Borrowings (Details 2) - USD ($) $ in Millions	1 Months Ended	3 Months Ended		6 Months Ended	9 Months Ended		12 Months Ended
	Jan. 31, 2014	Jul. 31, 2015	Jul. 31, 2014	Apr. 30, 2015	Jul. 31, 2015	Jul. 31, 2014	Oct. 31, 2014	Jan. 31, 2015	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	May. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Mar. 31, 2008	Feb. 28, 2007	Oct. 31, 1999
Long-term debt
Total		$ 14,468			$ 14,468		$ 16,039
Fair value adjustment related to hedged debt		138			138		120
Less: current portion		(2,935)			(2,935)		(2,655)
Interest expense on borrowings recognized in Consolidated Condensed Statements of Earnings
Financing interest		58	$ 70		182	$ 211
Interest expense		82	80		224	270
Total interest expense		140	$ 150		406	$ 481
U.S. Dollar Global Notes
Long-term debt
Total		16,439			16,439		17,837
2006 Shelf Registration Statement-$500 issued at discount to par at a price of 99.694% in February 2007 at 5.4%, due March 2017
Long-term debt
Total		500			500		$ 500
Discount to par (as a percent)				99.694%			99.694%									99.694%
Interest rate (as a percent)				5.40%			5.40%									5.40%
Face amount of debt instrument				$ 500			$ 500									$ 500
2006 Shelf Registration Statement-$750 issued at discount to par at a price of 99.932% in March 2008 at 5.5%, due March 2018
Long-term debt
Total		750			750		$ 750
Discount to par (as a percent)				99.932%			99.932%								99.932%
Interest rate (as a percent)				5.50%			5.50%								5.50%
Face amount of debt instrument				$ 750			$ 750								$ 750
2009 Shelf Registration Statement-$1,100 issued at discount to par at a price of 99.887% in September 2010 at 2.125%, due September 2015
Long-term debt
Total		1,100			1,100		$ 1,100
Discount to par (as a percent)				99.887%			99.887%							99.887%
Interest rate (as a percent)				2.125%			2.125%							2.125%
Face amount of debt instrument							$ 1,100	$ 1,100						$ 1,100
2009 Shelf Registration Statement-$650 issued at discount to par at a price of 99.911% in December 2010 at 2.2%, due December 2015
Long-term debt
Total		650			650		$ 650
Discount to par (as a percent)				99.911%			99.911%						99.911%
Interest rate (as a percent)				2.20%			2.20%						2.20%
Face amount of debt instrument				$ 650			$ 650						$ 650
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
Total		1,349			1,349		$ 1,349
Discount to par (as a percent)				99.827%			99.827%						99.827%
Interest rate (as a percent)				3.75%			3.75%						3.75%
Face amount of debt instrument				$ 1,350			$ 1,350						$ 1,350
2009 Shelf Registration Statement-$1,000 issued at discount to par at a price of 99.958% in May 2011 at 2.65%, due June 2016
Long-term debt
Total		1,000			1,000		$ 1,000
Discount to par (as a percent)				99.958%			99.958%					99.958%
Interest rate (as a percent)				2.65%			2.65%					2.65%
Face amount of debt instrument				$ 1,000			$ 1,000					$ 1,000
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
Long-term debt
Total		1,248			1,248		$ 1,248
Discount to par (as a percent)				99.799%			99.799%					99.799%
Interest rate (as a percent)				4.30%			4.30%					4.30%
Face amount of debt instrument				$ 1,250			$ 1,250					$ 1,250
2009 Shelf Registration Statement-$750 issued at discount to par at a price of 99.977% in September 2011 at 2.35%, paid March 2015
Long-term debt
Total							$ 750
Discount to par (as a percent)				99.977%			99.977%				99.977%
Interest rate (as a percent)				2.35%			2.35%				2.35%
Face amount of debt instrument				$ 750			$ 750				$ 750
2009 Shelf Registration Statement-$1,300 issued at discount to par at a price of 99.784% in September 2011 at 3.0%, due September 2016
Long-term debt
Total		1,299			1,299		$ 1,298
Discount to par (as a percent)				99.784%			99.784%				99.784%
Interest rate (as a percent)				3.00%			3.00%				3.00%
Face amount of debt instrument				$ 1,300			$ 1,300				$ 1,300
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
Total		999			999		$ 999
Discount to par (as a percent)				99.816%			99.816%				99.816%
Interest rate (as a percent)				4.375%			4.375%				4.375%
Face amount of debt instrument				$ 1,000			$ 1,000				$ 1,000
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
Long-term debt
Total		1,199			1,199		$ 1,199
Discount to par (as a percent)				99.863%			99.863%				99.863%
Interest rate (as a percent)				6.00%			6.00%				6.00%
Face amount of debt instrument				$ 1,200			$ 1,200				$ 1,200
2009 Shelf Registration Statement-$650 issued at discount to par at a price of 99.946% in December 2011 at 2.625%, paid December 2014
Long-term debt
Total							$ 650
Discount to par (as a percent)				99.946%			99.946%			99.946%
Interest rate (as a percent)				2.625%			2.625%			2.625%
Face amount of debt instrument				$ 650			$ 650			$ 650
2009 Shelf Registration Statement-$850 issued at discount to par at a price of 99.790% in December 2011 at 3.3%, due December 2016
Long-term debt
Total		850			850		$ 849
Discount to par (as a percent)				99.79%			99.79%			99.79%
Interest rate (as a percent)				3.30%			3.30%			3.30%
Face amount of debt instrument				$ 850			$ 850			$ 850
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
Total		1,496			1,496		$ 1,496
Discount to par (as a percent)				99.707%			99.707%			99.707%
Interest rate (as a percent)				4.65%			4.65%			4.65%
Face amount of debt instrument				$ 1,500			$ 1,500			$ 1,500
2009 Shelf Registration Statement-$1,500 issued at discount to par at a price of 99.985% in March 2012 at 2.6%, due September 2017
Long-term debt
Total		1,500			1,500		$ 1,500
Discount to par (as a percent)				99.985%			99.985%		99.985%
Interest rate (as a percent)				2.60%			2.60%		2.60%
Face amount of debt instrument				$ 1,500			$ 1,500		$ 1,500
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
Total		499			499		$ 499
Discount to par (as a percent)				99.771%			99.771%		99.771%
Interest rate (as a percent)				4.05%			4.05%		4.05%
Face amount of debt instrument				$ 500			$ 500		$ 500
2012 Shelf Registration Statement-$750 issued at par in January 2014 at three-month USD LIBOR plus 0.94%, due January 2019
Long-term debt
Total		750			750		750
Face amount of debt instrument	$ 750			$ 750			$ 750
Reference interest rate	three-month Libor			three-month Libor			three-month Libor
Spread on reference interest rate (as a percent)	0.94%			0.94%			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
Long-term debt
Total		1,250			1,250		$ 1,250
Discount to par (as a percent)	99.954%			99.954%			99.954%
Interest rate (as a percent)	2.75%			2.75%			2.75%
Face amount of debt instrument	$ 1,250			$ 1,250			$ 1,250
EDS Senior Notes-$300 issued October 1999 at 7.45%, due October 2029
Long-term debt
Total		313			313		$ 313
Interest rate (as a percent)				7.45%			7.45%										7.45%
Face amount of debt instrument				$ 300			$ 300										$ 300
Other, including capital lease obligations, at 0.00%-8.30%, due in calendar years 2015-2024
Long-term debt
Other, including capital lease obligations		513			513		$ 424
Minimum interest rate (as a percent)				0.00%			0.00%
Maximum interest rate (as a percent)				8.30%			8.30%
Other, including capital lease obligations, at 0.00%-8.30%, due in calendar years 2015-2024 | HP Financial Services
Long-term debt
Other, including capital lease obligations		$ 173			$ 173		$ 123