Accumulated Other Comprehensive Income - Changes in AOCI (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Aug. 31, 2013
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at May 31, 2013	$ 274
Other comprehensive gains (losses) before reclassifications (2)	(68)	[1]
Reclassifications to net income of previously deferred (gains) losses (3)	(29)	[2]
Other comprehensive income (loss)	(97)
Balance at August 31, 2013	177
Foreign Currency Translation Adjustment
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at May 31, 2013	41	[3]
Other comprehensive gains (losses) before reclassifications (2)	(31)	[1],[3]
Reclassifications to net income of previously deferred (gains) losses (3)	0	[2],[3]
Other comprehensive income (loss)	(31)	[3]
Balance at August 31, 2013	10	[3]
Other comprehensive income, before reclassification, tax benefit (expense)	0
Reclassification from accumulated other comprehensive income, tax (benefit) expense	0
Cash Flow Hedges
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at May 31, 2013	193
Other comprehensive gains (losses) before reclassifications (2)	(35)	[1]
Reclassifications to net income of previously deferred (gains) losses (3)	(30)	[2]
Other comprehensive income (loss)	(65)
Balance at August 31, 2013	128
Other comprehensive income, before reclassification, tax benefit (expense)	(2)
Reclassification from accumulated other comprehensive income, tax (benefit) expense	5
Net Investment Hedges
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at May 31, 2013	95	[3]
Other comprehensive gains (losses) before reclassifications (2)	0	[1],[3]
Reclassifications to net income of previously deferred (gains) losses (3)	0	[2],[3]
Other comprehensive income (loss)	0	[3]
Balance at August 31, 2013	95	[3]
Other comprehensive income, before reclassification, tax benefit (expense)	0
Reclassification from accumulated other comprehensive income, tax (benefit) expense	0
Other
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at May 31, 2013	(55)
Other comprehensive gains (losses) before reclassifications (2)	(2)	[1]
Reclassifications to net income of previously deferred (gains) losses (3)	1	[2]
Other comprehensive income (loss)	(1)
Balance at August 31, 2013	(56)
Other comprehensive income, before reclassification, tax benefit (expense)	0
Reclassification from accumulated other comprehensive income, tax (benefit) expense	$ 0

[1] Net of tax (expense) of $0 million, $(2) million, $0 million, $0 million, respectively.

[2] Net of tax expense of $0 million, $5 million, $0 million, $0 million, respectively.

[3] The accumulated foreign currency translation adjustment and net investment hedge (gains) losses related to an investment in a foreign subsidiary are reclassified to net income upon sale or upon complete or substantially complete liquidation of the entity.