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Financial risk management - D.5. Liquidity risk (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Jan. 01, 2018
Dec. 31, 2017
Dec. 31, 2016
[1]
Dec. 31, 2015
[1]
Disclosure of nature and extent of risks arising from financial instruments [line items]          
Debt and financing $ (4,580)   $ (3,785)    
Cash and cash equivalents 528   619 [1] $ 646 $ 769
Pledged deposits (related to bank borrowings) 2   1    
Derivative financial liabilities 0   (56)    
Net cash (debt) including derivatives related to debt (4,051)   (3,220)    
Trade payables (excluding accruals) (26)   (25)    
Put Option liability (239)   0 [2]    
Trade receivables 343 $ 339 386    
Liquidity risk          
Disclosure of nature and extent of risks arising from financial instruments [line items]          
Debt and financing (4,580)   (3,785)    
Cash and cash equivalents 528   619    
Pledged deposits (related to bank borrowings) 2   1    
Derivative financial liabilities 0   (56)    
Net cash (debt) including derivatives related to debt (4,051)   (3,220)    
Future interest commitments (1,111)   (1,108)    
Trade payables (excluding accruals) (478)   (427)    
Other financial liabilities (including accruals) (1,352)   (1,218)    
Put Option liability (239)        
Trade receivables 343   386    
Other financial assets 310   257    
Net financial liabilities (6,578)   (5,330)    
Liquidity risk | Less than 1 year          
Disclosure of nature and extent of risks arising from financial instruments [line items]          
Debt and financing (458)   (185)    
Cash and cash equivalents 528   619    
Pledged deposits (related to bank borrowings) 2   1    
Derivative financial liabilities 0   (56)    
Net cash (debt) including derivatives related to debt 72   380    
Future interest commitments (248)   (255)    
Trade payables (excluding accruals) (478)   (427)    
Other financial liabilities (including accruals) (1,217)   (1,094)    
Put Option liability (239)        
Trade receivables 343   386    
Other financial assets 184   144    
Net financial liabilities (1,583)   (866)    
Liquidity risk | 1 to 5 years          
Disclosure of nature and extent of risks arising from financial instruments [line items]          
Debt and financing (1,778)   (1,862)    
Cash and cash equivalents 0   0    
Pledged deposits (related to bank borrowings) 0   0    
Derivative financial liabilities 0   0    
Net cash (debt) including derivatives related to debt (1,778)   (1,862)    
Future interest commitments (786)   (785)    
Trade payables (excluding accruals) 0   0    
Other financial liabilities (including accruals) (135)   (124)    
Put Option liability 0        
Trade receivables 0   0    
Other financial assets 126   113    
Net financial liabilities (2,573)   (2,658)    
Liquidity risk | Greater than 5 years          
Disclosure of nature and extent of risks arising from financial instruments [line items]          
Debt and financing (2,345)   (1,738)    
Cash and cash equivalents 0   0    
Pledged deposits (related to bank borrowings) 0   0    
Derivative financial liabilities 0   0    
Net cash (debt) including derivatives related to debt (2,345)   (1,738)    
Future interest commitments (77)   (68)    
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 $ (2,422)   $ (1,806)    
Commercial Banks | Liquidity risk          
Disclosure of nature and extent of risks arising from financial instruments [line items]          
Concentration risk percentage 34.00%   30.00%    
Bonds | Liquidity risk          
Disclosure of nature and extent of risks arising from financial instruments [line items]          
Concentration risk percentage 54.00%   57.00%    
Development Finance Institutions | Liquidity risk          
Disclosure of nature and extent of risks arising from financial instruments [line items]          
Concentration risk percentage 4.00%   3.00%    
Finance lease liabilities | Liquidity risk          
Disclosure of nature and extent of risks arising from financial instruments [line items]          
Concentration risk percentage 8.00%   10.00%    
[1] Re-presented for discontinued operations (shown in note A.4. and E.3.2.). Not restated for the application of IFRS 15 and 9, as the Group elected the modified retrospective approach for both standards.
[2] Not restated for the application of IFRS 15 and 9, as the Group elected the modified retrospective approach for both standards.