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Stockholders' Equity (Details) - USD ($)
$ in Millions
12 Months Ended
Oct. 31, 2016
Oct. 31, 2015
Oct. 31, 2014
Taxes on change in net unrealized (losses) gains on available-for-sale securities:      
Tax benefit (provision) on net unrealized (losses) gains arising during the period $ 2 $ 2 $ (1)
Tax benefit on losses reclassified into earnings (2) 0 0
Taxes effect on change in unrealized (losses) gains on available-for-sales securities 0 2 (1)
Taxes on change in net unrealized (losses) gains on cash flow hedges:      
Tax provision on net unrealized gains arising during the period (14) (69) (32)
Tax provision on net (gains) losses reclassified into earnings 25 76 1
Taxes effect on change in unrealized gains (losses) on cash flow hedges 11 7 (31)
Taxes on change in unrealized components of defined benefit plans:      
Tax benefit on losses arising during the period 63 30 58
Tax benefit on amortization of actuarial loss and prior service benefit (20) (10) (6)
Tax provision on curtailments, settlements and other (1) 0 (3)
Tax benefit on Plans transferred from former Parent during the period 0 255 0
Tax effect on change in unrealized components of defined benefit plans 42 275 49
Tax on cumulative translation adjustment arising during the period 20 (73) (27)
Tax on release of cumulative translation adjustment as a result of H3C and MphasiS divestitures (22) 0 0
Taxes on change in cumulative translation adjustment: (2) (73) (27)
Tax benefit (provision) on other comprehensive loss 51 211 (10)
Changes and reclassifications related to Other Comprehensive (Loss) Income, net of taxes      
Other comprehensive (loss) income before reclassifications (1,657)    
Reclassifications of (gains) losses into earnings 73    
Other comprehensive (loss) income, net of taxes (1,584) (2,767) (553)
Cumulative translation adjustment arising during the period (134) (271) (112)
Release of cumulative translation adjustment as a result of H3C and MphasiS divestitures 53 0 0
Change in foreign currency translation adjustment (81) (271) (112)
Change in net unrealized (losses) gains on available-for-sale securities:      
Changes and reclassifications related to Other Comprehensive (Loss) Income, net of taxes      
Other comprehensive (loss) income before reclassifications (2) (8) 4
Reclassifications of (gains) losses into earnings 1    
Other comprehensive (loss) income, net of taxes (1) (8) 3
Change in net unrealized (losses) gains on available-for-sale securities: | Reclassifications of losses (gains) into earnings      
Changes and reclassifications related to Other Comprehensive (Loss) Income, net of taxes      
Reclassifications of (gains) losses into earnings 1 0 (1)
Net unrealized gains (losses) on cash flow hedges      
Changes and reclassifications related to Other Comprehensive (Loss) Income, net of taxes      
Other comprehensive (loss) income before reclassifications 212 412 79
Reclassifications of (gains) losses into earnings (245)    
Other comprehensive (loss) income, net of taxes (33) 8 140
Net unrealized gains (losses) on cash flow hedges | Reclassifications of losses (gains) into earnings      
Changes and reclassifications related to Other Comprehensive (Loss) Income, net of taxes      
Reclassifications of (gains) losses into earnings (245) (404) 61
Net unrealized gains (losses) on cash flow hedges | Reclassifications of losses (gains) into earnings | Cash flow hedges      
Changes and reclassifications related to Other Comprehensive (Loss) Income, net of taxes      
Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion) (270) (480) 60
Net unrealized gains (losses) on cash flow hedges | Reclassifications of losses (gains) into earnings | Cash flow hedges | Net revenue      
Changes and reclassifications related to Other Comprehensive (Loss) Income, net of taxes      
Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion) (19) (276) 4
Net unrealized gains (losses) on cash flow hedges | Reclassifications of losses (gains) into earnings | Cash flow hedges | Cost of products      
Changes and reclassifications related to Other Comprehensive (Loss) Income, net of taxes      
Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion) 0 (6) (3)
Net unrealized gains (losses) on cash flow hedges | Reclassifications of losses (gains) into earnings | Cash flow hedges | Other operating expenses      
Changes and reclassifications related to Other Comprehensive (Loss) Income, net of taxes      
Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion) 0 4 9
Net unrealized gains (losses) on cash flow hedges | Reclassifications of losses (gains) into earnings | Cash flow hedges | Gain on MphasiS divestiture      
Changes and reclassifications related to Other Comprehensive (Loss) Income, net of taxes      
Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion) (8) 0 0
Net unrealized gains (losses) on cash flow hedges | Reclassifications of losses (gains) into earnings | Cash flow hedges | Interest and other, net      
Changes and reclassifications related to Other Comprehensive (Loss) Income, net of taxes      
Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion) (243) (202) 50
Change in unrealized components of defined benefit plans:      
Changes and reclassifications related to Other Comprehensive (Loss) Income, net of taxes      
Other comprehensive (loss) income before reclassifications (1,733)    
Reclassifications of (gains) losses into earnings 264    
Other comprehensive (loss) income, net of taxes (1,469) (2,496) (584)
Losses arising during the period      
Changes and reclassifications related to Other Comprehensive (Loss) Income, net of taxes      
Other comprehensive (loss) income before reclassifications (1,714) (352) (736)
Amortization of actuarial loss and prior service benefit | Reclassifications of losses (gains) into earnings      
Changes and reclassifications related to Other Comprehensive (Loss) Income, net of taxes      
Reclassifications of (gains) losses into earnings 264 204 76
Curtailments, settlements and other      
Changes and reclassifications related to Other Comprehensive (Loss) Income, net of taxes      
Other comprehensive (loss) income, net of taxes (19) 4 15
Plans transferred from former Parent during the period      
Changes and reclassifications related to Other Comprehensive (Loss) Income, net of taxes      
Other comprehensive (loss) income, net of taxes 0 (2,352) 0
Merged into Parent's Shared plan during the period      
Changes and reclassifications related to Other Comprehensive (Loss) Income, net of taxes      
Other comprehensive (loss) income, net of taxes 0 $ 0 $ 61
Cumulative translation adjustment      
Changes and reclassifications related to Other Comprehensive (Loss) Income, net of taxes      
Other comprehensive (loss) income before reclassifications (134)    
Reclassifications of (gains) losses into earnings $ 53