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Stockholders' Equity - Reclassifications (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Apr. 30, 2017
Apr. 30, 2016
Apr. 30, 2017
Apr. 30, 2016
Taxes on change in net unrealized (losses) gains on available-for-sale securities:        
Tax provision on net unrealized (losses) gains arising during the period $ 0 $ (2) $ (1) $ (1)
Tax provision (benefit) on (gains) losses reclassified into earnings 0 1 0 (2)
Taxes effect on change in unrealized gains on available-for-sales securities 0 (1) (1) (3)
Taxes on change in net unrealized losses on cash flow hedges:        
Tax benefit (provision) on net unrealized gains (losses) arising during the period 4 46 (27) 31
Tax provision on net gains reclassified into earnings 13 6 45 25
Taxes effect on change in unrealized losses on cash flow hedges 17 52 18 56
Taxes on change in unrealized components of defined benefit plans:        
Tax provision on gains (losses) arising during the period (1) 0 (25) 0
Tax benefit on amortization of actuarial loss and prior service benefit (5) (5) (11) (10)
Tax provision on curtailments, settlements and other (7) (11) (14) (12)
Tax effect on change in unrealized components of defined benefit plans (13) (16) (50) (22)
Tax benefit on change in cumulative translation adjustment 0 42 1 22
Tax benefit (provision) on other comprehensive income 4 77 (32) 53
Changes and reclassifications related to other comprehensive loss, net of taxes        
Comprehensive income 1 (75) 476 (152)
Change in net unrealized (losses) gains on available-for-sale securities:        
Changes and reclassifications related to other comprehensive loss, net of taxes        
Net unrealized (losses) gains arising during the period (4) 0 (18) 3
Reclassifications of losses (gains) into earnings 0 (4) 0 2
Comprehensive income (4) (4) (18) 5
Change in net unrealized losses on cash flow hedges:        
Changes and reclassifications related to other comprehensive loss, net of taxes        
Net unrealized (losses) gains arising during the period 8 (160) 113 (33)
Reclassifications of losses (gains) into earnings     (201)  
Comprehensive income (62) (224) (88) (199)
Change in net unrealized losses on cash flow hedges: | Reclassifications of gains (losses) into earnings        
Changes and reclassifications related to other comprehensive loss, net of taxes        
Reclassifications of losses (gains) into earnings (70) (64) (201) (166)
Unrealized components of defined benefit plans        
Changes and reclassifications related to other comprehensive loss, net of taxes        
Net unrealized (losses) gains arising during the period     465  
Reclassifications of losses (gains) into earnings     152  
Comprehensive income 78 54 617 102
Gains (losses) arising during the period | Reclassifications of gains (losses) into earnings        
Changes and reclassifications related to other comprehensive loss, net of taxes        
Reclassifications of losses (gains) into earnings 10 (1) 465 (1)
Amortization of actuarial loss and prior service benefit | Reclassifications of gains (losses) into earnings        
Changes and reclassifications related to other comprehensive loss, net of taxes        
Reclassifications of losses (gains) into earnings 72 65 163 132
Curtailments, settlements and other        
Changes and reclassifications related to other comprehensive loss, net of taxes        
Comprehensive income (4) (10) (11) (29)
Change in cumulative translation adjustment        
Changes and reclassifications related to other comprehensive loss, net of taxes        
Net unrealized (losses) gains arising during the period     (35)  
Reclassifications of losses (gains) into earnings     0  
Comprehensive income $ (11) $ 99 $ (35) $ (60)