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Stockholders' Equity - Components of AOCI (Details) - USD ($)
$ in Millions
 3 Months Ended
Jan. 31, 2020
Jan. 31, 2019
Components of accumulated other comprehensive loss, net of taxes    
Balance at beginning of period $ 17,149  
Balance at end of period 17,243  
Net unrealized gains (losses) on available-for-sale securities    
Components of accumulated other comprehensive loss, net of taxes    
Balance at beginning of period 23  
Effect of change in accounting principle 0  
Other comprehensive income (loss) before reclassifications 2 $ 2
Reclassifications of (gains) losses into earnings (3) (3)
Balance at end of period 22  
Net unrealized gains (losses) on cash flow hedges    
Components of accumulated other comprehensive loss, net of taxes    
Balance at beginning of period 53  
Effect of change in accounting principle (10)  
Other comprehensive income (loss) before reclassifications 65 33
Reclassifications of (gains) losses into earnings (60) (117)
Balance at end of period 48  
Unrealized components of defined benefit plans    
Components of accumulated other comprehensive loss, net of taxes    
Balance at beginning of period (3,366)  
Effect of change in accounting principle 0  
Other comprehensive income (loss) before reclassifications 17  
Reclassifications of (gains) losses into earnings 52  
Balance at end of period (3,297)  
Cumulative translation adjustment    
Components of accumulated other comprehensive loss, net of taxes    
Balance at beginning of period (437)  
Effect of change in accounting principle (33)  
Other comprehensive income (loss) before reclassifications (3)  
Reclassifications of (gains) losses into earnings 0  
Balance at end of period (473)  
Accumulated other comprehensive loss    
Components of accumulated other comprehensive loss, net of taxes    
Balance at beginning of period (3,727) (3,218)
Effect of change in accounting principle [1] (43)  
Other comprehensive income (loss) before reclassifications 81  
Reclassifications of (gains) losses into earnings (11)  
Balance at end of period $ (3,700) $ (3,294)
[1] 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.