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Stockholders' Equity - Components of AOCI (Details) - USD ($)
$ in Millions
 6 Months Ended
Apr. 30, 2025
Apr. 30, 2024
Components of accumulated other comprehensive loss, net of taxes    
Balance at beginning of period $ 24,880  
Balance at end of period 23,927  
Net unrealized gains (losses) on available-for-sale securities    
Components of accumulated other comprehensive loss, net of taxes    
Balance at beginning of period 8 $ 0
Other comprehensive income (loss) before reclassifications (6) 3
Reclassifications of losses into earnings 0 0
Tax benefit (provision) 0 0
Balance at end of period 2 3
Net unrealized (losses) gains on cash flow hedges    
Components of accumulated other comprehensive loss, net of taxes    
Balance at beginning of period (16) 61
Other comprehensive income (loss) before reclassifications (195) (35)
Reclassifications of losses into earnings 31 (1)
Tax benefit (provision) 30 6
Balance at end of period (150) 31
Unrealized components of defined benefit plans    
Components of accumulated other comprehensive loss, net of taxes    
Balance at beginning of period (2,342) (2,507)
Other comprehensive income (loss) before reclassifications (20) (1)
Reclassifications of losses into earnings 62 69
Tax benefit (provision) (6) (8)
Balance at end of period (2,306) (2,447)
Cumulative translation adjustment    
Components of accumulated other comprehensive loss, net of taxes    
Balance at beginning of period (627) (638)
Other comprehensive income (loss) before reclassifications (12) (8)
Reclassifications of losses into earnings 0 0
Tax benefit (provision) (1) 1
Balance at end of period (640) (645)
Accumulated other comprehensive loss    
Components of accumulated other comprehensive loss, net of taxes    
Balance at beginning of period (2,977) (3,084)
Other comprehensive income (loss) before reclassifications (233) (41)
Reclassifications of losses into earnings 93 68
Tax benefit (provision) 23 (1)
Balance at end of period $ (3,094) $ (3,058)