Stockholders' Deficit - Accumulated Other Comprehensive Loss, Net of Taxes (Details) - USD ($) $ in Millions	3 Months Ended
	Jan. 31, 2021	Jan. 31, 2020
Components of accumulated other comprehensive income, net of taxes
Balance at beginning of period	$ (2,228)
Other comprehensive income (loss) before reclassifications	(292)
Reclassifications of losses into earnings	61
Balance at end of period	(3,235)
Accumulated other comprehensive loss
Components of accumulated other comprehensive income, net of taxes
Balance at beginning of period	(1,243)
Balance at end of period	(1,473)
Net unrealized gains on available-for-sale debt securities
Components of accumulated other comprehensive income, net of taxes
Balance at beginning of period	11
Other comprehensive income (loss) before reclassifications	3	$ 1
Reclassifications of losses into earnings	0
Balance at end of period	14
Net unrealized (losses) gains on cash flow hedges
Components of accumulated other comprehensive income, net of taxes
Balance at beginning of period	(66)
Other comprehensive income (loss) before reclassifications	(319)	44
Reclassifications of losses into earnings	45	$ (49)
Balance at end of period	(340)
Unrealized components of defined benefit plans
Components of accumulated other comprehensive income, net of taxes
Balance at beginning of period	(1,190)
Other comprehensive income (loss) before reclassifications	(1)
Reclassifications of losses into earnings	16
Balance at end of period	(1,174)
Reclassifications of settlements into earnings
Components of accumulated other comprehensive income, net of taxes
Reclassifications of losses into earnings	1
Change in cumulative translation adjustment
Components of accumulated other comprehensive income, net of taxes
Balance at beginning of period	2
Other comprehensive income (loss) before reclassifications	25
Reclassifications of losses into earnings	0
Balance at end of period	$ 27