Stockholders' Deficit - Schedule of Changes and Reclassifications Related to Other Comprehensive Income, Net of Taxes (Details) - USD ($) $ in Millions	3 Months Ended
	Jan. 31, 2017	Jan. 31, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Unrealized gains arising during the period	$ (178)
Reclassifications of (gains) losses into earnings	(53)
Other comprehensive (loss) income, net of taxes	(231)	$ 99
Change in unrealized gains (losses) on available-for-sale securities
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Unrealized gains arising during the period	2	0
Reclassifications of (gains) losses into earnings	0
Change in unrealized components of cash flow hedges
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Unrealized gains arising during the period	(172)	116
Reclassifications of (gains) losses into earnings	(67)	(26)
Other comprehensive (loss) income, net of taxes	(239)	90
Tax provision on amortization of actuarial loss and prior service benefit
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassifications of (gains) losses into earnings	14	9
Settlements and other
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassifications of (gains) losses into earnings	(8)	0
Change in unrealized components of defined benefit plans
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Unrealized gains arising during the period	(8)
Reclassifications of (gains) losses into earnings	14
Other comprehensive (loss) income, net of taxes	$ 6	$ 9