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Stockholders' Equity (Details) - USD ($)
shares in Millions, $ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Jul. 31, 2015
Jul. 31, 2014
Jul. 31, 2015
Jul. 31, 2014
Oct. 31, 2011
Stockholders' Equity          
Repurchases of common stock (in shares) 11 16 65 64  
Payment in connection with repurchases of shares $ 400 $ 600 $ 2,582 $ 1,978  
Share repurchase authorization remaining 2,300   2,300    
Share repurchase authorization increase after balance sheet date         $ 10,000
Tax effects on change in unrealized gains (losses) on available-for-sale securities:          
Tax (provision) benefit on unrealized gains (losses) arising during the period (3) 1      
Tax benefit on unrealized (losses) gains arising during the period (3) 1      
Tax effects on change in unrealized gains (losses) on cash flow hedges:          
Tax provision on unrealized gains (losses) arising during the period (89) (52) (270) (17)  
Tax provision (benefit) on (gains) losses reclassified into earnings 48 (21) 303 (84)  
Tax effects on change in unrealized gains (losses) on cash flow hedges (41) (73) 33 (101)  
Tax effects on change in unrealized components of defined benefit plans:          
Tax (provision) benefit on losses arising during the period (65) (13) (65) 8  
Tax benefit on amortization of actuarial loss and prior service benefit (8) (2) (21) (16)  
Tax benefit (provision) on curtailments, settlements and other 30   29 (7)  
Tax effect on change in unrealized components of defined benefit plans (43) (15) (57) (15)  
Tax benefit (provision) on change in cumulative translation adjustment 18 1 26 (7)  
Tax provision on other comprehensive income (69) (86) (50) (123)  
Changes and reclassifications related to Other Comprehensive Income, net of taxes          
Amounts reclassified from accumulated other comprehensive income     443    
Other comprehensive (loss) income, before reclassification     476    
Other comprehensive income (loss), net of taxes 154 219 33 168  
Total 159 (125) 1,049 (335)  
Cash flow hedges          
Changes and reclassifications related to Other Comprehensive Income, net of taxes          
Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion) (159) 125 (1,049) 335  
Change in unrealized gains (losses) on available-for-sale securities          
Changes and reclassifications related to Other Comprehensive Income, net of taxes          
Other comprehensive (loss) income, before reclassification 1 8 (9) 6  
Other comprehensive income (loss), net of taxes 1 8 (9) 5  
Change in unrealized gains (losses) on available-for-sale securities | Reclassifications of losses (gains) into earnings          
Changes and reclassifications related to Other Comprehensive Income, net of taxes          
Amounts reclassified from accumulated other comprehensive income       (1)  
Change in net unrealized gains (losses) on cash flow hedges          
Changes and reclassifications related to Other Comprehensive Income, net of taxes          
Amounts reclassified from accumulated other comprehensive income     746    
Other comprehensive (loss) income, before reclassification 203 82 635 (122)  
Other comprehensive income (loss), net of taxes 92 186 (111) 129  
Change in net unrealized gains (losses) on cash flow hedges | Reclassifications of losses (gains) into earnings          
Changes and reclassifications related to Other Comprehensive Income, net of taxes          
Amounts reclassified from accumulated other comprehensive income (111) 104 (746) 251  
Change in net unrealized gains (losses) on cash flow hedges | Reclassifications of losses (gains) into earnings | Cash flow hedges          
Changes and reclassifications related to Other Comprehensive Income, net of taxes          
Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion) (159) 125 (1,049) 355  
Change in 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 Income, net of taxes          
Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion) (177) 103 (1,044) 229  
Change in 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 Income, net of taxes          
Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion) 44 12 113 56  
Change in 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 Income, net of taxes          
Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)     7 7  
Change in 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 Income, net of taxes          
Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion) (26) 10 (125) 43  
Change in unrealized components of defined benefit plans          
Changes and reclassifications related to Other Comprehensive Income, net of taxes          
Amounts reclassified from accumulated other comprehensive income     (303)    
Other comprehensive (loss) income, before reclassification     (12)    
Other comprehensive income (loss), net of taxes 87 46 291 104  
Amortization of actuarial loss and prior service benefit | Reclassifications of losses (gains) into earnings          
Changes and reclassifications related to Other Comprehensive Income, net of taxes          
Amounts reclassified from accumulated other comprehensive income 100 65 303 180  
Curtailments, settlements and other          
Changes and reclassifications related to Other Comprehensive Income, net of taxes          
Other comprehensive income (loss), net of taxes 127 2 128 35  
Losses reclassified into earnings          
Changes and reclassifications related to Other Comprehensive Income, net of taxes          
Other comprehensive (loss) income, before reclassification (140) (21) (140) (111)  
Change in cumulative translation adjustment          
Changes and reclassifications related to Other Comprehensive Income, net of taxes          
Other comprehensive (loss) income, before reclassification     (138)    
Other comprehensive income (loss), net of taxes $ (26) $ (21) $ (138) $ (70)