Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Oct. 31, 2020	Oct. 31, 2019	Oct. 31, 2018
Statement of Comprehensive Income [Abstract]
Net earnings	$ 2,844	$ 3,152	$ 5,327
Change in unrealized components of available-for-sale debt securities:
Unrealized gains (losses) arising during the period	2	1	(3)
Losses (gains) reclassified into earnings	0	3	(5)
Change in unrealized components of available-for-sale securities	2	4	(8)
Change in unrealized components of cash flow hedges:
Unrealized (losses) gains arising during the period	(201)
Unrealized (losses) gains arising during the period		252	341
(Gains) losses reclassified into earnings	(85)
(Gains) losses reclassified into earnings		(380)	258
Change in unrealized components of cash flow hedges	(286)
Change in unrealized components of cash flow hedges		(128)	599
Change in unrealized components of defined benefit plans:
(Losses) gains arising during the period	(29)	(303)	11
Amortization of actuarial loss and prior service benefit	83	43	48
Curtailments, settlements and other	215	42	3
Change in unrealized components of defined benefit plans	269	(218)	62
Change in cumulative translation adjustment	(4)	4	0
Other comprehensive (loss) income before taxes	(19)	(338)	653
Benefit from (provision for) taxes	1	(42)	(80)
Other comprehensive (loss) income, net of taxes	(18)	(380)	573
Comprehensive income	$ 2,826	$ 2,772	$ 5,900