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Capital structure and financing - C.6. Net finnacial obligations, table 2 (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Changes in liabilities arising from financing activities [abstract]    
Interest accretion, liabilities arising form financing activities $ 20 $ 17
Transfers, liabilities arising form financing activities (14) 3
Other non-cash movements, liabilities arising form financing activities (36) (10)
Changes In Net Debt [Abstract]    
Net debt 5,837 5,902
Cash flows, net debt 1,780 (117)
Scope changes, net debt 414  
Additions/acquisitions, net debt 123 68
Foreign exchange movements, net debt (142) (26)
Net debt 7,981 5,837
Bond and bank debt and financing    
Changes in liabilities arising from financing activities [abstract]    
Liabilities arising from financing activities, beginning of period 5,691 5,972
Cash flows, liabilities arising form financing activities 1,779 (274)
Scope changes, liabilities arising form financing activities 413  
Acquisition of subsidiaries, joint ventures and associates, net of cash acquired 0 0
Interest accretion, liabilities arising form financing activities 20 16
Foreign exchange movements, liabilities arising form financing activities (108) (10)
Transfers, liabilities arising form financing activities (15) (3)
Other non-cash movements, liabilities arising form financing activities (36) (10)
Liabilities arising from financing activities, end of period 7,744 5,691
Lease liabilities [member]    
Changes in liabilities arising from financing activities [abstract]    
Liabilities arising from financing activities, beginning of period 1,021 1,096
Cash flows, liabilities arising form financing activities (137) (116)
Scope changes, liabilities arising form financing activities 204  
Acquisition of subsidiaries, joint ventures and associates, net of cash acquired 123 68
Interest accretion, liabilities arising form financing activities 0 1
Foreign exchange movements, liabilities arising form financing activities (44) (34)
Transfers, liabilities arising form financing activities 1 6
Other non-cash movements, liabilities arising form financing activities 0 0
Liabilities arising from financing activities, end of period 1,167 1,021
Cash and cash equivalents    
Assets For Calculation Of Net Debt [Abstract]    
Assets, beginning of period 875 1,164
Cash flows, assets (169) (272)
Additions/acquisitions, assets 0 0
Foreign exchange movements, assets (10) (17)
Assets, end of period 895 875
Changes In Net Debt [Abstract]    
Scope changes, net debt 199  
Other    
Assets For Calculation Of Net Debt [Abstract]    
Assets, beginning of period 0 2
Cash flows, assets 31 (2)
Foreign exchange movements, assets   0
Assets, end of period 35 $ 0
Changes In Net Debt [Abstract]    
Scope changes, net debt $ 4