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Fair Value - Schedule of Assets and Liabilities on a Recurring Basis (Details) - Fair Value, Measurements, Recurring - USD ($)
$ in Millions
Jan. 31, 2020
Oct. 31, 2019
Assets    
Total assets $ 1,929 $ 2,295
Liabilities    
Total liabilities 130 147
Time deposits    
Assets    
Total assets 671 803
Money market funds    
Assets    
Total assets 607 859
Foreign bonds    
Assets    
Total assets 124 133
Other debt securities    
Assets    
Total assets 31 32
Interest rate contracts    
Assets    
Total assets 96 73
Liabilities    
Total liabilities 6 11
Foreign exchange contracts    
Assets    
Total assets 399 392
Liabilities    
Total liabilities 123 136
Other derivatives    
Assets    
Total assets 1 3
Liabilities    
Total liabilities 1 0
Level 1    
Assets    
Total assets 608 866
Liabilities    
Total liabilities 0 0
Level 1 | Time deposits    
Assets    
Total assets 0 0
Level 1 | Money market funds    
Assets    
Total assets 607 859
Level 1 | Foreign bonds    
Assets    
Total assets 1 7
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 1,290 1,397
Liabilities    
Total liabilities 130 147
Level 2 | Time deposits    
Assets    
Total assets 671 803
Level 2 | Money market funds    
Assets    
Total assets 0 0
Level 2 | Foreign bonds    
Assets    
Total assets 123 126
Level 2 | Other debt securities    
Assets    
Total assets 0 0
Level 2 | Interest rate contracts    
Assets    
Total assets 96 73
Liabilities    
Total liabilities 6 11
Level 2 | Foreign exchange contracts    
Assets    
Total assets 399 392
Liabilities    
Total liabilities 123 136
Level 2 | Other derivatives    
Assets    
Total assets 1 3
Liabilities    
Total liabilities 1 0
Level 3    
Assets    
Total assets 31 32
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 31 32
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