Stockholders' Deficit - Schedule of Accumulated Other Comprehensive Loss, Net of Taxes (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Apr. 30, 2017	Apr. 30, 2016	Apr. 30, 2017	Apr. 30, 2016
Components of accumulated other comprehensive income, net of taxes
Balance at beginning of period			$ (3,889)
Other comprehensive income (loss) before reclassifications			(226)
Reclassifications of (income) loss into earnings			(50)
Balance at end of period	$ (3,955)		(3,955)
Accumulated other comprehensive loss
Components of accumulated other comprehensive income, net of taxes
Balance at beginning of period			(1,438)
Balance at end of period	(1,714)		(1,714)
Net unrealized gains on available-for-sale securities
Components of accumulated other comprehensive income, net of taxes
Balance at beginning of period			9
Other comprehensive income (loss) before reclassifications	1	$ 1	3	$ 1
Reclassifications of (income) loss into earnings			0
Balance at end of period	12		12
Net unrealized gains (losses) on cash flow hedges
Components of accumulated other comprehensive income, net of taxes
Balance at beginning of period			186
Other comprehensive income (loss) before reclassifications	(60)	(105)	(232)	11
Reclassifications of (income) loss into earnings	(9)	$ (47)	(76)	$ (73)
Balance at end of period	(122)		(122)
Unrealized components of defined benefit plans
Components of accumulated other comprehensive income, net of taxes
Balance at beginning of period			(1,633)
Other comprehensive income (loss) before reclassifications			3
Reclassifications of (income) loss into earnings			26
Balance at end of period	$ (1,604)		$ (1,604)