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Segment Information (Details)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Jul. 31, 2016
USD ($)
Jul. 31, 2015
USD ($)
Jul. 31, 2016
USD ($)
segment
Jul. 31, 2015
USD ($)
Oct. 31, 2015
USD ($)
May 31, 2016
Segment Reporting Information            
Number of segments | segment     5      
Advance royalty proceeds received from intercompany advanced royalty payments and licensing arrangements     $ 3,700   $ 5,000  
Royalty recognition term         5 years  
Percent of China based Enterprise Services, Software and Helion Cloud businesses to be retained (as a percent) 49.00%          
Net revenue $ 12,210 $ 13,057 37,645 $ 38,659    
Segment earnings (loss) from operations 2,497 244 3,373 1,404    
Elimination of intersegment net revenue and other            
Segment Reporting Information            
Net revenue 541 635 1,699 1,760    
Operating segments            
Segment Reporting Information            
Net revenue 12,751 13,692 39,344 40,419    
Segment earnings (loss) from operations 1,336 1,329 3,967 3,924    
Enterprise Group            
Segment Reporting Information            
Net revenue 6,223 6,674 19,689 19,683    
Enterprise Group | Elimination of intersegment net revenue and other            
Segment Reporting Information            
Net revenue 253 333 848 866    
Enterprise Group | Operating segments            
Segment Reporting Information            
Net revenue 6,476 7,007 20,537 20,549    
Segment earnings (loss) from operations 815 881 2,576 2,862    
Enterprise Services            
Segment Reporting Information            
Net revenue 4,534 4,779 13,559 14,179    
Enterprise Services | Elimination of intersegment net revenue and other            
Segment Reporting Information            
Net revenue 191 197 577 607    
Enterprise Services | Operating segments            
Segment Reporting Information            
Net revenue 4,725 4,976 14,136 14,786    
Segment earnings (loss) from operations 393 285 948 607    
Software            
Segment Reporting Information            
Net revenue 666 821 2,089 2,452    
Software | Elimination of intersegment net revenue and other            
Segment Reporting Information            
Net revenue 72 80 203 211    
Software | Operating segments            
Segment Reporting Information            
Net revenue 738 901 2,292 2,663    
Segment earnings (loss) from operations 131 185 459 501    
Financial Services            
Segment Reporting Information            
Net revenue 787 782 2,305 2,339    
Financial Services | Elimination of intersegment net revenue and other            
Segment Reporting Information            
Net revenue 25 25 71 76    
Financial Services | Operating segments            
Segment Reporting Information            
Net revenue 812 807 2,376 2,415    
Segment earnings (loss) from operations 80 87 253 262    
Corporate Investments            
Segment Reporting Information            
Net revenue 0 1 3 6    
Corporate Investments | Elimination of intersegment net revenue and other            
Segment Reporting Information            
Net revenue 0 0 0 0    
Corporate Investments | Operating segments            
Segment Reporting Information            
Net revenue 0 1 3 6    
Segment earnings (loss) from operations $ (83) $ (109) $ (269) $ (308)    
Disposal Group, Held-for-sale, Not Discontinued Operations | MphasiS            
Segment Reporting Information            
Percent of China based Enterprise Services, Software and Helion Cloud businesses to be retained (as a percent)     100.00%      
Disposal Group, Held-for-sale, Not Discontinued Operations | MphasiS | Minimum            
Segment Reporting Information            
Equity sold 84.00%          
Disposal Group, Held-for-sale, Not Discontinued Operations | MphasiS | Maximum            
Segment Reporting Information            
Equity sold 100.00%          
H3C | Unisplendour            
Segment Reporting Information            
Ownership percentage           51.00%