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Stockholders' Equity - Components of AOCI (Details) - USD ($)
$ in Millions
 12 Months Ended
Oct. 31, 2021
Oct. 31, 2020
Oct. 31, 2019
Components of accumulated other comprehensive income, net of taxes      
Balance $ 16,096 $ 17,149 $ 21,274
Other comprehensive income (loss) before reclassifications 726 (411) (402)
Reclassifications of (gains) losses into earnings 441 234 (143)
Tax (provision) benefit (143) 8 36
Balance 20,017 16,096 17,149
Net unrealized gains (losses) on available-for-sale securities      
Components of accumulated other comprehensive income, net of taxes      
Balance 18 23 17
Other comprehensive income (loss) before reclassifications (3) (1) 9
Reclassifications of (gains) losses into earnings 0 (4) (3)
Tax (provision) benefit 0 0 0
Balance 15 18 23
Net unrealized gains (losses) on cash flow hedges      
Components of accumulated other comprehensive income, net of taxes      
Balance (7) 53 106
Other comprehensive income (loss) before reclassifications (50) (40) 308
Reclassifications of (gains) losses into earnings 156 (21) (371)
Tax (provision) benefit (18) 11 10
Balance 81 (7) 53
Unrealized components of defined benefit plans      
Components of accumulated other comprehensive income, net of taxes      
Balance (3,473) (3,366) (2,922)
Other comprehensive income (loss) before reclassifications 763 (358) (701)
Reclassifications of (gains) losses into earnings 285 259 231
Tax (provision) benefit (120) (8) 26
Balance (2,545) (3,473) (3,366)
Cumulative translation adjustment      
Components of accumulated other comprehensive income, net of taxes      
Balance (477) (437) (419)
Other comprehensive income (loss) before reclassifications 16 (12) (18)
Reclassifications of (gains) losses into earnings 0 0 0
Tax (provision) benefit (5) 5 0
Balance (466) (477) (437)
Accumulated Other Comprehensive Loss      
Components of accumulated other comprehensive income, net of taxes      
Balance (3,939) (3,727) (3,218)
Balance (2,915) (3,939) (3,727)
Effect of change in accounting principle      
Components of accumulated other comprehensive income, net of taxes      
Balance $ (25) [1]   (2,181) [2]
Balance [1]   (25)  
Effect of change in accounting principle | Net unrealized gains (losses) on cash flow hedges      
Components of accumulated other comprehensive income, net of taxes      
Balance   (10)  
Balance     (10)
Effect of change in accounting principle | Cumulative translation adjustment      
Components of accumulated other comprehensive income, net of taxes      
Balance   (33)  
Balance     (33)
Effect of change in accounting principle | Accumulated Other Comprehensive Loss      
Components of accumulated other comprehensive income, net of taxes      
Balance [3]   $ (43)  
Balance [3]     $ (43)
[1] For fiscal 2021, $25 million represents the impact of the adoption of the accounting standard on the measurement of credit losses on financing receivables.
[2] For fiscal 2019, includes $2.3 billion related to an addition to accumulated deficit as a result of the adoption of an accounting standard update for Income Taxes and $124 million related to a reduction to accumulated deficit as a result of the adoption of the new revenue accounting standard.
[3] For fiscal 2020, $43 million represents the impact of the adoption of an accounting standard update that allows for the reclassification of stranded tax effects from accumulated other comprehensive loss to accumulated deficit.