Borrowings -Term Debt (Details) - USD ($)	3 Months Ended		9 Months Ended
	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2016	Jul. 31, 2015	Oct. 31, 2015
Long-term debt
Total	$ 15,354,000,000		$ 15,354,000,000		$ 15,103,000,000
Fair value adjustment related to hedged debt	239,000,000		239,000,000		(55,000,000)
Less: current portion	(131,000,000)		(131,000,000)		(161,000,000)
Interest expense on borrowings recognized in Condensed Consolidated and Combined Statements of Earnings
Financing interest	65,000,000	$ 58,000,000	183,000,000	$ 182,000,000
Interest expense	79,000,000	7,000,000	248,000,000	27,000,000
Total interest expense	144,000,000	$ 65,000,000	431,000,000	$ 209,000,000
$2,250 issued at discount to par at a price of 99.944% in October 2015 at 2.45%, due October 5, 2017, interest payable semi-annually on April 5 and October 5 of each year
Long-term debt
Total	$ 2,249,000,000		$ 2,249,000,000		2,249,000,000
Discount to par (as a percent)	99.944%		99.944%
Interest rate (as a percent)	2.45%		2.45%
Face amount of debt instrument	$ 2,250,000,000		$ 2,250,000,000
$2,650 issued at discount to par at a price of 99.872% in October 2015 at 2.85%, due October 5, 2018, interest payable semi-annually on April 5 and October 5 of each year
Long-term debt
Total	$ 2,648,000,000		$ 2,648,000,000		2,647,000,000
Discount to par (as a percent)	99.872%		99.872%
Interest rate (as a percent)	2.85%		2.85%
Face amount of debt instrument	$ 2,650,000,000		$ 2,650,000,000
$3,000 issued at discount to par at a price of 99.972% in October 2015 at 3.6%, due October 15, 2020, interest payable semi-annually on April 15 and October 15 of each year
Long-term debt
Total	$ 2,999,000,000		$ 2,999,000,000		2,999,000,000
Discount to par (as a percent)	99.972%		99.972%
Interest rate (as a percent)	3.60%		3.60%
Face amount of debt instrument	$ 3,000,000,000		$ 3,000,000,000
$1,350 issued at discount to par at a price of 99.802% in October 2015 at 4.4%, due October 15, 2022, interest payable semi-annually on April 15 and October 15 of each year
Long-term debt
Total	$ 1,348,000,000		$ 1,348,000,000		1,347,000,000
Discount to par (as a percent)	99.802%		99.802%
Interest rate (as a percent)	4.40%		4.40%
Face amount of debt instrument	$ 1,350,000,000		$ 1,350,000,000
$2,500 issued at discount to par at a price of 99.725% in October 2015 at 4.9%, due October 15, 2025, interest payable semi-annually on April 15 and October 15 of each year
Long-term debt
Total	$ 2,494,000,000		$ 2,494,000,000		2,493,000,000
Discount to par (as a percent)	99.725%		99.725%
Interest rate (as a percent)	4.90%		4.90%
Face amount of debt instrument	$ 2,500,000,000		$ 2,500,000,000
$750 issued at discount to par at a price of 99.942% in October 2015 at 6.2%, due October 15, 2035, interest payable semi-annually on April 15 and October 15 of each year
Long-term debt
Total	$ 750,000,000		$ 750,000,000		749,000,000
Discount to par (as a percent)	99.942%		99.942%
Interest rate (as a percent)	6.20%		6.20%
Face amount of debt instrument	$ 750,000,000		$ 750,000,000
$1,500 issued at discount to par at a price of 99.932% in October 2015 at 6.35%, due October 15, 2045, interest payable semi-annually on April 15 and October 15 of each year
Long-term debt
Total	$ 1,499,000,000		$ 1,499,000,000		1,499,000,000
Discount to par (as a percent)	99.932%		99.932%
Interest rate (as a percent)	6.35%		6.35%
Face amount of debt instrument	$ 1,500,000,000		$ 1,500,000,000
$350 issued at par in October 2015 at three-month USD LIBOR plus 1.74%, due October 5, 2017, interest payable quarterly on January 5, April 5, July 5 and October 5 of each year | LIBOR
Long-term debt
Total	$ 350,000,000		$ 350,000,000		350,000,000
Interest rate (as a percent)	1.74%		1.74%
Face amount of debt instrument	$ 350,000,000		$ 350,000,000
$250 issued at par in October 2015 at three-month USD LIBOR plus 1.93%, due October 5, 2018, interest payable quarterly on January 5, April 5, July 5 and October 5 of each year | LIBOR
Long-term debt
Total	$ 250,000,000		$ 250,000,000		250,000,000
Interest rate (as a percent)	1.93%		1.93%
Face amount of debt instrument	$ 250,000,000		$ 250,000,000
$300 issued October 1999 at 7.45%, due October 2029
Long-term debt
Total	$ 312,000,000		$ 312,000,000		313,000,000
Interest rate (as a percent)	7.45%		7.45%
Face amount of debt instrument	$ 300,000,000		$ 300,000,000
Other, including capital lease obligations, at 0.00%-8.47%, due in calendar years 2016-2022
Long-term debt
Other, including capital lease obligations	$ 347,000,000		347,000,000		423,000,000
Minimum interest rate (as a percent)	0.00%
Maximum interest rate (as a percent)	7.40%
Other, including capital lease obligations, at 0.00%-8.47%, due in calendar years 2016-2022 | Financial Services
Long-term debt
Other, including capital lease obligations	$ 190,000,000		190,000,000		$ 196,000,000
MphasiS
Long-term debt
Total	$ 21,000,000		$ 21,000,000