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Details to the consolidated cash flow statements (Details 5) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Statement [line items]      
Net cash flows $ (9,957) $ (3,760) $ (13,683)
Acquisitions      
Statement [line items]      
Net assets recognized as a result of acquistions of businesses (10,173) (4,124) (13,660)
Fair value of previously held equity interests 7 33  
Contingent consideration payables, net 98 242 (5)
Payments, deferred consideration and other adjustments, net 62 (2) (36)
Net cash flows (10,006) (3,851) (13,701)
Divestments      
Statement [line items]      
Net cash flows $ 49 91 $ 18
Net cash inflows from divestment   95  
Net cash outflows from divestments   4  
Current assets divested   96  
Cash and cash equivalents in subsidiary or businesses acquired or disposed   11  
Divested business   196  
Divestments | Non-current assets [member]      
Statement [line items]      
Divested business   159  
Divestments | Current liabilities [member]      
Statement [line items]      
Liabilities in subsidiary or businesses acquired or disposed   41  
Divestments | Non-current liabilities [member]      
Statement [line items]      
Liabilities in subsidiary or businesses acquired or disposed   $ 18