Borrowings - Schedule of Long-Term Debt (Details) - USD ($)	Apr. 30, 2021	Oct. 31, 2020
Long-term debt
Fair value adjustment related to hedged debt	$ (6,000,000)	$ 2,000,000
Unamortized debt issuance cost	(37,000,000)	(37,000,000)
Current portion of long-term debt	(1,191,000,000)	(633,000,000)
Total long-term debt	4,917,000,000	5,543,000,000
U.S. Dollar Global Notes
Long-term debt
Long-term debt	5,689,000,000	5,689,000,000
$1,000 issued at discount to par at a price of 99.816% in September 2011 at 4.375%, due September 2021
Long-term debt
Long-term debt	412,000,000	412,000,000
Face amount of debt instrument	$ 1,000,000,000
Discount to par (percent)	99.816%
Interest rate (percent)	4.375%
$1,500 issued at discount to par at a price of 99.707% in December 2011 at 4.65%, due December 2021
Long-term debt
Long-term debt	$ 586,000,000	586,000,000
Face amount of debt instrument	$ 1,500,000,000
Discount to par (percent)	99.707%
Interest rate (percent)	4.65%
$500 issued at discount to par at a price of 99.771% in March 2012 at 4.05%, due September 2022
Long-term debt
Long-term debt	$ 499,000,000	499,000,000
Face amount of debt instrument	$ 500,000,000
Discount to par (percent)	99.771%
Interest rate (percent)	4.05%
$1,200 issued at discount to par at a price of 99.863% in September 2011 at 6.00%, due September 2041
Long-term debt
Long-term debt	$ 1,199,000,000	1,199,000,000
Face amount of debt instrument	$ 1,200,000,000
Discount to par (percent)	99.863%
Interest rate (percent)	6.00%
$1,150 issued at discount to par at a price of 99.769% in June 2020 at 2.2%, due June 2025
Long-term debt
Long-term debt	$ 1,148,000,000	1,148,000,000
Face amount of debt instrument	$ 1,150,000,000
Discount to par (percent)	99.769%
Interest rate (percent)	2.20%
$1,000 issued at discount to par at a price of 99.718% in June 2020 at 3.0%, due June 2027
Long-term debt
Long-term debt	$ 997,000,000	997,000,000
Face amount of debt instrument	$ 1,000,000,000
Discount to par (percent)	99.718%
Interest rate (percent)	3.00%
$850 issued at discount to par at a price of 99.790% in June 2020 at 3.4%, due June 2030
Long-term debt
Long-term debt	$ 848,000,000	848,000,000
Face amount of debt instrument	$ 850,000,000
Discount to par (percent)	99.79%
Interest rate (percent)	3.40%
Other borrowings at 0.51%-9.00%, due in calendar years 2021-2028
Long-term debt
Other borrowings at 0.51%-9.00%, due in calendar years 2021-2028	$ 462,000,000	$ 522,000,000
Other borrowings at 0.51%-9.00%, due in calendar years 2021-2028 \| Minimum
Long-term debt
Interest rate (percent)	0.51%
Other borrowings at 0.51%-9.00%, due in calendar years 2021-2028 \| Maximum
Long-term debt
Interest rate (percent)	9.00%

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