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Stockholders' Equity (Tables)
6 Months Ended
Apr. 30, 2021
Equity [Abstract]  
Components of Accumulated Other Comprehensive Loss, Net of Taxes
The components of Accumulated other comprehensive loss, net of taxes as of April 30, 2021, and changes during the six months ended April 30, 2021 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$18 $(7)$(3,473)$(477)$(3,939)
Other comprehensive income (loss) before reclassifications(2)(284)23 18 (245)
Reclassifications of (gains) losses into earnings— 298 144 — 442 
Tax (provision) benefit— (5)(11)(4)(20)
Balance at end of period$16 $$(3,317)$(463)$(3,762)
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 — (10)— (33)(43)
Other comprehensive income (loss) before reclassifications(6)371 (47)327 
Reclassifications of (gains) losses into earnings(7)(283)123 — (167)
Tax (provision) benefit— (11)(8)(15)
Balance at end of period$10 $120 $(3,242)$(513)$(3,625)