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Stockholders' Equity
6 Months Ended
Apr. 30, 2020
Equity [Abstract]  
Stockholders' Equity Stockholders' Equity
Taxes related to Other Comprehensive Income
 Three months ended April 30,Six months ended April 30,
 2020201920202019
 In millions
Taxes on change in net unrealized gains (losses) on cash flow hedges:  
Tax (provision) benefit on net unrealized gains (losses) arising during the period$(22) $(17) $(32) $(18) 
Tax provision (benefit) on net (gains) losses reclassified into earnings12   21  24  
(10) (9) (11)  
Taxes on change in unrealized components of defined benefit plans:  
Tax (provision) benefit on net unrealized (losses) gains arising during the period—  (2) —   
Tax (provision) benefit on amortization of net actuarial loss and prior service benefit(4) (3) (8) (6) 
Tax benefit (provision) on curtailments, settlements and other  —  (7) 
 (3) (8) (5) 
Tax benefit (provision) on change in cumulative translation adjustment    
Tax (provision) benefit on other comprehensive income$(6) $(8) $(15) $ 

Changes and reclassifications related to Other Comprehensive Income, net of taxes
 Three months ended April 30,Six months ended April 30,
 2020201920202019
 In millions
Other comprehensive income, net of taxes:  
Change in net unrealized (losses) gains on available-for-sale securities:  
Net unrealized (losses) gains arising during the period$(8) $ $(6) $ 
(Gains) losses reclassified into earnings(4) —  (7) (3) 
(12)  (13)  
Change in net unrealized gains (losses) on cash flow hedges:  
Net unrealized gains (losses) arising during the period274  111  339  144  
Net (gains) losses reclassified into earnings(202) (60) (262) (177) 
72  51  77  (33) 
Change in unrealized components of defined benefit plans:  
Net unrealized (losses) gains arising during the period(8)   (39) 
Amortization of net actuarial loss and prior service benefit57  52  114  101  
Curtailments, settlements and other   —  
55  62  124  62  
Change in cumulative translation adjustment(40) (2) (43)  
Other comprehensive income, net of taxes$75  $114  $145  $38  
The components of Accumulated other comprehensive loss, net of taxes as of April 30, 2020, and changes during the six months ended April 30, 2020 were as follows:
 Net unrealized
gains (losses) on
available-for-sale
securities
Net unrealized
gains (losses)
on cash
flow hedges
Unrealized
components
of defined
benefit plans
Cumulative
translation
adjustment
Accumulated
other
comprehensive
loss
 In millions
Balance at beginning of period$23  $53  $(3,366) $(437) $(3,727) 
Effect of change in accounting principle (1)
—  (10) —  (33) (43) 
Other comprehensive (loss) income before reclassifications(6) 339   (43) 299  
Reclassifications of (gains) losses into earnings(7) (262) 115  —  (154) 
Balance at end of period$10  $120  $(3,242) $(513) $(3,625) 

(1)Reflects the adoption of the FASB guidance on stranded tax effects. Refer Note 1 for more information.
Share Repurchase Program
For the six months ended April 30, 2020, the Company repurchased and settled a total of 25.3 million shares under its share repurchase program through open market repurchases, which included 0.5 million shares that were unsettled open market repurchases as of October 31, 2019. As of April 30, 2020, the Company had no unsettled open market repurchases of shares. Shares repurchased during the six months ended April 30, 2020 were recorded as a $346 million reduction to stockholders' equity. As of April 30, 2020, the Company had a remaining authorization of $2.1 billion for future share repurchases.
On April 6, 2020, the Company announced that it suspended purchases under its share repurchase program in response to the global economic uncertainty that resulted from the worldwide spread of COVID-19.