Borrowings - Schedule of Long-Term Debt (Details) - USD ($)	Apr. 30, 2020	Oct. 31, 2019
Long-term debt
Fair value adjustment related to hedged debt	$ 14,000,000	$ 4,000,000
Unamortized debt issuance cost	(14,000,000)	(16,000,000)
Current portion of long-term debt	(881,000,000)	(307,000,000)
Total long-term debt	3,941,000,000	4,780,000,000
U.S. Dollar Global Notes
Long-term debt
Long-term debt	4,247,000,000	4,246,000,000
2009 Shelf Registration Statement- $1,350 issued at discount to par at a price of 99.827% in December 2010 at 3.75%, due December 2020
Long-term debt
Long-term debt	649,000,000	648,000,000
Face amount of debt instrument	$ 1,350,000,000
Discount to par (percent)	99.827%
Interest rate (percent)	3.75%
2009 Shelf Registration Statement- $1,250 issued at discount to par at a price of 99.799% in May 2011 at 4.3%, due June 2021
Long-term debt
Long-term debt	$ 667,000,000	667,000,000
Face amount of debt instrument	$ 1,250,000,000
Discount to par (percent)	99.799%
Interest rate (percent)	4.30%
2009 Shelf Registration Statement- $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	$ 538,000,000	538,000,000
Face amount of debt instrument	$ 1,000,000,000
Discount to par (percent)	99.816%
Interest rate (percent)	4.375%
2009 Shelf Registration Statement- $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	$ 695,000,000	695,000,000
Face amount of debt instrument	$ 1,500,000,000
Discount to par (percent)	99.707%
Interest rate (percent)	4.65%
2009 Shelf Registration Statement- $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%
2009 Shelf Registration Statement- $1,200 issued at discount to par at a price of 99.863% in September 2011 at 6.0%, 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%
Other borrowings at 0.51%-9.00%, due in calendar years 2020-2027
Long-term debt
Other borrowings at 0.51%-9.00%, due in calendar years 2020-2027	$ 575,000,000	$ 853,000,000
Other borrowings at 0.51%-9.00%, due in calendar years 2020-2027 \| Minimum
Long-term debt
Interest rate (percent)	0.51%
Other borrowings at 0.51%-9.00%, due in calendar years 2020-2027 \| Maximum
Long-term debt
Interest rate (percent)	9.00%

The discount to par at which a debt instrument was issued.

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Amount as of the balance sheet date of the unamortized adjustment to the carrying value of an interest-bearing hedged item made under an effective interest rate fair value hedge that is amortized upon discontinuation of the interest rate fair value hedge.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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