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Borrowings - Schedule of Long-Term Debt (Details) - USD ($)	1 Months Ended
	Jan. 31, 2014	Oct. 31, 2018	Oct. 31, 2017	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	May 31, 2011	Dec. 31, 2010
Debt Instrument [Line Items]
Fair value adjustment related to hedged debt		$ (28,000,000)	$ 8,000,000
Less: Unamortized debt issuance discounts and cost		(17,000,000)	(19,000,000)
Current portion of long-term debt		(565,000,000)	(96,000,000)
Total long-term debt		4,524,000,000	6,747,000,000
U.S. Dollar Global Notes
Debt Instrument [Line Items]
Long-term Debt		4,647,000,000	6,494,000,000
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
Debt Instrument [Line Items]
Long-term Debt		648,000,000	648,000,000
Discount to par (percent)								99.827%
Interest rate (percent)								3.75%
Face amount of debt instrument								$ 1,350,000,000
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
Debt Instrument [Line Items]
Long-term Debt		$ 667,000,000	1,249,000,000
Discount to par (percent)							99.799%
Interest rate (percent)		4.30%					4.30%
Face amount of debt instrument							$ 1,250,000,000
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
Debt Instrument [Line Items]
Long-term Debt		$ 538,000,000	999,000,000
Discount to par (percent)						99.816%
Interest rate (percent)		4.375%				4.375%
Face amount of debt instrument						$ 1,000,000,000
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
Debt Instrument [Line Items]
Long-term Debt		$ 694,000,000	1,498,000,000
Discount to par (percent)					99.707%
Interest rate (percent)		4.65%			4.65%
Face amount of debt instrument					$ 1,500,000,000
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
Debt Instrument [Line Items]
Long-term Debt		$ 499,000,000	499,000,000
Discount to par (percent)				99.771%
Interest rate (percent)				4.05%
Face amount of debt instrument				$ 500,000,000
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
Debt Instrument [Line Items]
Long-term Debt		1,199,000,000	1,199,000,000
Discount to par (percent)						99.863%
Interest rate (percent)						6.00%
Face amount of debt instrument						$ 1,200,000,000
2012 Shelf Registration Statement-$750 issued at par in January 2014 at three-month USD LIBOR plus 0.94%, due January 2019
Debt Instrument [Line Items]
Long-term Debt		102,000,000	102,000,000
Face amount of debt instrument	$ 750,000,000
Spread on interest rate (percent)	0.94%
2012 Shelf Registration Statement-$1,250 issued at discount to par at a price of 99.954% in January 2014 at 2.75%, due January 2019
Debt Instrument [Line Items]
Long-term Debt		300,000,000	300,000,000
Discount to par (percent)	99.954%
Interest rate (percent)	2.75%
Face amount of debt instrument	$ 1,250,000,000
Other, including capital lease obligations, at 0.51%- 8.48%, due in calendar years 2019-2025
Debt Instrument [Line Items]
Other, including capital lease obligations, at 0.51%- 8.48%, due in calendar years 2019-2025		$ 487,000,000	$ 360,000,000
Other, including capital lease obligations, at 0.51%- 8.48%, due in calendar years 2019-2025 | Minimum
Debt Instrument [Line Items]
Interest rate (percent)		0.51%
Other, including capital lease obligations, at 0.51%- 8.48%, due in calendar years 2019-2025 | Maximum
Debt Instrument [Line Items]
Interest rate (percent)		8.48%

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- Definition

The total of the amount of other borrowings and capital lease obligations. Capital lease obligations represents the amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executor costs such as insurance, maintenance, and taxes to be paid by the lesser, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date.

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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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