Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Jan. 31, 2018	Jan. 31, 2017
Statement of Comprehensive Income [Abstract]
Net earnings	$ 1,436	$ 267
Change in net unrealized gains (losses) on available-for-sale securities:
Net unrealized gains (losses) arising during the period	1	(13)
Losses reclassified into earnings	8	0
Change in net unrealized gains (losses) on available-for-sale securities	9	(13)
Change in net unrealized losses on cash flow hedges:
Net unrealized (losses) gains arising during the period	(181)	136
Net losses (gains) reclassified into earnings	30	(163)
Change in net unrealized (losses) gains on cash flow hedges	(151)	(27)
Change in unrealized components of defined benefit plans:
Gains arising during the period	2	479
Amortization of actuarial loss and prior service benefit	47	97
Change in unrealized components of defined benefit plans	49	576
Change in cumulative translation adjustment	26	(25)
Other comprehensive (loss) income before taxes	(67)	511
Benefit (provision) for taxes	7	(36)
Other comprehensive (loss) income, net of taxes	(60)	475
Comprehensive income	$ 1,376	$ 742