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Performance B.6.3 Deferred tax (Details) - USD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Jan. 01, 2018
Dec. 31, 2017
Reconciliation of changes in deferred tax liability (asset) [abstract]        
Beginning of period $ (34,000,000) $ 124,000,000    
(Charge)/credit to income statement 31,000,000 33,000,000    
Change in scope (73,000,000) (184,000,000)    
Accounting policy changes   4,000,000    
Transfers to assets held for sale (3,000,000)      
Exchange differences 0 (11,000,000)    
End of period (79,000,000) (34,000,000)    
Deferred tax assets 200,000,000 202,000,000 [1],[2] $ 191,000,000 $ 180,000,000
Deferred tax liabilities (279,000,000) (236,000,000) [1],[2] $ (62,000,000) (56,000,000)
Deductible temporary differences 4,923,000,000 5,112,000,000    
Unrecognized tax losses 4,705,000,000 4,886,000,000   4,844,000,000
Temporary differences associated with investments in subsidiaries, branches and associates and interests in joint arrangements for which deferred tax liabilities have not been recognised 697,000,000      
Deferred tax assets, intragroup dividends 26,000,000 34,000,000   32,000,000
Offset        
Reconciliation of changes in deferred tax liability (asset) [abstract]        
Deferred tax assets (52,000,000) (52,000,000)    
Deferred tax liabilities 52,000,000 52,000,000    
Fixed assets        
Reconciliation of changes in deferred tax liability (asset) [abstract]        
Beginning of period (178,000,000) 32,000,000    
(Charge)/credit to income statement 41,000,000 (18,000,000)    
Change in scope (82,000,000) (192,000,000)    
Accounting policy changes   0    
Transfers to assets held for sale 0      
Exchange differences 2,000,000 0    
End of period (217,000,000) (178,000,000)    
Deductible temporary differences 92,000,000 92,000,000    
Fixed assets | Before Offset        
Reconciliation of changes in deferred tax liability (asset) [abstract]        
Deferred tax assets 84,000,000 76,000,000    
Deferred tax liabilities (301,000,000) (254,000,000)    
Unused tax losses        
Reconciliation of changes in deferred tax liability (asset) [abstract]        
Beginning of period 44,000,000 52,000,000    
(Charge)/credit to income statement (15,000,000) (3,000,000)    
Change in scope 5,000,000 0    
Accounting policy changes   0    
Transfers to assets held for sale 0      
Exchange differences 0 (5,000,000)    
End of period 34,000,000 44,000,000    
Deductible temporary differences 4,705,000,000 4,886,000,000    
Unused tax losses | Before Offset        
Reconciliation of changes in deferred tax liability (asset) [abstract]        
Deferred tax assets 34,000,000 44,000,000    
Deferred tax liabilities 0 0    
Unremitted earnings        
Reconciliation of changes in deferred tax liability (asset) [abstract]        
Beginning of period (34,000,000) (32,000,000)    
(Charge)/credit to income statement 8,000,000 (2,000,000)    
Change in scope 0 0    
Accounting policy changes   0    
Transfers to assets held for sale 0      
Exchange differences 0 0    
End of period (26,000,000) (34,000,000)    
Deferred tax liabilities 0 (584,000,000)   (842,000,000)
Unremitted earnings | Before Offset        
Reconciliation of changes in deferred tax liability (asset) [abstract]        
Deferred tax assets 0 0    
Deferred tax liabilities (26,000,000) (34,000,000)    
Other        
Reconciliation of changes in deferred tax liability (asset) [abstract]        
Beginning of period 134,000,000 72,000,000    
(Charge)/credit to income statement (3,000,000) 56,000,000    
Change in scope 4,000,000 8,000,000    
Accounting policy changes   4,000,000    
Transfers to assets held for sale (3,000,000)      
Exchange differences (2,000,000) (6,000,000)    
End of period 130,000,000 134,000,000    
Deductible temporary differences 126,000,000 134,000,000    
Other | Before Offset        
Reconciliation of changes in deferred tax liability (asset) [abstract]        
Deferred tax assets 134,000,000 134,000,000    
Deferred tax liabilities (4,000,000) 0    
Less than 1 year        
Reconciliation of changes in deferred tax liability (asset) [abstract]        
Unrecognized tax losses 1,000,000 0   39,000,000
1 to 5 years        
Reconciliation of changes in deferred tax liability (asset) [abstract]        
Unrecognized tax losses 2,000,000 3,000,000   494,000,000
After five years        
Reconciliation of changes in deferred tax liability (asset) [abstract]        
Unrecognized tax losses 493,000,000 493,000,000   0
No expiry        
Reconciliation of changes in deferred tax liability (asset) [abstract]        
Unrecognized tax losses $ 4,209,000,000 $ 4,390,000,000   $ 4,311,000,000
[1] Not restated for the application of IFRS 16 as the Group elected the modified retrospective approach.
[2] The consolidated statement of financial position at December 31, 2018 has been restated after finalization of the Cable Onda purchase accounting (note A.1.2.).