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Capital structure and financing - C.7.3. Equity investments (Details)
£ / shares in Units, $ / shares in Units, £ in Millions, shares in Millions, $ in Millions
 1 Months Ended 12 Months Ended
Oct. 17, 2019
USD ($)
Mar. 31, 2019
USD ($)
Jun. 30, 2020
USD ($)
Jan. 31, 2019
USD ($)
Dec. 31, 2020
USD ($)
shares
Dec. 31, 2020
GBP (£)
shares
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2020
£ / shares
Oct. 31, 2019
USD ($)
Oct. 31, 2019
£ / shares
Oct. 17, 2019
£ / shares
Apr. 11, 2019
$ / shares
Disclosure of fair value measurement of assets [line items]                          
Investments accounted for using equity method         $ 160   $ 371            
Equity Investment In Jumia                          
Disclosure of fair value measurement of assets [line items]                          
Net dilution gain (loss)       $ 7                  
Offer price per share (usd per share) | $ / shares                         $ 14.5
Gain on investment   $ 30                      
Percentage ownership held by non-controlling interest   6.31%                      
Proceeds from sales of investments accounted for using equity method     $ 29                    
Gain on disposal of equity method investment     $ 15                    
Investments accounted for using equity method         0   32            
Change in fair value in investment         $ (18)   $ (38) $ 0          
Equity Investment In HTA                          
Disclosure of fair value measurement of assets [line items]                          
Net dilution gain (loss) $ (3)                        
Offer price per share (usd per share) | £ / shares                     £ 1.15 £ 1.15  
Gain on investment 208                        
Percentage ownership held by non-controlling interest         7.60% 7.60% 16.20%            
Proceeds from sales of investments accounted for using equity method         $ 169 £ 130              
Gain on disposal of equity method investment         6                
Enterprise value                   $ 2,000      
Investments accounted for using equity method $ 292       160   $ 338            
Change in fair value in investment         $ (16)   $ 312 $ 0          
Market capitalization                   $ 1,450      
IPO option rights (as a percentage) 4.00%                        
Disposal of proportion of ownership interest (as a percentage) 20.00%                        
Gross proceeds from disposal $ 57                        
Net proceeds from disposal 25                        
Share in tax escrow 30                        
Loss on disposal $ 32                        
Number of shares sold (in shares) | shares         85 85              
Closing price (in dollars per share) | £ / shares                 £ 1.53