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Stockholders' Deficit - Accumulated Other Comprehensive Income (Loss), Net of Taxes (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Apr. 30, 2023
Apr. 30, 2022
Apr. 30, 2023
Apr. 30, 2022
Components of accumulated other comprehensive income, net of taxes        
Balance at beginning of period $ (3,730) $ (2,328) $ (2,918) $ (1,650)
Other comprehensive gain (loss) before reclassifications     (546)  
Reclassifications of gain into earnings     (135)  
Balance at end of period (2,484) (1,898) (2,484) (1,898)
Accumulated other comprehensive income (loss)        
Components of accumulated other comprehensive income, net of taxes        
Balance at beginning of period (456) (16) 313 (260)
Balance at end of period (368) 347 (368) 347
Net unrealized gains (losses) on available-for-sale debt securities        
Components of accumulated other comprehensive income, net of taxes        
Balance at beginning of period     6  
Other comprehensive gain (loss) before reclassifications 0 (3) 3 (5)
Reclassifications of gain into earnings     0  
Balance at end of period 9   9  
Net unrealized gains (losses) on cash flow hedges        
Components of accumulated other comprehensive income, net of taxes        
Balance at beginning of period     648  
Other comprehensive gain (loss) before reclassifications (46) 489 (563) 756
Reclassifications of gain into earnings 121 $ (96) (135) $ (128)
Balance at end of period (50)   (50)  
Unrealized components of defined benefit plans        
Components of accumulated other comprehensive income, net of taxes        
Balance at beginning of period     (295)  
Other comprehensive gain (loss) before reclassifications     (24)  
Reclassifications of gain into earnings     0  
Balance at end of period (319)   (319)  
Change in cumulative translation adjustment        
Components of accumulated other comprehensive income, net of taxes        
Balance at beginning of period     (46)  
Other comprehensive gain (loss) before reclassifications     38  
Reclassifications of gain into earnings     0  
Balance at end of period $ (8)   $ (8)