Goodwill, Customer Relationships and Other Intangible Assets - Cost of Equity (Details)	Oct. 31, 2022	Oct. 31, 2020
Mass Markets
Finite-Lived Intangible Assets [Line Items]
Weighted average cost of capital	9.40%
After-tax cost of debt	4.70%
Cost of equity	14.00%
NA Business
Finite-Lived Intangible Assets [Line Items]
Weighted average cost of capital	9.40%
After-tax cost of debt	4.70%
Cost of equity	14.00%
EMEA
Finite-Lived Intangible Assets [Line Items]
Weighted average cost of capital	9.80%	8.00%
After-tax cost of debt	5.10%	2.90%
Cost of equity	14.40%	11.20%
APAC
Finite-Lived Intangible Assets [Line Items]
Weighted average cost of capital	11.30%	10.10%
After-tax cost of debt	6.30%	3.90%
Cost of equity	16.20%	14.00%
Consumer, Enterprise, Wholesale, Small and medium business, and NA GAM
Finite-Lived Intangible Assets [Line Items]
Weighted average cost of capital		7.60%
After-tax cost of debt		2.50%
Cost of equity		10.70%
LATAM
Finite-Lived Intangible Assets [Line Items]
Weighted average cost of capital		14.30%
After-tax cost of debt		6.90%
Cost of equity		18.80%