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Significant transactions (Details) - USD ($)
6 Months Ended
May 27, 2020
Apr. 02, 2019
Mar. 13, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Sep. 23, 2019
Apr. 09, 2019
Disclosure of detailed information about business combination [line items]                
Proceeds from borrowings   $ 3,200,000,000            
Financial debts   3,500,000,000   $ 4,144,000,000   $ 3,479,000,000    
Cash paid for intercompany transactions related to spin-off   $ 3,100,000,000            
Net assets               $ 20,000,000,000.0
Consideration paid (received)       $ 0 $ 283,000,000      
PowerVision, Inc.                
Disclosure of detailed information about business combination [line items]                
Percentage of voting equity interests acquired     100.00%          
Consideration transferred, acquisition-date fair value     $ 424,000,000          
Cash transferred     289,000,000          
Contingent liabilities recognised as of acquisition date     135,000,000          
Identifiable assets acquired (liabilities assumed)     418,000,000          
Identifiable intangible assets recognised as of acquisition date     505,000,000          
Deferred tax liabilities recognised as of acquisition date     93,000,000          
Other net assets recognised as of acquisition date     6,000,000          
Goodwill recognised as of acquisition date     6,000,000          
Consideration paid (received)     $ 283,000,000          
Series 2030 notes                
Disclosure of detailed information about business combination [line items]                
Proceeds from borrowings $ 750,000,000              
Borrowings, interest rate 2.60%              
Notional amount $ 750,000,000              
Senior notes                
Disclosure of detailed information about business combination [line items]                
Notional amount             $ 2,000,000,000  
Series 2026 notes                
Disclosure of detailed information about business combination [line items]                
Borrowings, interest rate             2.75%  
Notional amount             $ 500,000,000  
Series 2029 notes                
Disclosure of detailed information about business combination [line items]                
Borrowings, interest rate             3.00%  
Notional amount             $ 1,000,000,000  
Series 2049 notes                
Disclosure of detailed information about business combination [line items]                
Borrowings, interest rate             3.80%  
Notional amount             $ 500,000,000