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Goodwill and Acquisition-Related Intangibles - Components of Acquisition Related Intangible Assets (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Acquired Finite Lived Intangible Assets [Line Items]    
Acquisition-related intangibles, gross carrying amount $ 2,940 $ 2,940
Acquisition-related intangibles, accumulated amortization 2,074 1,994
Acquisition-related intangibles, net 866 946
Developed technology    
Acquired Finite Lived Intangible Assets [Line Items]    
Acquisition-related intangibles, gross carrying amount 2,130 2,130
Acquisition-related intangibles, accumulated amortization 1,415 1,361
Acquisition-related intangibles, net $ 715 769
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 659 633
Acquisition-related intangibles, net $ 151 $ 177