Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Apr. 30, 2018	Apr. 30, 2017	Apr. 30, 2018	Apr. 30, 2017
Statement of Comprehensive Income [Abstract]
Net earnings (loss)	$ 778	$ (612)	$ 2,214	$ (345)
Change in net unrealized losses on available-for-sale securities:
Net unrealized (losses) gains arising during the period	0	(4)	1	(17)
Gains reclassified into earnings	(17)	0	(9)	0
Change in net unrealized gains (losses) on available-for-sale securities	(17)	(4)	(8)	(17)
Change in net unrealized gains (losses) on cash flow hedges:
Net unrealized gains (losses) arising during the period	82	4	(99)	140
Net losses (gains) reclassified into earnings	91	(83)	121	(246)
Change in net unrealized (losses) gains on cash flow hedges	173	(79)	22	(106)
Change in unrealized components of defined benefit plans:
Gains arising during the period	0	11	2	490
Amortization of actuarial loss and prior service benefit	49	77	96	174
Curtailments, settlements and other	2	3	2	3
Change in unrealized components of defined benefit plans	51	91	100	667
Change in cumulative translation adjustment	(26)	(11)	0	(36)
Other comprehensive income (loss) before taxes	181	(3)	114	508
(Provision) benefit for taxes	(22)	4	(15)	(32)
Other comprehensive income, net of taxes	159	1	99	476
Comprehensive income (loss)	$ 937	$ (611)	$ 2,313	$ 131