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Financial risk management - D.5. Liquidity risk (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
 [2]
Dec. 31, 2017
 [2]
Disclosure of nature and extent of risks arising from financial instruments [line items]        
Debt and financing $ (5,691) $ (5,972)    
Lease liabilities (1,021) (1,096)    
Cash and cash equivalents 875 1,164 [1] $ 528 $ 619
Pledged deposits (related to back borrowings) 0 1    
Net cash (debt) including derivatives related to debt (5,849) (5,885)    
Trade payables (excluding accruals) (46) (40)    
Derivative financial liabilities 12 (17)    
Put option liability (262) (264) [1]    
Trade receivables 351 371 [1]    
Liquidity risk        
Disclosure of nature and extent of risks arising from financial instruments [line items]        
Debt and financing (5,691) (5,972)    
Lease liabilities (1,021) (1,096)    
Cash and cash equivalents 875 1,164    
Pledged deposits (related to back borrowings) 0 1    
Refundable deposit 0 0    
Derivative financial instruments 12 (17)    
Net cash (debt) including derivatives related to debt (5,825) (5,920)    
Future interest commitments related to debt and financing   (1,502)    
Future interest commitments related to debt and financing (1,484)      
Future interest commitments related to leases (759) (928)    
Trade payables (excluding accruals) (576) (510)    
Other financial liabilities (including accruals) (1,214) (1,389)    
Put option liability (262) (264)    
Trade receivables 351 371    
Other financial assets 735 717    
Net financial liabilities (9,034) (9,425)    
Liquidity risk | Less than 1 year        
Disclosure of nature and extent of risks arising from financial instruments [line items]        
Debt and financing (113) (186)    
Lease liabilities (123) (107)    
Cash and cash equivalents 875 1,164    
Pledged deposits (related to back borrowings) 0 1    
Refundable deposit 0 0    
Derivative financial instruments 0 (17)    
Net cash (debt) including derivatives related to debt 639 855    
Future interest commitments related to debt and financing   (308)    
Future interest commitments related to debt and financing (311)      
Future interest commitments related to leases (146) (157)    
Trade payables (excluding accruals) (576) (510)    
Other financial liabilities (including accruals) (1,185) (1,052)    
Put option liability (262) (264)    
Trade receivables 351 371    
Other financial assets 568 613    
Net financial liabilities (922) (452)    
Liquidity risk | 1 to 5 years        
Disclosure of nature and extent of risks arising from financial instruments [line items]        
Debt and financing (1,824) (1,902)    
Lease liabilities (525) (490)    
Cash and cash equivalents 0 0    
Pledged deposits (related to back borrowings) 0 0    
Refundable deposit 0 0    
Derivative financial instruments 12 0    
Net cash (debt) including derivatives related to debt (2,336) (2,392)    
Future interest commitments related to debt and financing   (1,088)    
Future interest commitments related to debt and financing (1,069)      
Future interest commitments related to leases (410) (476)    
Trade payables (excluding accruals) 0 0    
Other financial liabilities (including accruals) (29) (337)    
Put option liability 0 0    
Trade receivables 0 0    
Other financial assets 167 104    
Net financial liabilities (3,676) (4,189)    
Liquidity risk | Greater than 5 years        
Disclosure of nature and extent of risks arising from financial instruments [line items]        
Debt and financing (3,755) (3,884)    
Lease liabilities (373) (498)    
Cash and cash equivalents 0 0    
Pledged deposits (related to back borrowings) 0 0    
Refundable deposit 0 0    
Derivative financial instruments 0 0    
Net cash (debt) including derivatives related to debt (4,128) (4,383)    
Future interest commitments related to debt and financing   (106)    
Future interest commitments related to debt and financing (104)      
Future interest commitments related to leases (203) (295)    
Trade payables (excluding accruals) 0 0    
Other financial liabilities (including accruals) 0 0    
Put option liability 0 0    
Trade receivables 0 0    
Other financial assets 0 0    
Net financial liabilities $ (4,435) $ (4,784)    
Commercial Banks | Liquidity risk        
Disclosure of nature and extent of risks arising from financial instruments [line items]        
Concentration risk percentage 20.00% 26.00%    
Bonds | Liquidity risk        
Disclosure of nature and extent of risks arising from financial instruments [line items]        
Concentration risk percentage 64.00% 58.00%    
Development Finance Institutions | Liquidity risk        
Disclosure of nature and extent of risks arising from financial instruments [line items]        
Concentration risk percentage 1.00% 1.00%    
Leases | Liquidity risk        
Disclosure of nature and extent of risks arising from financial instruments [line items]        
Concentration risk percentage 15.00% 15.00%    
[1] The consolidated statement of financial position at December 31, 2019 has been restated after finalization of the purchase accounting of our acquisitions in Nicaragua and Panama (note A.1.2.).
[2] 2018 was not restated for the application of IFRS 16, as the Group elected the modified retrospective approach.