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Segment Information - Reconciliation of Segment Operating Results (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Apr. 30, 2025
Apr. 30, 2024
Apr. 30, 2025
Apr. 30, 2024
Net Revenue:        
Net revenue $ 7,627 $ 7,204 $ 15,481 $ 13,959
(Loss) Earnings Before Taxes:        
Total segment earnings from operations (1,109) 425 (676) 950
Amortization of intangible assets (37) (67) (75) (138)
Transformation (credit) costs 13 (33) (2) (53)
Gain on sale of a business 0 0 244 0
H3C divestiture related severance costs (20) 0 (97) 0
Cost reduction program (146) 0 (146) 0
Acquisition, disposition and other charges (55) (46) (121) (89)
Interest and other, net 39 (22) 78 (110)
Earnings from equity interests 25 42 42 88
(Loss) earnings before provision for taxes (1,045) 445 (312) 928
Impairment of goodwill (1,400)      
Operating Segment        
Net Revenue:        
Net revenue 7,723 7,328 15,634 14,240
(Loss) Earnings Before Taxes:        
Total segment earnings from operations 672 745 1,513 1,592
Elimination of intersegment net revenue and other        
Net Revenue:        
Net revenue (96) (124) (153) (281)
Segment Reconciling Items        
(Loss) Earnings Before Taxes:        
Unallocated corporate costs and eliminations (59) (61) (120) (133)
Stock-based compensation expense (116) (120) (270) (261)
Amortization of intangible assets (37) (67) (75) (138)
Transformation (credit) costs 13 (33) (2) (53)
Acquisition, disposition and other charges (55) (39) (118) (57)
Interest and other, net 39 (22) 78 (110)
Earnings from equity interests 25 42 42 88
Impairment of goodwill $ (1,361) $ 0 $ (1,361) $ 0