Fair Value (Details) - USD ($) $ in Millions	Oct. 31, 2020	Oct. 31, 2019
Assets:
Fair Value	$ 3,932	$ 3,705
Derivative Instruments	195	392
Liabilities:
Derivative Instruments	262	166
Fair value, short- and long-term debt	6,700	5,400
Carrying value, short- and long-term debt	6,200	5,100
Fair value measured on a recurring basis
Assets:
Total Assets	4,459	4,153
Liabilities:
Total Liabilities	262	166
Fair value measured on a recurring basis | Corporate debt
Assets:
Fair Value	1,700	1,283
Available-for-Sale Investments	169	0
Fair value measured on a recurring basis | Financial institution instruments
Assets:
Fair Value	59	0
Available-for-Sale Investments	32	0
Fair value measured on a recurring basis | Government debt
Assets:
Fair Value	2,173	2,422
Available-for-Sale Investments	73	0
Fair value measured on a recurring basis | Marketable equity securities and Mutual funds
Assets:
Equity securities, Fair Value	58	56
Fair value measured on a recurring basis | Interest rate contracts
Assets:
Derivative Instruments	4	4
Liabilities:
Derivative Instruments	3	0
Fair value measured on a recurring basis | Foreign currency contracts
Assets:
Derivative Instruments	191	381
Liabilities:
Derivative Instruments	256	165
Fair value measured on a recurring basis | Other derivatives
Assets:
Derivative Instruments	0	7
Liabilities:
Derivative Instruments	3	1
Fair value measured on a recurring basis | Level 1
Assets:
Total Assets	1,997	2,428
Liabilities:
Total Liabilities	0	0
Fair value measured on a recurring basis | Level 1 | Corporate debt
Assets:
Fair Value	0	0
Available-for-Sale Investments	0	0
Fair value measured on a recurring basis | Level 1 | Financial institution instruments
Assets:
Fair Value	0	0
Available-for-Sale Investments	0	0
Fair value measured on a recurring basis | Level 1 | Government debt
Assets:
Fair Value	1,992	2,422
Available-for-Sale Investments	0	0
Fair value measured on a recurring basis | Level 1 | Marketable equity securities and Mutual funds
Assets:
Equity securities, Fair Value	5	6
Fair value measured on a recurring basis | Level 1 | Interest rate contracts
Assets:
Derivative Instruments	0	0
Liabilities:
Derivative Instruments	0	0
Fair value measured on a recurring basis | Level 1 | Foreign currency contracts
Assets:
Derivative Instruments	0	0
Liabilities:
Derivative Instruments	0	0
Fair value measured on a recurring basis | Level 1 | Other derivatives
Assets:
Derivative Instruments	0	0
Liabilities:
Derivative Instruments	0	0
Fair value measured on a recurring basis | Level 2
Assets:
Total Assets	2,462	1,725
Liabilities:
Total Liabilities	262	166
Fair value measured on a recurring basis | Level 2 | Corporate debt
Assets:
Fair Value	1,700	1,283
Available-for-Sale Investments	169	0
Fair value measured on a recurring basis | Level 2 | Financial institution instruments
Assets:
Fair Value	59	0
Available-for-Sale Investments	32	0
Fair value measured on a recurring basis | Level 2 | Government debt
Assets:
Fair Value	181	0
Available-for-Sale Investments	73	0
Fair value measured on a recurring basis | Level 2 | Marketable equity securities and Mutual funds
Assets:
Equity securities, Fair Value	53	50
Fair value measured on a recurring basis | Level 2 | Interest rate contracts
Assets:
Derivative Instruments	4	4
Liabilities:
Derivative Instruments	3	0
Fair value measured on a recurring basis | Level 2 | Foreign currency contracts
Assets:
Derivative Instruments	191	381
Liabilities:
Derivative Instruments	256	165
Fair value measured on a recurring basis | Level 2 | Other derivatives
Assets:
Derivative Instruments	0	7
Liabilities:
Derivative Instruments	3	1
Fair value measured on a recurring basis | Level 3
Assets:
Total Assets	0	0
Liabilities:
Total Liabilities	0	0
Fair value measured on a recurring basis | Level 3 | Corporate debt
Assets:
Fair Value	0	0
Available-for-Sale Investments	0	0
Fair value measured on a recurring basis | Level 3 | Financial institution instruments
Assets:
Fair Value	0	0
Available-for-Sale Investments	0	0
Fair value measured on a recurring basis | Level 3 | Government debt
Assets:
Fair Value	0	0
Available-for-Sale Investments	0	0
Fair value measured on a recurring basis | Level 3 | Marketable equity securities and Mutual funds
Assets:
Equity securities, Fair Value	0	0
Fair value measured on a recurring basis | Level 3 | Interest rate contracts
Assets:
Derivative Instruments	0	0
Liabilities:
Derivative Instruments	0	0
Fair value measured on a recurring basis | Level 3 | Foreign currency contracts
Assets:
Derivative Instruments	0	0
Liabilities:
Derivative Instruments	0	0
Fair value measured on a recurring basis | Level 3 | Other derivatives
Assets:
Derivative Instruments	0	0
Liabilities:
Derivative Instruments	$ 0	$ 0