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Goodwill and Acquisition-Related Intangibles - Components of Acquisition Related Intangible Assets (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Acquired Finite Lived Intangible Assets [Line Items]    
Acquisition-related intangibles, gross carrying amount $ 2,940 $ 2,940
Acquisition-related intangibles, accumulated amortization 1,994 1,676
Acquisition-related intangibles, net 946 1,264
Finite-Lived Intangible Assets, Future Amortization Expense [Abstract]    
2018 318  
2019 288  
2020 198  
2021 142  
Developed technology    
Acquired Finite Lived Intangible Assets [Line Items]    
Acquisition-related intangibles, gross carrying amount 2,130 2,130
Acquisition-related intangibles, accumulated amortization 1,361 1,144
Acquisition-related intangibles, net $ 769 986
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 $ 810 810
Acquisition-related intangibles, accumulated amortization 633 532
Acquisition-related intangibles, net $ 177 $ 278