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Goodwill and acquisition-related intangibles - Components of Acquisition Related Intangible Assets (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Acquired Finite-Lived Intangible Assets [Line Items]    
Acquisition-related intangibles, gross carrying amount $ 2,000 $ 2,935
Acquisition-related intangibles, accumulated amortization 1,610 2,307
Acquisition-related intangibles, net 390 628
Developed technology    
Acquired Finite-Lived Intangible Assets [Line Items]    
Acquisition-related intangibles, gross carrying amount 2,000 2,125
Acquisition-related intangibles, accumulated amortization 1,610 1,573
Acquisition-related intangibles, net $ 390 552
Developed technology | Minimum    
Acquired Finite-Lived Intangible Assets [Line Items]    
Acquisition-related intangibles, amortization period 7 years  
Developed technology | Maximum    
Acquired Finite-Lived Intangible Assets [Line Items]    
Acquisition-related intangibles, amortization period 10 years  
Customer relationships    
Acquired Finite-Lived Intangible Assets [Line Items]    
Acquisition-related intangibles, amortization period 8 years  
Acquisition-related intangibles, gross carrying amount $ 0 810
Acquisition-related intangibles, accumulated amortization 0 734
Acquisition-related intangibles, net $ 0 $ 76