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Deferred tax assets and liabilities (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Apr. 08, 2019
Dec. 31, 2018
Statement [line items]            
Gross deferred tax assets     $ 8,344 $ 7,952   $ 8,782
Deferred tax assets     8,214 7,909    
Gross deferred tax liabilities     (7,552) (5,910)   (7,558)
Deferred tax liabilities     (7,422) (5,867)    
Net deferred tax balance $ 792 $ 2,042 792 2,042   1,224
Movement in deferred tax balance [roll forward]            
Net deferred tax balance at beginning of period 2,042 1,224        
Credited/(charged) to income 293 354        
Charged to equity 9 (83)        
Credited/(charged) to other comprehensive income (39) (289)        
Impact of business combinations (1,501) (47)        
Other movements (12) 25        
Net deferred tax balance at end of period 792 2,042        
Offsetting of deferred tax assets and liabilities within the same tax jurisdiction     130 43    
Deferred tax assets     8,214 7,909    
Deferred tax liabilities     (7,422) (5,867)    
Property, plant and equipment [member]            
Statement [line items]            
Gross deferred tax assets     189 108   191
Gross deferred tax liabilities     (430) (390)   (622)
Net deferred tax balance (241) (282) (241) (282)   (431)
Movement in deferred tax balance [roll forward]            
Net deferred tax balance at beginning of period (282) (431)        
Credited/(charged) to income 89 74        
Impact of business combinations 5 3        
Other movements (53) (10)        
Net deferred tax balance at end of period (241) (282)        
Intangible assets [member]            
Statement [line items]            
Gross deferred tax assets     1,351 1,469   1,233
Gross deferred tax liabilities     (5,269) (3,610)   (5,384)
Net deferred tax balance (2,141) (4,151) (3,918) (2,141)   (4,151)
Movement in deferred tax balance [roll forward]            
Net deferred tax balance at beginning of period (2,141) (4,151)        
Credited/(charged) to income 110 605        
Charged to equity   8        
Impact of business combinations (1,945) (45)        
Other movements 58 39        
Net deferred tax balance at end of period (3,918) (2,141)        
Pensions and other benefit obligations of associates [member]            
Statement [line items]            
Gross deferred tax assets     1,137 1,078   1,188
Gross deferred tax liabilities     (340) (291)   (273)
Net deferred tax balance 797 915 797 787   915
Movement in deferred tax balance [roll forward]            
Net deferred tax balance at beginning of period 787 915        
Credited/(charged) to income (25) 308        
Credited/(charged) to other comprehensive income (3) (313)        
Other movements 38          
Net deferred tax balance at end of period 797 787        
Inventories [member]            
Statement [line items]            
Gross deferred tax assets     2,502 2,446   3,722
Gross deferred tax liabilities     (159) (287)   (474)
Net deferred tax balance 2,159 2,159 2,343 2,159   3,248
Movement in deferred tax balance [roll forward]            
Net deferred tax balance at beginning of period 2,159 3,248        
Credited/(charged) to income 212 (818)        
Impact of business combinations (3)          
Other movements (25) (23)        
Net deferred tax balance at end of period 2,343 2,159        
Tax loss carryforwards [member]            
Statement [line items]            
Gross deferred tax assets     507 255   273
Gross deferred tax liabilities     (10) (7)    
Net deferred tax balance 497 273 497 248   273
Movement in deferred tax balance [roll forward]            
Net deferred tax balance at beginning of period 248 273        
Credited/(charged) to income (164) (113)        
Charged to equity   75        
Impact of business combinations 408 21        
Other movements 5 31        
Net deferred tax balance at end of period 497 248        
Other assets, provisions and accruals [member]            
Statement [line items]            
Gross deferred tax assets     2,658 2,596   2,175
Gross deferred tax liabilities     (1,344) (1,325)   (805)
Net deferred tax balance 1,271 1,271 $ 1,314 $ 1,271   1,370
Movement in deferred tax balance [roll forward]            
Net deferred tax balance at beginning of period 1,271 1,370        
Credited/(charged) to income 71 298        
Charged to equity 9 (166)        
Credited/(charged) to other comprehensive income (36) 24        
Impact of business combinations 34 (26)        
Other movements (35) (12)        
Net deferred tax balance at end of period $ 1,314 1,271        
Discontinued operations [member]            
Statement [line items]            
Deferred tax assets         $ 732  
Deferred tax liabilities         (1,713)  
Net deferred tax balance   858       858
Movement in deferred tax balance [roll forward]            
Net deferred tax balance at beginning of period   858        
Net deferred tax balance at end of period            
Deferred tax assets         732  
Deferred tax liabilities         $ (1,713)  
Discontinued operations [member] | Property, plant and equipment [member]            
Statement [line items]            
Net deferred tax balance   82       82
Movement in deferred tax balance [roll forward]            
Net deferred tax balance at beginning of period   82        
Net deferred tax balance at end of period            
Discontinued operations [member] | Intangible assets [member]            
Statement [line items]            
Net deferred tax balance   1,403       1,403
Movement in deferred tax balance [roll forward]            
Net deferred tax balance at beginning of period   1,403        
Net deferred tax balance at end of period            
Discontinued operations [member] | Pensions and other benefit obligations of associates [member]            
Statement [line items]            
Net deferred tax balance   (123)       (123)
Movement in deferred tax balance [roll forward]            
Net deferred tax balance at beginning of period   (123)        
Net deferred tax balance at end of period            
Discontinued operations [member] | Inventories [member]            
Statement [line items]            
Net deferred tax balance   (248)       (248)
Movement in deferred tax balance [roll forward]            
Net deferred tax balance at beginning of period   (248)        
Net deferred tax balance at end of period            
Discontinued operations [member] | Tax loss carryforwards [member]            
Statement [line items]            
Net deferred tax balance   (39)       (39)
Movement in deferred tax balance [roll forward]            
Net deferred tax balance at beginning of period   (39)        
Net deferred tax balance at end of period            
Discontinued operations [member] | Other assets, provisions and accruals [member]            
Statement [line items]            
Net deferred tax balance   (217)       $ (217)
Movement in deferred tax balance [roll forward]            
Net deferred tax balance at beginning of period   $ (217)        
Net deferred tax balance at end of period