Fair Value - Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Millions	Jan. 31, 2019	Oct. 31, 2018
Assets
Total assets	$ 2,677	$ 3,773
Liabilities
Total liabilities	401	476
Time deposits
Assets
Total assets	521	781
Money market funds
Assets
Total assets	1,722	2,340
Foreign bonds
Assets
Total assets	131	131
Other debt securities
Assets
Total assets	24	25
Foreign exchange contracts
Assets
Total assets	274	496
Liabilities
Total liabilities	206	117
Other derivatives
Assets
Total assets	5	0
Liabilities
Total liabilities	0	6
Interest rate contracts
Liabilities
Total liabilities	195	353
Level 1
Assets
Total assets	1,729	2,347
Liabilities
Total liabilities	0	0
Level 1 | Time deposits
Assets
Total assets	0	0
Level 1 | Money market funds
Assets
Total assets	1,722	2,340
Level 1 | Foreign bonds
Assets
Total assets	7	7
Level 1 | Other debt securities
Assets
Total assets	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 1 | Interest rate contracts
Liabilities
Total liabilities	0	0
Level 2
Assets
Total assets	924	1,401
Liabilities
Total liabilities	401	476
Level 2 | Time deposits
Assets
Total assets	521	781
Level 2 | Money market funds
Assets
Total assets	0	0
Level 2 | Foreign bonds
Assets
Total assets	124	124
Level 2 | Other debt securities
Assets
Total assets	0	0
Level 2 | Foreign exchange contracts
Assets
Total assets	274	496
Liabilities
Total liabilities	206	117
Level 2 | Other derivatives
Assets
Total assets	5	0
Liabilities
Total liabilities	0	6
Level 2 | Interest rate contracts
Liabilities
Total liabilities	195	353
Level 3
Assets
Total assets	24	25
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 | Foreign bonds
Assets
Total assets	0	0
Level 3 | Other debt securities
Assets
Total assets	24	25
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
Level 3 | Interest rate contracts
Liabilities
Total liabilities	$ 0	$ 0