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Supplementary Financial Information - Other Non-Current Assets (Details) - USD ($)
$ in Millions
12 Months Ended
Oct. 31, 2018
Oct. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Tax indemnifications receivable $ 953 $ 1,695
Deferred tax assets 2,431 342
Other 1,685 1,058
Other non-current assets, total 5,069 3,095
Adjustment to indemnification receivable 676  
Intangible assets 453 3
Available-for-sale investments $ 53 $ 61