant unobservable input, assets             0.10 0.10 0.10        
Income approach - Multi-Period Excess Earnings Method | Discount rate | Bottom of range | Telefonica Moviles Panama | Customer Lists                          
Amounts Recognised as of Final Fair Value Date for Each Major Class of Assets Acquired and Liabilities Assumed [Abstract]                          
Significant unobservable input, assets             0.098 0.098 0.098        
Income approach - Multi-Period Excess Earnings Method | Discount rate | Bottom of range | Telefonia Celular de Nicaragua, S.A. | Customer Lists                          
Amounts Recognised as of Final Fair Value Date for Each Major Class of Assets Acquired and Liabilities Assumed [Abstract]                          
Significant unobservable input, assets             0.14 0.14 0.14        
Income approach - Multi-Period Excess Earnings Method | Discount rate | Top of range | Telefonica Moviles Panama | Customer Lists                          
Amounts Recognised as of Final Fair Value Date for Each Major Class of Assets Acquired and Liabilities Assumed [Abstract]                          
Significant unobservable input, assets             0.11 0.11 0.11        
Income approach - Multi-Period Excess Earnings Method | Discount rate | Top of range | Telefonia Celular de Nicaragua, S.A. | Customer Lists                          
Amounts Recognised as of Final Fair Value Date for Each Major Class of Assets Acquired and Liabilities Assumed [Abstract]                          
Significant unobservable input, assets             0.15 0.15 0.15        
Income approach - Multi-Period Excess Earnings Method | Monthly Churn Rate, B2B, Measurement Input | Telefonia Celular de Nicaragua, S.A. | Customer Lists                          
Amounts Recognised as of Final Fair Value Date for Each Major Class of Assets Acquired and Liabilities Assumed [Abstract]                          
Significant unobservable input, assets             0.012 0.012 0.012        
Income approach - Multi-Period Excess Earnings Method | Monthly Churn Rate, B2C, Measurement Input | Telefonia Celular de Nicaragua, S.A. | Customer Lists                          
Amounts Recognised as of Final Fair Value Date for Each Major Class of Assets Acquired and Liabilities Assumed [Abstract]                          
Significant unobservable input, assets             0.029 0.029 0.029        
Income approach - Multi-Period Excess Earnings Method | Monthly Churn Rate, Postpaid, Measurement Input | Bottom of range | Telefonica Moviles Panama | Customer Lists                          
Amounts Recognised as of Final Fair Value Date for Each Major Class of Assets Acquired and Liabilities Assumed [Abstract]                          
Significant unobservable input, assets             0.004 0.004 0.004        
Income approach - Multi-Period Excess Earnings Method | Monthly Churn Rate, B2B, Measurement Input | Cable Onda S.A | Customer Lists                          
Amounts Recognised as of Final Fair Value Date for Each Major Class of Assets Acquired and Liabilities Assumed [Abstract]                          
Significant unobservable input, assets             0.058 0.058 0.058        
Income approach - Multi-Period Excess Earnings Method | EBITDA Margin, Measurement Input | Bottom of range | Telefonica Moviles Panama | Customer Lists                          
Amounts Recognised as of Final Fair Value Date for Each Major Class of Assets Acquired and Liabilities Assumed [Abstract]                          
Significant unobservable input, assets             0.35 0.35 0.35        
Income approach - Multi-Period Excess Earnings Method | EBITDA Margin, Measurement Input | Bottom of range | Telefonia Celular de Nicaragua, S.A. | Customer Lists                          
Amounts Recognised as of Final Fair Value Date for Each Major Class of Assets Acquired and Liabilities Assumed [Abstract]                          
Significant unobservable input, assets             0.36 0.36 0.36        
Income approach - Multi-Period Excess Earnings Method | EBITDA Margin, Measurement Input | Top of range | Telefonica Moviles Panama | Customer Lists                          
Amounts Recognised as of Final Fair Value Date for Each Major Class of Assets Acquired and Liabilities Assumed [Abstract]                          
Significant unobservable input, assets             0.39 0.39 0.39        
Income approach - Multi-Period Excess Earnings Method | EBITDA Margin, Measurement Input | Top of range | Telefonia Celular de Nicaragua, S.A. | Customer Lists                          
Amounts Recognised as of Final Fair Value Date for Each Major Class of Assets Acquired and Liabilities Assumed [Abstract]                          
Significant unobservable input, assets             0.41 0.41 0.41        
Income approach - Multi-Period Excess Earnings Method | Monthly Churn Rate, Prepaid, Measurement Input | Top of range | Telefonica Moviles Panama | Customer Lists                          
Amounts Recognised as of Final Fair Value Date for Each Major Class of Assets Acquired and Liabilities Assumed [Abstract]                          
Significant unobservable input, assets             0.039 0.039 0.039        
Market approach | Useful Life, Measurement Input | Land and Buildings | Bottom of range | Telefonia Celular de Nicaragua, S.A.                          
Amounts Recognised as of Final Fair Value Date for Each Major Class of Assets Acquired and Liabilities Assumed [Abstract]                          
Significant unobservable inputs, assets, duration                 10 years        
Market approach | Useful Life, Measurement Input | Land and Buildings | Top of range | Telefonia Celular de Nicaragua, S.A.                          
Amounts Recognised as of Final Fair Value Date for Each Major Class of Assets Acquired and Liabilities Assumed [Abstract]                          
Significant unobservable inputs, assets, duration                 30 years        
Market approach | Land and Buildings, Price per Square Meter, Measurement Input | Land and Buildings | Bottom of range | Telefonia Celular de Nicaragua, S.A.                          
Amounts Recognised as of Final Fair Value Date for Each Major Class of Assets Acquired and Liabilities Assumed [Abstract]                          
Significant unobservable inputs, assets, price per square meter             $ 2 $ 2 $ 2        
Market approach | Land and Buildings, Price per Square Meter, Measurement Input | Land and Buildings | Top of range | Telefonia Celular de Nicaragua, S.A.                          
Amounts Recognised as of Final Fair Value Date for Each Major Class of Assets Acquired and Liabilities Assumed [Abstract]                          
Significant unobservable inputs, assets, price per square meter             $ 57 $ 57 $ 57        
Cost approach | Useful Life, Measurement Input | Property, Plant and Equipment | Bottom of range | Cable Onda S.A                          
Amounts Recognised as of Final Fair Value Date for Each Major Class of Assets Acquired and Liabilities Assumed [Abstract]                          
Significant unobservable inputs, assets, duration                 5 years        
Cost approach | Useful Life, Measurement Input | Property, Plant and Equipment | Top of range | Cable Onda S.A                          
Amounts Recognised as of Final Fair Value Date for Each Major Class of Assets Acquired and Liabilities Assumed [Abstract]                          
Significant unobservable inputs, assets, duration                 15 years        
Cost approach | Useful Life, Measurement Input | Core Network | Bottom of range | Telefonia Celular de Nicaragua, S.A.                          
Amounts Recognised as of Final Fair Value Date for Each Major Class of Assets Acquired and Liabilities Assumed [Abstract]                          
Significant unobservable inputs, assets, duration                 5 years        
Cost approach | Useful Life, Measurement Input | Core Network | Top of range | Telefonia Celular de Nicaragua, S.A.                          
Amounts Recognised as of Final Fair Value Date for Each Major Class of Assets Acquired and Liabilities Assumed [Abstract]                          
Significant unobservable inputs, assets, duration                 27 years        
Cost approach | Remaining Useful Life, Measurement Input | Property, Plant and Equipment | Bottom of range | Cable Onda S.A                          
Amounts Recognised as of Final Fair Value Date for Each Major Class of Assets Acquired and Liabilities Assumed [Abstract]                          
Significant unobservable inputs, assets, duration                 2 years        
Cost approach | Remaining Useful Life, Measurement Input | Property, Plant and Equipment | Top of range | Cable Onda S.A                          
Amounts Recognised as of Final Fair Value Date for Each Major Class of Assets Acquired and Liabilities Assumed [Abstract]                          
Significant unobservable inputs, assets, duration                 8 years        
Cost approach | Remaining Useful Life, Measurement Input | Core Network | Telefonia Celular de Nicaragua, S.A.                          
Amounts Recognised as of Final Fair Value Date for Each Major Class of Assets Acquired and Liabilities Assumed [Abstract]                          
Significant unobservable inputs, assets, estimated duration                 1 year 8 months 12 days        
MIC Tanzania                          
Disclosure of detailed information about business combination [line items]                          
Equity decrease by net amount       $ 18,000,000                  
Percentage ownership held by non-controlling interest       (15.00%)                  
MIC Tanzania | Government of Zanzibar                          
Disclosure of detailed information about business combination [line items]                          
Percentage of controlling interest acquired       1.50%                  
Proportion of ownership interest in subsidiary       15.00%                  
Cable Onda S.A                          
Disclosure of detailed information about business combination [line items]                          
Percentage of controlling interest acquired     80.00%                    
Cash consideration   $ 956,000,000                      
Proportion of ownership interest in subsidiary                 80.00% 80.00% 0.00%    
Percentage ownership held by non-controlling interest   20.00% 20.00%                    
[1] Re-presented for discontinued operations (shown in note A.4.) 2018 and 2017 were not restated for the application of IFRS 16, and, additionally, 2017 was not restated for the application of IFRS 15 and IFRS 9, as the Group elected the modified retrospective approach.
[2] Re-presented for discontinued operations (shown in note A.4. and E.4.2.). 2018 and 2017 were not restated for the application of IFRS 16, and , additionally,2017 was not restated for the application of IFRS 15 and IFRS 9, as the Group elected the modified retrospective approach.