RESTRUCTURING ACTIVITIES (Details) (USD $) In Millions	12 Months Ended
	May 31, 2011	May 31, 2010	May 31, 2009	May 31, 2008
Restructuring costs [Abstract]
Accrued at period end	$ 449	$ 546
Sun Restructuring Plan [Member] | Total Sun Restructuring [Member]
Restructuring costs [Abstract]
Accrued at period end	152	87
Initial Costs	447	342
Adjustments to Cost	(8)
Cash Payments	(369)	(248)
Others	(5)	(7)
Total Costs Accrued to Date	781
Total Expected Program Costs	1,031
Other Restructuring Plans [Member]
Restructuring costs [Abstract]
Accrued at period end	297	459	389
Initial Costs	57	292
Adjustments to Cost (Other Plans)	(17)	(84)
Cash Payments	(223)	(397)
Others	21	259
Total Restructuring Plans [Member]
Restructuring costs [Abstract]
Accrued at period end	449	546	389	568
Initial Costs	504	634	111
Adjustments to Cost (Other Plans)	(25)	(84)	(12)
Cash Payments	(592)	(645)	(253)
Others	16	252	(25)
New software licenses (restructuring) [Member]
Restructuring costs [Abstract]
Accrued at period end	14	5
Initial Costs	67	6
Adjustments to Cost	(4)
Cash Payments	(55)	(1)
Others	1
Total Costs Accrued to Date	69
Total Expected Program Costs	88
Software license updates and product support (restructuring) [Member]
Restructuring costs [Abstract]
Accrued at period end	19	3
Initial Costs	52	6
Adjustments to Cost	(1)
Cash Payments	(34)	(3)
Others	(1)
Total Costs Accrued to Date	57
Total Expected Program Costs	89
Hardware systems business (restructuring) [Member]
Restructuring costs [Abstract]
Accrued at period end	10	42
Initial Costs	53	61
Adjustments to Cost	(3)
Cash Payments	(83)	(19)
Others	1
Total Costs Accrued to Date	111
Total Expected Program Costs	120
Services (restructuring) [Member]
Restructuring costs [Abstract]
Accrued at period end	9	8
Initial Costs	49	11
Adjustments to Cost	(4)
Cash Payments	(43)	(3)
Others	(1)
Total Costs Accrued to Date	56
Total Expected Program Costs	74
General and administrative and other (restructuring) [Member]
Restructuring costs [Abstract]
Accrued at period end	100	29
Initial Costs	226	258
Adjustments to Cost	4
Cash Payments	(154)	(222)
Others	(5)	(7)
Total Costs Accrued to Date	488
Total Expected Program Costs	$ 660