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NEW ACCOUNTING PRONOUNCEMENTS Cumulative effect adjustment from adoption of Topic 606 (Details) - USD ($)
$ in Millions
Apr. 30, 2019
Nov. 01, 2018
Oct. 31, 2018
Assets:      
Accounts receivable, net $ 660 $ 631 $ 624
Other current assets 227 250 222
Long-term deferred tax assets 727 735 750
Other assets 317 282 279
Liabilities:      
Deferred revenue 333 281 334
Income and other taxes payable 61 43 42
Other accrued liabilities 74 76 69
Long-term deferred revenue 150 116 127
Other long-term liabilities 251 290 287
Stockholders' equity:      
Retained earnings 1,555 1,288 1,212
Calculated under Revenue Guidance in Effect before Topic 606 [Member]      
Assets:      
Accounts receivable, net 652   624
Other current assets 202   222
Long-term deferred tax assets 744   750
Other assets 314   279
Liabilities:      
Deferred revenue 397   334
Income and other taxes payable 60   42
Other accrued liabilities 67   69
Long-term deferred revenue 166   127
Other long-term liabilities 248   287
Stockholders' equity:      
Retained earnings 1,468   $ 1,212
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member]      
Assets:      
Accounts receivable, net 8 7  
Other current assets 25 28  
Long-term deferred tax assets (17) (15)  
Other assets 3 3  
Liabilities:      
Deferred revenue (64) (53)  
Income and other taxes payable 1 1  
Other accrued liabilities 7 7  
Long-term deferred revenue (16) (11)  
Other long-term liabilities 3 3  
Stockholders' equity:      
Retained earnings $ 87 $ 76