Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jul. 31, 2018	Jul. 31, 2017	Jul. 31, 2018	Jul. 31, 2017
Statement of Comprehensive Income [Abstract]
Net earnings (loss)	$ 451	$ 165	$ 2,665	$ (180)
Change in net unrealized (losses) gains on available-for-sale securities:
Net unrealized (losses) gains arising during the period	(2)	7	(1)	(10)
Gains reclassified into earnings	0	0	(9)	0
Change in net unrealized gains (losses) on available-for-sale securities	(2)	7	(10)	(10)
Change in net unrealized gains (losses) on cash flow hedges:
Net unrealized gains (losses) arising during the period	149	(133)	50	7
Net (gains) losses reclassified into earnings	(43)	15	78	(231)
Change in net unrealized (losses) gains on cash flow hedges	106	(118)	128	(224)
Change in unrealized components of defined benefit plans:
(Losses) gains arising during the period	(25)	210	(23)	700
Amortization of actuarial loss and prior service benefit	47	56	143	230
Curtailments, settlements and other	9	6	11	9
Change in unrealized components of defined benefit plans	31	272	131	939
Change in cumulative translation adjustment	(40)	49	(40)	13
Other comprehensive income before taxes	95	210	209	718
Provision for taxes	(19)	(26)	(34)	(58)
Other comprehensive income, net of taxes	76	184	175	660
Comprehensive income	$ 527	$ 349	$ 2,840	$ 480