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ACQUISITIONS (Intangible Assets Acquired) (Details) - USD ($)
$ in Millions
 12 Months Ended
Jun. 14, 2019
Apr. 18, 2017
Oct. 31, 2019
Acquired Finite-Lived Intangible Assets [Line Items]      
Total intangible assets subject to amortization     $ 56
Prisma [Member]      
Acquired Finite-Lived Intangible Assets [Line Items]      
Total intangible assets $ 56    
Prisma [Member] | Developed Product Technology [Member]      
Acquired Finite-Lived Intangible Assets [Line Items]      
Total intangible assets subject to amortization $ 42    
Finite lived intangible assets useful life 4 years    
Ixia [Member]      
Acquired Finite-Lived Intangible Assets [Line Items]      
Total intangible assets subject to amortization   $ 677  
Total intangible assets   744  
Ixia [Member] | In Process Research and Development [Member]      
Acquired Finite-Lived Intangible Assets [Line Items]      
In-process research and development   67  
Ixia [Member] | Developed Product Technology [Member]      
Acquired Finite-Lived Intangible Assets [Line Items]      
Total intangible assets subject to amortization   $ 423  
Finite lived intangible assets useful life   4 years  
Ixia [Member] | Customer Relationships [Member]      
Acquired Finite-Lived Intangible Assets [Line Items]      
Total intangible assets subject to amortization   $ 234  
Finite lived intangible assets useful life   7 years  
Ixia [Member] | Trademarks and Trade Names [Member]      
Acquired Finite-Lived Intangible Assets [Line Items]      
Total intangible assets subject to amortization   $ 12  
Finite lived intangible assets useful life   3 years  
Ixia [Member] | Backlog [Member]      
Acquired Finite-Lived Intangible Assets [Line Items]      
Total intangible assets subject to amortization   $ 8  
Finite lived intangible assets useful life   90 days