Retirement and Post-Retirement Benefit Plans - Schedule of Pension and Post-Retirement Benefit (Credit) Cost (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Apr. 30, 2022	Apr. 30, 2021	Apr. 30, 2022	Apr. 30, 2021
Post-Retirement Benefit Plans
Retirement and post-retirement benefit plans
Service cost	$ 0	$ 1	$ 0	$ 1
Interest cost	2	2	4	4
Expected return on plan assets	(2)	(6)	(4)	(12)
Amortization and deferrals:
Actuarial loss (gain)	(4)	(4)	(8)	(8)
Prior service cost (credit)	(3)	(3)	(6)	(6)
Net periodic benefit (credit) cost			(14)	(21)
Settlement loss			0	0
Total periodic benefit (credit) cost	(7)	(10)	(14)	(21)
U.S. | Defined Benefit Plans
Retirement and post-retirement benefit plans
Service cost	0	0	0	0
Interest cost	40	76	80	152
Expected return on plan assets	(75)	(127)	(149)	(254)
Amortization and deferrals:
Actuarial loss (gain)	2	15	3	30
Prior service cost (credit)	0	0	0	0
Net periodic benefit (credit) cost			(66)	(72)
Settlement loss			0	1
Total periodic benefit (credit) cost	(33)	(36)	(66)	(71)
Non-U.S. | Defined Benefit Plans
Retirement and post-retirement benefit plans
Service cost	14	17	28	34
Interest cost	5	4	11	9
Expected return on plan assets	(12)	(12)	(25)	(24)
Amortization and deferrals:
Actuarial loss (gain)	9	14	19	27
Prior service cost (credit)	1	(1)	3	(1)
Net periodic benefit (credit) cost			36	45
Settlement loss			0	0
Total periodic benefit (credit) cost	$ 17	$ 22	$ 36	$ 45