Fair Value - Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Millions	Jul. 31, 2017	Oct. 31, 2016
Assets
Total assets	$ 5,309	$ 11,474
Liabilities
Total liabilities	709	219
Time deposits
Assets
Total assets	1,433	4,035
Money market funds
Assets
Total assets	3,357	6,495
Equity securities in public companies
Assets
Total assets	14	16
Foreign bonds
Assets
Total assets	241	180
Other debt securities
Assets
Total assets	26	28
Interest rate contracts
Assets
Total assets	0	109
Liabilities
Total liabilities	99	6
Foreign exchange contracts
Assets
Total assets	235	611
Liabilities
Total liabilities	610	211
Other derivatives
Assets
Total assets	3	0
Liabilities
Total liabilities	0	2
Level 1
Assets
Total assets	3,380	6,511
Liabilities
Total liabilities	0	0
Level 1 | Time deposits
Assets
Total assets	0	0
Level 1 | Money market funds
Assets
Total assets	3,357	6,495
Level 1 | Equity securities in public companies
Assets
Total assets	14	16
Level 1 | Foreign bonds
Assets
Total assets	9	0
Level 1 | Other debt securities
Assets
Total assets	0	0
Level 1 | Interest rate contracts
Assets
Total assets	0	0
Liabilities
Total liabilities	0	0
Level 1 | Foreign exchange contracts
Assets
Total assets	0	0
Liabilities
Total liabilities	0	0
Level 1 | Other derivatives
Assets
Total assets	0	0
Liabilities
Total liabilities	0	0
Level 2
Assets
Total assets	1,903	4,935
Liabilities
Total liabilities	709	219
Level 2 | Time deposits
Assets
Total assets	1,433	4,035
Level 2 | Money market funds
Assets
Total assets	0	0
Level 2 | Equity securities in public companies
Assets
Total assets	0	0
Level 2 | Foreign bonds
Assets
Total assets	232	180
Level 2 | Other debt securities
Assets
Total assets	0	0
Level 2 | Interest rate contracts
Assets
Total assets	0	109
Liabilities
Total liabilities	99	6
Level 2 | Foreign exchange contracts
Assets
Total assets	235	611
Liabilities
Total liabilities	610	211
Level 2 | Other derivatives
Assets
Total assets	3	0
Liabilities
Total liabilities	0	2
Level 3
Assets
Total assets	26	28
Liabilities
Total liabilities	0	0
Level 3 | Time deposits
Assets
Total assets	0	0
Level 3 | Money market funds
Assets
Total assets	0	0
Level 3 | Equity securities in public companies
Assets
Total assets	0	0
Level 3 | Foreign bonds
Assets
Total assets	0	0
Level 3 | Other debt securities
Assets
Total assets	26	28
Level 3 | Interest rate contracts
Assets
Total assets	0	0
Liabilities
Total liabilities	0	0
Level 3 | Foreign exchange contracts
Assets
Total assets	0	0
Liabilities
Total liabilities	0	0
Level 3 | Other derivatives
Assets
Total assets	0	0
Liabilities
Total liabilities	$ 0	$ 0