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Capital structure and financing - C.5. Net debt, table 2 (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Changes in liabilities arising from financing activities [abstract]      
Additions, liabilities arising form financing activities $ (43) $ 192 $ 1
Interest accretion, liabilities arising form financing activities 11 7  
Transfers, liabilities arising form financing activities (9) 9  
Other non-cash movements, liabilities arising form financing activities (19) (101)  
Changes In Net Debt [Abstract]      
Net debt 3,164 3,250  
Additions/acquisitions, net debt 44 220  
Cash flows, net debt 676 (209)  
Scope changes, net debt 260    
Foreign exchange movements, net debt (72) 28  
Transfers (to)/from assets held for sale, net debt (4) (42)  
Net debt 4,051 3,164 3,250
Bond and bank debt and financing      
Changes in liabilities arising from financing activities [abstract]      
Liabilities arising from financing activities, beginning of period 3,420 3,606  
Cash flows, liabilities arising form financing activities 621 (177)  
Acquisition of subsidiaries, joint ventures and associates, net of cash acquired   3  
Scope changes, liabilities arising form financing activities 267    
Interest accretion, liabilities arising form financing activities 11 8  
Foreign exchange movements, liabilities arising form financing activities (84) 34  
Transfers (to)/from assets held for sale, liabilities arising form financing activities 9 (49)  
Transfers, liabilities arising form financing activities 3 10  
Other non-cash movements, liabilities arising form financing activities (19) (14)  
Liabilities arising from financing activities, end of period 4,227 3,420 3,606
Finance lease liabilities      
Changes in liabilities arising from financing activities [abstract]      
Liabilities arising from financing activities, beginning of period 365 295  
Cash flows, liabilities arising form financing activities (17) (22)  
Additions, liabilities arising form financing activities 44    
Acquisition of subsidiaries, joint ventures and associates, net of cash acquired   195  
Interest accretion, liabilities arising form financing activities   (1)  
Foreign exchange movements, liabilities arising form financing activities (21) (2)  
Transfers (to)/from assets held for sale, liabilities arising form financing activities (8) (13)  
Transfers, liabilities arising form financing activities (11) 0  
Other non-cash movements, liabilities arising form financing activities   (86)  
Liabilities arising from financing activities, end of period 353 365 295
Cash and cash equivalents      
Assets For Calculation Of Net Debt [Abstract]      
Assets, beginning of period 619 646  
Cash flows, assets (72) 10  
Additions/acquisitions, assets   (22)  
Scope Changes, assets 7    
Foreign exchange movements, assets (33) 4  
Transfers (to)/from assets held for sale. assets 6 (19)  
Assets, end of period 528 619 646
Other      
Assets For Calculation Of Net Debt [Abstract]      
Assets, beginning of period 2 4  
Cash flows, assets   (1)  
Foreign exchange movements, assets   0  
Transfers (to)/from assets held for sale. assets   (2)  
Assets, end of period $ 2 $ 2 $ 4