Quarterly Summary (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Oct. 31, 2019	Jul. 31, 2019	Apr. 30, 2019	Jan. 31, 2019	Oct. 31, 2018	Jul. 31, 2018	Apr. 30, 2018	Jan. 31, 2018	Oct. 31, 2019	Oct. 31, 2018	Oct. 31, 2017
Quarterly Financial Information Disclosure [Abstract]
Net revenue	$ 7,215	$ 7,217	$ 7,150	$ 7,553	$ 7,946	$ 7,764	$ 7,468	$ 7,674	$ 29,135	$ 30,852	$ 28,871
Cost of sales	4,822	4,768	4,845	5,207	5,507	5,399	5,210	5,505
Segment earnings (loss) from operations	460	(76)	434	456	653	490	366	228	1,274	1,737	564
Net earnings (loss)	$ 480	$ (27)	$ 419	$ 177	$ (772)	$ 452	$ 850	$ 1,482	$ 1,049	$ 2,012	$ 436
Total basic net earnings per share (in dollars per share)	$ 0.37	$ (0.02)	$ 0.31	$ 0.13					$ 0.78	$ 1.25	$ 0.21
Total diluted net earnings per share (in dollars per share)	$ 0.36	$ (0.02)	$ 0.30	$ 0.13					0.77	1.23	0.21
Continuing operations - basic (in dollars per share)					$ (0.53)	$ 0.30	$ 0.55	$ 0.93	0.78	1.32	0.26
Continuing operations - diluted (in dollars per share)					$ (0.53)	$ 0.29	$ 0.54	$ 0.92	$ 0.77	$ 1.30	$ 0.26