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HELD FOR SALE AND DISCONTINUED OPERATIONS - Summary of details over assets and liabilities classified as held-for-sale (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Disclosure of Analysis of Assets and Liabilities Held For Sale [Line Items]    
Non-current assets or disposal groups classified as held for sale $ 1,864 $ 0
Liabilities associated with assets held for sale 391 0
Assets and liabilities classified as held for sale    
Disclosure of Analysis of Assets and Liabilities Held For Sale [Line Items]    
Non-current assets or disposal groups classified as held for sale 1,864  
Liabilities associated with assets held for sale 391  
Assets and liabilities classified as held for sale | Omnium Telecom Algerie SpA    
Disclosure of Analysis of Assets and Liabilities Held For Sale [Line Items]    
Non-current assets or disposal groups classified as held for sale 1,846  
Liabilities associated with assets held for sale 391  
Assets and liabilities classified as held for sale | Other Individual Assets    
Disclosure of Analysis of Assets and Liabilities Held For Sale [Line Items]    
Non-current assets or disposal groups classified as held for sale $ 18  
Liabilities associated with assets held for sale   $ 0