Accumulated Other Comprehensive Income - Changes in AOCI (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Nov. 30, 2013		Nov. 30, 2013
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accumulated other comprehensive income balance at the beginning of the period	$ 177		$ 274
Other comprehensive gains (losses) before reclassifications, net of tax	(73)	[1]	(141)	[1]
Reclassifications to net income of previously deferred (gains) losses, net of tax	14	[2]	43	[2]
Other comprehensive income (loss)	(87)		(184)
Accumulated other comprehensive income balance at the end of the period	90		90
Foreign Currency Translation Adjustment
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accumulated other comprehensive income balance at the beginning of the period	10	[3]	41	[3]
Other comprehensive gains (losses) before reclassifications, net of tax	14	[1],[3]	(17)	[1],[3]
Reclassifications to net income of previously deferred (gains) losses, net of tax	0	[2],[3]	0	[2],[3]
Other comprehensive income (loss)	14	[3]	(17)	[3]
Accumulated other comprehensive income balance at the end of the period	24	[3]	24	[3]
Other comprehensive income, before reclassification, tax benefit (expense)	0		0
Reclassification from accumulated other comprehensive income, tax (benefit) expense	0		0
Cash Flow Hedges
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accumulated other comprehensive income balance at the beginning of the period	128		193
Other comprehensive gains (losses) before reclassifications, net of tax	(85)	[1]	(120)	[1]
Reclassifications to net income of previously deferred (gains) losses, net of tax	15	[2]	45	[2]
Other comprehensive income (loss)	(100)		(165)
Accumulated other comprehensive income balance at the end of the period	28		28
Other comprehensive income, before reclassification, tax benefit (expense)	9		7
Reclassification from accumulated other comprehensive income, tax (benefit) expense	5		10
Net Investment Hedges
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accumulated other comprehensive income balance at the beginning of the period	95	[3]	95	[3]
Other comprehensive gains (losses) before reclassifications, net of tax	0	[1],[3]	0	[1],[3]
Reclassifications to net income of previously deferred (gains) losses, net of tax	0	[2],[3]	0	[2],[3]
Other comprehensive income (loss)	0	[3]	0	[3]
Accumulated other comprehensive income balance at the end of the period	95	[3]	95	[3]
Other comprehensive income, before reclassification, tax benefit (expense)	0		0
Reclassification from accumulated other comprehensive income, tax (benefit) expense	0		0
Other
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accumulated other comprehensive income balance at the beginning of the period	(56)		(55)
Other comprehensive gains (losses) before reclassifications, net of tax	(2)	[1]	(4)	[1]
Reclassifications to net income of previously deferred (gains) losses, net of tax	(1)	[2]	(2)	[2]
Other comprehensive income (loss)	(1)		(2)
Accumulated other comprehensive income balance at the end of the period	(57)		(57)
Other comprehensive income, before reclassification, tax benefit (expense)	0		0
Reclassification from accumulated other comprehensive income, tax (benefit) expense	$ 0		$ 0

[1] Net of tax benefit of $0 million, $7 million, $0 million, $0 million, respectively.

[2] Net of tax expense of $0 million, $10 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 respective entity.