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ACQUISITIONS (Allocation of Purchase Price) (Details) - USD ($) | Oct. 31, 2019 | Jun. 14, 2019 | Oct. 31, 2018 | Oct. 31, 2017 | Apr. 18, 2017
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Business Acquisition [Line Items] |  |  |  |  |
Goodwill | $ 1,209,000,000 |  | $ 1,171,000,000 | $ 1,882,000,000 |
Prisma [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Cash and cash equivalents |  | $ 56,000,000 |  |  |
Goodwill |  | 30,000,000 |  |  |
Intangible assets |  | $ 56,000,000 |  |  |
Ixia [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Cash and cash equivalents |  |  |  |  | $ 72,000,000
Short-term investments |  |  |  |  | 44,000,000
Accounts receivable |  |  |  |  | 91,000,000
Inventory |  |  |  |  | 107,000,000
Other current assets |  |  |  |  | 34,000,000
Property, plant and equipment |  |  |  |  | 50,000,000
Goodwill |  |  |  |  | 1,117,000,000
Intangible assets |  |  |  |  | 744,000,000
Other assets |  |  |  |  | 4,000,000
Total assets acquired |  |  |  |  | 2,263,000,000
Accounts payable |  |  |  |  | (10,000,000)
Employee compensation and benefits |  |  |  |  | (32,000,000)
Deferred revenue |  |  |  |  | (35,000,000)
Income and other taxes payable |  |  |  |  | (1,000,000)
Other accrued liabilities |  |  |  |  | (32,000,000)
Other long-term liabilities |  |  |  |  | (459,000,000)
Net assets acquired |  |  |  |  | $ 1,694,000,000

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