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Stockholders' Deficit - Schedule of Accumulated Other Comprehensive Loss, Net of Taxes (Details) - USD ($)
$ in Millions
 3 Months Ended
Jan. 31, 2019
Jan. 31, 2018
Components of accumulated other comprehensive income, net of taxes    
Balance at beginning of period $ (639)  
Other comprehensive loss before reclassifications (92)  
Reclassifications of (gain) loss into earnings (149)  
Reclassifications of settlements into earnings (1)  
Balance at end of period (1,837)  
Accumulated other comprehensive loss    
Components of accumulated other comprehensive income, net of taxes    
Balance at beginning of period (845)  
Balance at end of period (1,087)  
Net unrealized gains on available-for-sale debt securities    
Components of accumulated other comprehensive income, net of taxes    
Balance at beginning of period 5  
Other comprehensive loss before reclassifications 0 $ (2)
Reclassifications of (gain) loss into earnings 0 (5)
Reclassifications of settlements into earnings 0  
Balance at end of period 5  
Net unrealized gains (losses) on cash flow hedges    
Components of accumulated other comprehensive income, net of taxes    
Balance at beginning of period 291  
Other comprehensive loss before reclassifications (87) (481)
Reclassifications of (gain) loss into earnings (157) $ 67
Reclassifications of settlements into earnings 0  
Balance at end of period 47  
Unrealized components of defined benefit plans    
Components of accumulated other comprehensive income, net of taxes    
Balance at beginning of period (1,141)  
Other comprehensive loss before reclassifications 0  
Reclassifications of (gain) loss into earnings 8  
Reclassifications of settlements into earnings (1)  
Balance at end of period (1,134)  
Change in cumulative translation adjustment    
Components of accumulated other comprehensive income, net of taxes    
Balance at beginning of period 0  
Other comprehensive loss before reclassifications (5)  
Reclassifications of (gain) loss into earnings 0  
Reclassifications of settlements into earnings 0  
Balance at end of period $ (5)