Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Oct. 31, 2019	Oct. 31, 2018	Oct. 31, 2017
Statement of Comprehensive Income [Abstract]
Net earnings	$ 1,049	$ 1,908	$ 344
Change in net unrealized gains (losses) on available-for-sale securities:
Net unrealized gains (losses) arising during the period	9	(3)	(8)
Gains reclassified into earnings	(3)	(9)	(4)
Change in unrealized gains (losses) on available-for-sale securities	6	(12)	(12)
Change in net unrealized (losses) gains on cash flow hedges:
Net unrealized gains arising during the period	308	169	46
Net (gains) losses reclassified into earnings	(371)	8	(145)
Change in unrealized (losses) gains on cash flow hedges	(63)	177	(99)
Change in unrealized components of defined benefit plans:
Net unrealized (losses) gains arising during the period	(701)	(423)	944
Amortization of net actuarial loss and prior service benefit	216	191	285
Curtailments, settlements and other	15	22	15
Change in unrealized components of defined benefit plans	(470)	(210)	1,244
Cumulative translation adjustment arising during the period	(18)	(70)	(14)
Release of cumulative translation adjustment as a result of divestitures and country exits	0	20	0
Change in cumulative translation adjustment	(18)	(50)	(14)
Other comprehensive (loss) income before taxes	(545)	(95)	1,119
Benefit (provision) for taxes	36	(42)	(145)
Other comprehensive (loss) income, net of taxes	(509)	(137)	974
Comprehensive income	$ 540	$ 1,771	$ 1,318