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The Millicom Group - A.1.2. Acquisition of subsidiaries and changes in non-controlling interests in subsidiaries (Details)
$ in Millions
 1 Months Ended 4 Months Ended 8 Months Ended 12 Months Ended
Aug. 29, 2019
USD ($)
Oct. 31, 2019
USD ($)
Dec. 31, 2019
USD ($)
$ / m
Dec. 31, 2019
USD ($)
$ / m
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
$ / m
Dec. 31, 2018
Nov. 12, 2021
USD ($)
Sep. 30, 2020
USD ($)
May 16, 2019
USD ($)
Feb. 20, 2019
USD ($)
Amounts recognised as of acquisition date for each major class of assets acquired and liabilities assumed [abstract]                        
Goodwill         $ 4,884 $ 1,659            
MIC Tanzania                        
Disclosure of detailed information about business combination [line items]                        
Equity decrease by net amount   $ 18                    
Non-controlling interests derecognized   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%                    
Guatemala joint ventures                        
Disclosure of detailed information about business combination [line items]                        
Proportion of ownership interest in subsidiary           55.00%   50.00%        
Guatemala joint ventures                        
Disclosure of detailed information about business combination [line items]                        
Percentage of controlling interest acquired                 45.00%      
Consideration transferred, acquisition-date fair value                 $ 2,195      
Acquisition-date fair value                 2,683      
Revenue of acquiree since acquisition date         223              
Net profit (loss) of acquiree since acquisition date         43              
Revenue of combined entity as if combination occurred at beginning of period         1,380              
Net profit (loss) of combined entity as if combination occurred at beginning of period         (147)              
Amounts recognised as of acquisition date for each major class of assets acquired and liabilities assumed [abstract]                        
Intangible assets (excluding goodwill), net                 1,294      
Property, plant and equipment, net                 547      
Right of use assets                 189      
Other non-current assets                 5      
Current assets (excluding cash)                 245      
Trade receivables                 42      
Cash and cash equivalents                 199      
Assets Recognised As Of Acquisition Date                 2,521      
Lease liabilities                 205      
Other debt and financing                 417      
Other liabilities                 280      
Liabilities Recognised As Of Acquisition Date                 901      
Identifiable assets acquired (liabilities assumed)                 1,620      
Acquisition price                 2,195      
Implied fair value                 4,877      
Carrying value of investment in joint venture                 2,013      
Goodwill recognised as of acquisition date                 2,588      
Revaluation of previously held interests                 670      
Goodwill                 $ 3,258      
Guatemala joint ventures | Trademarks                        
Amounts recognised as of acquisition date for each major class of assets acquired and liabilities assumed [abstract]                        
Intangible assets (excluding goodwill), net         $ 848              
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  
Cash consideration, provisionally adjusted     $ 430 $ 430   $ 426 $ 430          
Revenue of acquiree since acquisition date       144                
Net profit (loss) of acquiree since acquisition date       $ 5                
Revenue of combined entity as if combination occurred at beginning of period             219          
Net profit (loss) of combined entity as if combination occurred at beginning of period             (16)          
Amortisation of combined entity             $ 12          
Telefonia Celular de Nicaragua, S.A. | Market approach | Useful Life, Measurement Input | Land and Buildings | Bottom of range                        
Disclosure of detailed information about business combination [line items]                        
Significant unobservable inputs, assets, duration             10 years          
Telefonia Celular de Nicaragua, S.A. | Market approach | Useful Life, Measurement Input | Land and Buildings | Top of range                        
Disclosure of detailed information about business combination [line items]                        
Significant unobservable inputs, assets, duration             30 years          
Telefonia Celular de Nicaragua, S.A. | Market approach | Land and Buildings, Price per Square Meter, Measurement Input | Land and Buildings | Bottom of range                        
Disclosure of detailed information about business combination [line items]                        
Significant unobservable inputs, assets, price per square meter | $ / m     2 2     2          
Telefonia Celular de Nicaragua, S.A. | Market approach | Land and Buildings, Price per Square Meter, Measurement Input | Land and Buildings | Top of range                        
Disclosure of detailed information about business combination [line items]                        
Significant unobservable inputs, assets, price per square meter | $ / m     57 57     57          
Telefonia Celular de Nicaragua, S.A. | Cost approach | Useful Life, Measurement Input | Core Network | Bottom of range                        
Disclosure of detailed information about business combination [line items]                        
Significant unobservable inputs, assets, duration             5 years          
Telefonia Celular de Nicaragua, S.A. | Cost approach | Useful Life, Measurement Input | Core Network | Top of range                        
Disclosure of detailed information about business combination [line items]                        
Significant unobservable inputs, assets, duration             27 years          
Telefonia Celular de Nicaragua, S.A. | Cost approach | Remaining Useful Life, Measurement Input | Core Network                        
Disclosure of detailed information about business combination [line items]                        
Significant unobservable inputs, assets, estimated duration             1 year 8 months 12 days          
Telefonia Celular de Nicaragua, S.A. | Market approach - Market comparable transactions | Spectrum                        
Disclosure of detailed information about business combination [line items]                        
Significant unobservable inputs, assets, estimated duration             14 years          
Telefonia Celular de Nicaragua, S.A. | Market approach - Market comparable transactions | Discount rate | Spectrum                        
Disclosure of detailed information about business combination [line items]                        
Significant unobservable input, assets     0.14 0.14     0.14          
Telefonia Celular de Nicaragua, S.A. | Market approach - Market comparable transactions | Terminal Growth Rate, Measurement Input | Spectrum                        
Disclosure of detailed information about business combination [line items]                        
Significant unobservable input, assets     0.025 0.025     0.025          
Telefonia Celular de Nicaragua, S.A. | Income approach - Multi-Period Excess Earnings Method | Monthly Churn Rate, B2B, Measurement Input | Customer Lists                        
Disclosure of detailed information about business combination [line items]                        
Significant unobservable input, assets     0.012 0.012     0.012          
Telefonia Celular de Nicaragua, S.A. | Income approach - Multi-Period Excess Earnings Method | Monthly Churn Rate, B2C, Measurement Input | Customer Lists                        
Disclosure of detailed information about business combination [line items]                        
Significant unobservable input, assets     0.029 0.029     0.029          
Telefonia Celular de Nicaragua, S.A. | Income approach - Multi-Period Excess Earnings Method | Discount rate | Bottom of range | Customer Lists                        
Disclosure of detailed information about business combination [line items]                        
Significant unobservable input, assets     0.14 0.14     0.14          
Telefonia Celular de Nicaragua, S.A. | Income approach - Multi-Period Excess Earnings Method | Discount rate | Top of range | Customer Lists                        
Disclosure of detailed information about business combination [line items]                        
Significant unobservable input, assets     0.15 0.15     0.15          
Telefonia Celular de Nicaragua, S.A. | Income approach - Multi-Period Excess Earnings Method | EBITDA Margin, Measurement Input | Bottom of range | Customer Lists                        
Disclosure of detailed information about business combination [line items]                        
Significant unobservable input, assets     0.36 0.36     0.36          
Telefonia Celular de Nicaragua, S.A. | Income approach - Multi-Period Excess Earnings Method | EBITDA Margin, Measurement Input | Top of range | Customer Lists                        
Disclosure of detailed information about business combination [line items]                        
Significant unobservable input, assets     0.41 0.41     0.41          
Telefonica Moviles Panama                        
Disclosure of detailed information about business combination [line items]                        
Percentage of controlling interest acquired 100.00%                     100.00%
Consideration transferred, acquisition-date fair value     $ 587 $ 587     $ 587          
Cash consideration $ 594                      
Cash consideration, provisionally adjusted                   $ 587    
Revenue of acquiree since acquisition date     80                  
Net profit (loss) of acquiree since acquisition date     6                  
Revenue of combined entity as if combination occurred at beginning of period             158          
Net profit (loss) of combined entity as if combination occurred at beginning of period             1          
Amortisation of combined entity             3          
Amounts recognised as of acquisition date for each major class of assets acquired and liabilities assumed [abstract]                        
Acquisition price     $ 587 $ 587     587          
Telefonica Moviles Panama | Cost approach | Useful Life, Measurement Input | Property, Plant and Equipment | Bottom of range                        
Disclosure of detailed information about business combination [line items]                        
Significant unobservable inputs, assets, duration         3 years              
Telefonica Moviles Panama | Cost approach | Useful Life, Measurement Input | Property, Plant and Equipment | Top of range                        
Disclosure of detailed information about business combination [line items]                        
Significant unobservable inputs, assets, duration         27 years              
Telefonica Moviles Panama | Cost approach | Remaining Useful Life, Measurement Input | Property, Plant and Equipment | Bottom of range                        
Disclosure of detailed information about business combination [line items]                        
Significant unobservable inputs, assets, duration         3 years              
Telefonica Moviles Panama | Cost approach | Remaining Useful Life, Measurement Input | Property, Plant and Equipment | Top of range                        
Disclosure of detailed information about business combination [line items]                        
Significant unobservable inputs, assets, duration         27 years              
Telefonica Moviles Panama | Market approach - Market comparable transactions | EBITDA Margin, Measurement Input | Customer Lists                        
Disclosure of detailed information about business combination [line items]                        
Significant unobservable input, assets         0.415              
Telefonica Moviles Panama | Income approach - Multi-Period Excess Earnings Method | Monthly Churn Rate, B2B, Measurement Input | Customer Lists                        
Disclosure of detailed information about business combination [line items]                        
Significant unobservable input, assets         0.038              
Telefonica Moviles Panama | Income approach - Multi-Period Excess Earnings Method | Discount rate | Bottom of range | Customer Lists                        
Disclosure of detailed information about business combination [line items]                        
Significant unobservable input, assets         0.098              
Telefonica Moviles Panama | Income approach - Multi-Period Excess Earnings Method | Discount rate | Top of range | Customer Lists                        
Disclosure of detailed information about business combination [line items]                        
Significant unobservable input, assets         0.108              
Telefonica de Costa Rica TC, S.A.                        
Disclosure of detailed information about business combination [line items]                        
Percentage of controlling interest acquired                       100.00%
Telefonica CAM Acquisitions                        
Disclosure of detailed information about business combination [line items]                        
Consideration transferred, acquisition-date fair value                       $ 1,080
Acquisition-related costs recognised as expense for transaction recognised separately from acquisition of assets and assumption of liabilities in business combination             $ 16          
Amounts recognised as of acquisition date for each major class of assets acquired and liabilities assumed [abstract]                        
Acquisition price                       $ 1,080
Cable Onda S.A                        
Disclosure of detailed information about business combination [line items]                        
Proportion of ownership interest in subsidiary 80.00%