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Performance B.6.3 Deferred tax (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2018
Dec. 31, 2016
Reconciliation of changes in deferred tax liability (asset) [abstract]        
Beginning of period $ 124 $ 109    
(Charge)/credit to statement of income 33 13    
Change in scope (181)      
Accounting policy changes 4      
Exchange differences (11) 2    
End of period (31) 124    
Deferred tax assets 202 180 $ 191  
Deferred tax liabilities (233) (56) [1] $ (62)  
Deductible temporary differences 5,112 5,074    
Temporary differences associated with investments in subsidiaries, branches and associates and interests in joint arrangements for which deferred tax liabilities have not been recognised 584 842   $ 873
Unrecognized tax losses 4,886 4,844   4,501
Deferred tax assets, intragroup dividends 34 32   32
Offset        
Reconciliation of changes in deferred tax liability (asset) [abstract]        
Deferred tax assets (52) (39)    
Deferred tax liabilities 52 39    
Fixed assets        
Reconciliation of changes in deferred tax liability (asset) [abstract]        
Beginning of period 32 (23)    
(Charge)/credit to statement of income (18) 53    
Change in scope (190)      
Accounting policy changes 0      
Exchange differences 0 2    
End of period (176) 32    
Deductible temporary differences 92 68    
Fixed assets | Before Offset        
Reconciliation of changes in deferred tax liability (asset) [abstract]        
Deferred tax assets 76 88    
Deferred tax liabilities (252) (56)    
Unused tax losses        
Reconciliation of changes in deferred tax liability (asset) [abstract]        
Beginning of period 52 113    
(Charge)/credit to statement of income (3) (61)    
Change in scope 0      
Accounting policy changes 0      
Exchange differences (5) 0    
End of period 44 52    
Deductible temporary differences 4,886 4,844    
Unused tax losses | Before Offset        
Reconciliation of changes in deferred tax liability (asset) [abstract]        
Deferred tax assets 44 52    
Deferred tax liabilities 0 0    
Unremitted earnings        
Reconciliation of changes in deferred tax liability (asset) [abstract]        
Beginning of period (32) (32)    
(Charge)/credit to statement of income (2) 1    
Change in scope 0      
Accounting policy changes 0      
Exchange differences 0 (1)    
End of period (34) (32)    
Unremitted earnings | Before Offset        
Reconciliation of changes in deferred tax liability (asset) [abstract]        
Deferred tax assets 0 0    
Deferred tax liabilities (34) (32)    
Other        
Reconciliation of changes in deferred tax liability (asset) [abstract]        
Beginning of period 72 51    
(Charge)/credit to statement of income 56 20    
Change in scope 9      
Accounting policy changes 4      
Exchange differences (6) 1    
End of period 135 72    
Deductible temporary differences 134 162    
Other | Before Offset        
Reconciliation of changes in deferred tax liability (asset) [abstract]        
Deferred tax assets 134 79    
Deferred tax liabilities 1 (7)    
Less than 1 year        
Reconciliation of changes in deferred tax liability (asset) [abstract]        
Unrecognized tax losses 0 39   27
1 to 5 years        
Reconciliation of changes in deferred tax liability (asset) [abstract]        
Unrecognized tax losses 3 494   493
After five years        
Reconciliation of changes in deferred tax liability (asset) [abstract]        
Unrecognized tax losses 493 0   0
No expiry        
Reconciliation of changes in deferred tax liability (asset) [abstract]        
Unrecognized tax losses $ 4,390 $ 4,311   $ 3,981
[1] Not restated for the application of IFRS 15 and 9, as the Group elected the modified retrospective approach for both standards.