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Capital structure and financing - C.6. Net finnacial obligations, table 2 (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Changes in liabilities arising from financing activities [abstract]    
Interest accretion, liabilities arising form financing activities $ 8 $ 11
Transfers, liabilities arising form financing activities 3 (9)
Other non-cash movements, liabilities arising form financing activities (14) (19)
Changes In Net Debt [Abstract]    
Net debt 4,051 3,164
Cash flows, net debt 998 676
Scope changes, net debt 236 260
Additions/acquisitions, net debt 109 44
Increase (Decrease) Through Effect Of Change In Accounting Policy, Net Debt 545  
Foreign exchange movements, net debt (14) (72)
Transfers (to)/from assets held for sale, net debt (52) (4)
Net debt 5,870 4,051
Bond and bank debt and financing    
Changes in liabilities arising from financing activities [abstract]    
Liabilities arising from financing activities, beginning of period 4,227 3,420
Cash flows, liabilities arising form financing activities 1,743 621
Scope changes, liabilities arising form financing activities 74 267
Acquisition of subsidiaries, joint ventures and associates, net of cash acquired 0 0
Interest accretion, liabilities arising form financing activities 8 11
Foreign exchange movements, liabilities arising form financing activities (16) (84)
Transfers (to)/from assets held for sale, liabilities arising form financing activities (53) 9
Transfers, liabilities arising form financing activities 3 3
Other non-cash movements, liabilities arising form financing activities (14) (19)
Liabilities arising from financing activities, end of period 5,972 4,227
Finance lease liabilities    
Changes in liabilities arising from financing activities [abstract]    
Liabilities arising from financing activities, beginning of period 353 365
Cash flows, liabilities arising form financing activities 0 (17)
Scope changes, liabilities arising form financing activities 0 0
Acquisition of subsidiaries, joint ventures and associates, net of cash acquired 0 44
Interest accretion, liabilities arising form financing activities   0
Foreign exchange movements, liabilities arising form financing activities 0 (21)
Transfers (to)/from assets held for sale, liabilities arising form financing activities 0 (8)
Transfers, liabilities arising form financing activities (353) (11)
Other non-cash movements, liabilities arising form financing activities   0
Liabilities arising from financing activities, end of period 0 353
Lease liabilities    
Changes in liabilities arising from financing activities [abstract]    
Liabilities arising from financing activities, beginning of period 0 0
Cash flows, liabilities arising form financing activities (107) 0
Scope changes, liabilities arising form financing activities 178 0
Acquisition of subsidiaries, joint ventures and associates, net of cash acquired 109 0
Change in accounting policy 545  
Interest accretion, liabilities arising form financing activities   0
Foreign exchange movements, liabilities arising form financing activities (6) 0
Transfers (to)/from assets held for sale, liabilities arising form financing activities (8) 0
Transfers, liabilities arising form financing activities 353 0
Other non-cash movements, liabilities arising form financing activities 0 0
Liabilities arising from financing activities, end of period 1,063 0
Cash and cash equivalents    
Assets For Calculation Of Net Debt [Abstract]    
Assets, beginning of period 528 619
Cash flows, assets 638 (72)
Additions/acquisitions, assets 0 0
Foreign exchange movements, assets (8) (33)
Transfers (to)/from assets held for sale. assets (9) 6
Assets, end of period 1,164 528
Changes in liabilities arising from financing activities [abstract]    
Scope changes, liabilities arising form financing activities   7
Changes In Net Debt [Abstract]    
Scope changes, net debt 16  
Other    
Assets For Calculation Of Net Debt [Abstract]    
Assets, beginning of period 2 2
Cash flows, assets 0 0
Foreign exchange movements, assets   0
Transfers (to)/from assets held for sale. assets   0
Assets, end of period 2 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