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Financial risk management - D.5. Liquidity risk (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
 [1]
Dec. 31, 2019
 [1]
Disclosure of nature and extent of risks arising from financial instruments [line items]        
Debt and financing $ (6,804) $ (7,744)    
Lease liabilities (1,016) (1,167)    
Cash and cash equivalents 1,039 895 [1],[2] $ 875 $ 1,164
Financial assets pledged as collateral for liabilities or contingent liabilities 0 35    
Net cash (debt) including derivatives related to debt (6,814) (7,961)    
Trade payables (excluding accruals) (17) (38)    
Put option liability 0 (290) [2]    
Trade receivables 379 405 [2]    
Liquidity risk        
Disclosure of nature and extent of risks arising from financial instruments [line items]        
Debt and financing (6,875) (7,744)    
Lease liabilities (1,016) (1,167)    
Cash and cash equivalents 1,039 895    
Financial assets pledged as collateral for liabilities or contingent liabilities   35    
Derivative financial instruments (34) 20    
Net cash (debt) including derivatives related to debt (6,814) (7,961)    
Future interest commitments related to debt and financing (1,877) (1,524)    
Future interest commitments related to leases (531) (704)    
Trade payables (excluding accruals) (689) (624)    
Other financial liabilities (including accruals) (867) (1,143)    
Put option liability   (290)    
Trade receivables 379 405    
Other financial assets 303 408    
Net financial liabilities $ (10,095) $ (11,431)    
Liquidity risk | Commercial Banks        
Disclosure of nature and extent of risks arising from financial instruments [line items]        
Concentration risk percentage 23.00% 41.00%    
Liquidity risk | Bonds        
Disclosure of nature and extent of risks arising from financial instruments [line items]        
Concentration risk percentage 64.00% 46.00%    
Liquidity risk | Finance lease liabilities        
Disclosure of nature and extent of risks arising from financial instruments [line items]        
Concentration risk percentage 13.00% 13.00%    
Liquidity risk | Deferred Financing Costs Netting        
Disclosure of nature and extent of risks arising from financial instruments [line items]        
Debt and financing $ 71    
Liquidity risk | Less than 1 year        
Disclosure of nature and extent of risks arising from financial instruments [line items]        
Debt and financing (181) (1,840)    
Lease liabilities (163) (171)    
Cash and cash equivalents 1,039 895    
Financial assets pledged as collateral for liabilities or contingent liabilities   35    
Derivative financial instruments 0 0    
Net cash (debt) including derivatives related to debt 697 (1,082)    
Future interest commitments related to debt and financing (416) (340)    
Future interest commitments related to leases (106) (144)    
Trade payables (excluding accruals) (689) (624)    
Other financial liabilities (including accruals) (867) (1,143)    
Put option liability   (290)    
Trade receivables 379 405    
Other financial assets 232 310    
Net financial liabilities (770) (2,907)    
Liquidity risk | Less than 1 year | Deferred Financing Costs Netting        
Disclosure of nature and extent of risks arising from financial instruments [line items]        
Debt and financing 1    
Liquidity risk | 1 to 5 years        
Disclosure of nature and extent of risks arising from financial instruments [line items]        
Debt and financing (2,880) (2,294)    
Lease liabilities (478) (591)    
Cash and cash equivalents 0 0    
Financial assets pledged as collateral for liabilities or contingent liabilities   0    
Derivative financial instruments (34) 20    
Net cash (debt) including derivatives related to debt (3,370) (2,865)    
Future interest commitments related to debt and financing (1,349) (1,086)    
Future interest commitments related to leases (290) (380)    
Trade payables (excluding accruals) 0 0    
Other financial liabilities (including accruals) 0 0    
Put option liability   0    
Trade receivables 0 0    
Other financial assets 71 98    
Net financial liabilities (4,938) (4,234)    
Liquidity risk | 1 to 5 years | Deferred Financing Costs Netting        
Disclosure of nature and extent of risks arising from financial instruments [line items]        
Debt and financing 23    
Liquidity risk | Greater than 5 years        
Disclosure of nature and extent of risks arising from financial instruments [line items]        
Debt and financing (3,813) (3,610)    
Lease liabilities (374) (404)    
Cash and cash equivalents 0 0    
Financial assets pledged as collateral for liabilities or contingent liabilities   0    
Derivative financial instruments 0 0    
Net cash (debt) including derivatives related to debt (4,141) (4,014)    
Future interest commitments related to debt and financing (111) (98)    
Future interest commitments related to leases (135) (179)    
Trade payables (excluding accruals) 0 0    
Other financial liabilities (including accruals) 0 0    
Put option liability   0    
Trade receivables 0 0    
Other financial assets 0 0    
Net financial liabilities (4,387) (4,291)    
Liquidity risk | Greater than 5 years | Deferred Financing Costs Netting        
Disclosure of nature and extent of risks arising from financial instruments [line items]        
Debt and financing $ 47    
[1] Re-presented for discontinued operations (see note A.4.).
[2] Restated after the finalization of the Guatemala purchase accounting. See note A.1.2. for further details.