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The Millicom Group - A.1.2. Acquisition of subsidiaries and changes in non-controlling interests in subsidiaries - Finalization of Purchase Accounting (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of detailed information about business combination [line items]      
Intangible assets, net $ 7,361 $ 7,558 [1]  
Property, plant and equipment, net 2,989 3,382 [1] $ 2,755
Right of use assets, net 884 1,024 [1] $ 895
Prepayments and accrued income 117 166 [1]  
Other current assets 197 269 [1]  
Provisions and other current liabilities $ 305 548 [1]  
As reported      
Disclosure of detailed information about business combination [line items]      
Intangible assets, net   7,721  
Property, plant and equipment, net   3,198  
Right of use assets, net   1,008  
Prepayments and accrued income   168  
Other current assets   302  
Provisions and other current liabilities   546  
Impact of the finalization of the purchase accounting of Guatemala      
Disclosure of detailed information about business combination [line items]      
Intangible assets, net   (163)  
Property, plant and equipment, net   184  
Right of use assets, net   17  
Prepayments and accrued income   (2)  
Other current assets   (33)  
Provisions and other current liabilities   $ 2  
[1] Restated after the finalization of the Guatemala purchase accounting. See note A.1.2. for further details.