Borrowings (Details 2) (USD $) In Millions, unless otherwise specified																									1 Months Ended	6 Months Ended	12 Months Ended										1 Months Ended	6 Months Ended	12 Months Ended																												1 Months Ended	6 Months Ended						6 Months Ended	12 Months Ended
	Apr. 30, 2014	Oct. 31, 2013	Apr. 30, 2014 U.S. Dollar Global Notes	Oct. 31, 2013 U.S. Dollar Global Notes	Apr. 30, 2014 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	Oct. 31, 2013 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	Feb. 28, 2007 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	Apr. 30, 2014 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	Oct. 31, 2013 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	Mar. 31, 2008 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	Oct. 31, 2013 2006 Shelf Registration Statement-$2,000 issued at discount to par at a price of 99.561% in December 2008 at 6.125%, paid March 2014	Dec. 31, 2008 2006 Shelf Registration Statement-$2,000 issued at discount to par at a price of 99.561% in December 2008 at 6.125%, paid March 2014	Apr. 30, 2014 2006 Shelf Registration Statement-$1,500 issued at discount to par at a price of 99.993% in February 2009 at 4.75%, paid June 2014	Oct. 31, 2013 2006 Shelf Registration Statement-$1,500 issued at discount to par at a price of 99.993% in February 2009 at 4.75%, paid June 2014	Feb. 28, 2009 2006 Shelf Registration Statement-$1,500 issued at discount to par at a price of 99.993% in February 2009 at 4.75%, paid June 2014	Apr. 30, 2014 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	Oct. 31, 2013 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	Sep. 30, 2010 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	Apr. 30, 2014 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	Oct. 31, 2013 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	Dec. 31, 2010 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	Apr. 30, 2014 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	Oct. 31, 2013 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	Dec. 31, 2010 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	May 31, 2011	Apr. 30, 2014	Oct. 31, 2013	Apr. 30, 2014 2009 Shelf Registration Statement-$500 issued at discount to par at a price of 99.971% in May 2011 at 1.55%, paid May 2014	Oct. 31, 2013 2009 Shelf Registration Statement-$500 issued at discount to par at a price of 99.971% in May 2011 at 1.55%, paid May 2014	May 31, 2011 2009 Shelf Registration Statement-$500 issued at discount to par at a price of 99.971% in May 2011 at 1.55%, paid May 2014	Apr. 30, 2014 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	Oct. 31, 2013 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	May 31, 2011 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	Apr. 30, 2014 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	Oct. 31, 2013 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	May 31, 2011 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	Sep. 30, 2011	Apr. 30, 2014	Oct. 31, 2013	Apr. 30, 2014 2009 Shelf Registration Statement-$750 issued at discount to par at a price of 99.977% in September 2011 at 2.35%, due March 2015	Oct. 31, 2013 2009 Shelf Registration Statement-$750 issued at discount to par at a price of 99.977% in September 2011 at 2.35%, due March 2015	Sep. 30, 2011 2009 Shelf Registration Statement-$750 issued at discount to par at a price of 99.977% in September 2011 at 2.35%, due March 2015	Apr. 30, 2014 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	Oct. 31, 2013 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	Sep. 30, 2011 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	Apr. 30, 2014 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	Oct. 31, 2013 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	Sep. 30, 2011 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	Apr. 30, 2014 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	Oct. 31, 2013 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	Sep. 30, 2011 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	Apr. 30, 2014 2009 Shelf Registration Statement-$650 issued at discount to par at a price of 99.946% in December 2011 at 2.625%, due December 2014	Oct. 31, 2013 2009 Shelf Registration Statement-$650 issued at discount to par at a price of 99.946% in December 2011 at 2.625%, due December 2014	Dec. 31, 2011 2009 Shelf Registration Statement-$650 issued at discount to par at a price of 99.946% in December 2011 at 2.625%, due December 2014	Apr. 30, 2014 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	Oct. 31, 2013 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	Dec. 31, 2011 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	Apr. 30, 2014 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	Oct. 31, 2013 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	Dec. 31, 2011 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	Apr. 30, 2014 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	Oct. 31, 2013 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	Mar. 31, 2012 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	Apr. 30, 2014 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	Oct. 31, 2013 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	Mar. 31, 2012 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	Jan. 31, 2014	Apr. 30, 2014	Apr. 30, 2014 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	Jan. 31, 2014 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	Apr. 30, 2014 EDS Senior Notes-$300 issued October 1999 at 7.45%, due October 2029	Oct. 31, 2013 EDS Senior Notes-$300 issued October 1999 at 7.45%, due October 2029	Oct. 31, 1999 EDS Senior Notes-$300 issued October 1999 at 7.45%, due October 2029	Apr. 30, 2014 Other, including capital lease obligations, at 0.00%-8.50%, due in calendar years 2014-2024	Oct. 31, 2013 Other, including capital lease obligations, at 0.00%-8.50%, due in calendar years 2014-2024	Apr. 30, 2014 Other, including capital lease obligations, at 0.00%-8.50%, due in calendar years 2014-2024 HPFS and its subsidiaries	Oct. 31, 2013 Other, including capital lease obligations, at 0.00%-8.50%, due in calendar years 2014-2024 HPFS and its subsidiaries
Long-term debt
Total	$ 17,190	$ 16,608	$ 20,685	$ 20,684	$ 500	$ 499		$ 750	$ 750		$ 1,999		$ 1,500	$ 1,500		$ 1,100	$ 1,100		$ 650	$ 650		$ 1,349	$ 1,349			$ 500	$ 500	$ 500	$ 500		$ 1,000	$ 1,000		$ 1,248	$ 1,248			$ 350	$ 350	$ 750	$ 750		$ 1,298	$ 1,298		$ 999	$ 999		$ 1,198	$ 1,198		$ 650	$ 650		$ 849	$ 849		$ 1,496	$ 1,496		$ 1,500	$ 1,500		$ 499	$ 499			$ 750	$ 1,249		$ 314	$ 314
Other, including capital lease obligations																																																																										689	689	177	244
Fair value adjustment related to hedged debt	86	147
Less: current portion	(4,584)	(5,226)
Discount to par (as a percent)					99.694%	99.694%	99.694%	99.932%	99.932%	99.932%	99.561%	99.561%	99.993%	99.993%	99.993%	99.887%	99.887%	99.887%	99.911%	99.911%	99.911%	99.827%	99.827%	99.827%				99.971%	99.971%	99.971%	99.958%	99.958%	99.958%	99.799%	99.799%	99.799%				99.977%	99.977%	99.977%	99.784%	99.784%	99.784%	99.816%	99.816%	99.816%	99.863%	99.863%	99.863%	99.946%	99.946%	99.946%	99.79%	99.79%	99.79%	99.707%	99.707%	99.707%	99.985%	99.985%	99.985%	99.771%	99.771%	99.771%			99.954%	99.954%
Interest rate (as a percent)					5.40%	5.40%	5.40%	5.50%	5.50%	5.50%	6.125%	6.125%	4.75%	4.75%	4.75%	2.125%	2.125%	2.125%	2.20%	2.20%	2.20%	3.75%	3.75%	3.75%				1.55%	1.55%	1.55%	2.65%	2.65%	2.65%	4.30%	4.30%	4.30%				2.35%	2.35%	2.35%	3.00%	3.00%	3.00%	4.375%	4.375%	4.375%	6.00%	6.00%	6.00%	2.625%	2.625%	2.625%	3.30%	3.30%	3.30%	4.65%	4.65%	4.65%	2.60%	2.60%	2.60%	4.05%	4.05%	4.05%			2.75%	2.75%	7.45%	7.45%	7.45%
Face amount of debt instrument					$ 500	$ 500	$ 500	$ 750	$ 750	$ 750	$ 2,000	$ 2,000	$ 1,500	$ 1,500	$ 1,500	$ 1,100	$ 1,100	$ 1,100	$ 650	$ 650	$ 650	$ 1,350	$ 1,350	$ 1,350	$ 500	$ 500	$ 500	$ 500	$ 500	$ 500	$ 1,000	$ 1,000	$ 1,000	$ 1,250	$ 1,250	$ 1,250	$ 350	$ 350	$ 350	$ 750	$ 750	$ 750	$ 1,300	$ 1,300	$ 1,300	$ 1,000	$ 1,000	$ 1,000	$ 1,200	$ 1,200	$ 1,200	$ 650	$ 650	$ 650	$ 850	$ 850	$ 850	$ 1,500	$ 1,500	$ 1,500	$ 1,500	$ 1,500	$ 1,500	$ 500	$ 500	$ 500	$ 750	$ 750	$ 1,250	$ 1,250	$ 300	$ 300	$ 300
Reference interest rate																									three-month USD LIBOR	three-month USD LIBOR	three-month USD LIBOR										three-month USD LIBOR	three-month USD LIBOR	three-month USD LIBOR																												three-month USD LIBOR	three-month USD LIBOR
Spread on reference interest rate (as a percent)																									0.40%	0.40%	0.40%										1.55%	1.55%	1.55%																												0.94%	0.94%
Minimum interest rate (as a percent)																																																																										0.00%	0.00%
Maximum interest rate (as a percent)																																																																										8.50%	8.50%