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Goodwill and acquisition-related intangibles - Components of Acquisition Related Intangible Assets (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2020
Dec. 31, 2019
Acquired Finite-Lived Intangible Assets [Line Items]    
Acquisition-related intangibles, net $ 189 $ 340
Developed technology    
Acquired Finite-Lived Intangible Assets [Line Items]    
Acquisition-related intangibles, gross carrying amount 1,895 2,000
Acquisition-related intangibles, accumulated amortization 1,706 1,660
Acquisition-related intangibles, net $ 189 $ 340
Developed technology | Minimum    
Acquired Finite-Lived Intangible Assets [Line Items]    
Acquisition-related intangibles, amortization period 8 years  
Developed technology | Maximum    
Acquired Finite-Lived Intangible Assets [Line Items]    
Acquisition-related intangibles, amortization period 10 years