Stockholders' Equity (Details 3) $ in Millions	3 Months Ended
	Jan. 31, 2016 USD ($)
Components of accumulated other comprehensive income, net of taxes
Balance at beginning of period	$ 27,768
Balance at end of period	(4,909)
Change in unrealized gains on available-for-sale securities
Components of accumulated other comprehensive income, net of taxes
Balance at beginning of period	66
Separation of Hewlett Packard Enterprise	(55)
Balance at end of period	11
Change in unrealized (losses) gains on cash flow hedges
Components of accumulated other comprehensive income, net of taxes
Balance at beginning of period	(39)
Separation of Hewlett Packard Enterprise	(68)
Other comprehensive income before reclassifications	116
Reclassifications of (gains) losses into earnings	(26)
Balance at end of period	(17)
Change in unrealized components of defined benefit plans
Components of accumulated other comprehensive income, net of taxes
Balance at beginning of period	(5,355)
Separation of Hewlett Packard Enterprise	4,230
Reclassifications of (gains) losses into earnings	9
Balance at end of period	(1,116)
Change in cumulative translation adjustment
Components of accumulated other comprehensive income, net of taxes
Balance at beginning of period	(974)
Separation of Hewlett Packard Enterprise	974
Accumulated Other Comprehensive (Loss) Income
Components of accumulated other comprehensive income, net of taxes
Balance at beginning of period	(6,302)
Separation of Hewlett Packard Enterprise	5,081
Other comprehensive income before reclassifications	116
Reclassifications of (gains) losses into earnings	(17)
Balance at end of period	$ (1,122)