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Capital structure and financing - C.6. Net finnacial obligations, table 2 (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Changes in liabilities arising from financing activities [abstract]    
Interest accretion, liabilities arising form financing activities $ 17 $ 8
Transfers, liabilities arising form financing activities 3 3
Other non-cash movements, liabilities arising form financing activities (10) (14)
Changes In Net Debt [Abstract]    
Net debt 5,902 4,596
Cash flows, net debt (121) 998
Scope changes, net debt 0 269
Additions/acquisitions, net debt 68 109
Foreign exchange movements, net debt (22) (14)
Transfers (to)/from assets held for sale, net debt 0 (52)
Net debt 5,837 5,902
Bond and bank debt and financing    
Changes in liabilities arising from financing activities [abstract]    
Liabilities arising from financing activities, beginning of period 5,972 4,227
Cash flows, liabilities arising form financing activities (274) 1,743
Scope changes, liabilities arising form financing activities 0 74
Acquisition of subsidiaries, joint ventures and associates, net of cash acquired 0 0
Interest accretion, liabilities arising form financing activities 16 8
Foreign exchange movements, liabilities arising form financing activities (10) (16)
Transfers (to)/from assets held for sale, liabilities arising form financing activities 0 (53)
Transfers, liabilities arising form financing activities (3) 3
Other non-cash movements, liabilities arising form financing activities (10) (14)
Liabilities arising from financing activities, end of period 5,691 5,972
Lease liabilities [member]    
Changes in liabilities arising from financing activities [abstract]    
Liabilities arising from financing activities, beginning of period 1,096 898
Cash flows, liabilities arising form financing activities (121) (107)
Scope changes, liabilities arising form financing activities 0 210
Acquisition of subsidiaries, joint ventures and associates, net of cash acquired 68 109
Interest accretion, liabilities arising form financing activities 1 0
Foreign exchange movements, liabilities arising form financing activities (30) (6)
Transfers (to)/from assets held for sale, liabilities arising form financing activities 0 (8)
Transfers, liabilities arising form financing activities 6 0
Other non-cash movements, liabilities arising form financing activities 0 0
Liabilities arising from financing activities, end of period 1,021 1,096
Cash and cash equivalents    
Assets For Calculation Of Net Debt [Abstract]    
Assets, beginning of period 1,164 528
Cash flows, assets (272) 638
Additions/acquisitions, assets 0 0
Foreign exchange movements, assets (17) (8)
Transfers (to)/from assets held for sale. assets 0 (9)
Assets, end of period 875 1,164
Changes in liabilities arising from financing activities [abstract]    
Scope changes, liabilities arising form financing activities   16
Changes In Net Debt [Abstract]    
Scope changes, net debt 0  
Other    
Assets For Calculation Of Net Debt [Abstract]    
Assets, beginning of period 2 2
Cash flows, assets (2) 0
Foreign exchange movements, assets   0
Transfers (to)/from assets held for sale. assets   0
Assets, end of period 0 2
Changes in liabilities arising from financing activities [abstract]    
Scope changes, liabilities arising form financing activities   $ 0
Changes In Net Debt [Abstract]    
Scope changes, net debt $ 0