Accumulated Other Comprehensive Income - Changes in AOCI (Detail) - USD ($) $ in Millions	3 Months Ended
	Aug. 31, 2015		Aug. 31, 2014
AOCI Including Portion Attributable to Noncontrolling, net of Tax [Roll Forward]
Accumulated other comprehensive income balance at the beginning of the period	$ 1,246		$ 85
Other comprehensive gains (losses) before reclassifications, net of tax	(263)	[1]	126	[2]
Reclassifications to net income of previously deferred (gains) losses, net of tax	(150)	[3]	13	[4]
Total other comprehensive income (loss), net of tax	(413)		139
Accumulated other comprehensive income balance at the end of the period	833		224
Other comprehensive income, before reclassification, tax benefit (expense)	(2)		(12)
Reclassification from accumulated other comprehensive income, tax (benefit) expense	1		(3)
Foreign Currency Translation Adjustment
AOCI Including Portion Attributable to Noncontrolling, net of Tax [Roll Forward]
Accumulated other comprehensive income balance at the beginning of the period	(11)	[5]	9	[6]
Other comprehensive gains (losses) before reclassifications, net of tax	(81)	[1],[5]	2	[2],[6]
Reclassifications to net income of previously deferred (gains) losses, net of tax	0	[3],[5]	0	[4],[6]
Total other comprehensive income (loss), net of tax	(81)	[5]	2	[6]
Accumulated other comprehensive income balance at the end of the period	(92)	[5]	11	[6]
Other comprehensive income, before reclassification, tax benefit (expense)	0		(11)
Reclassification from accumulated other comprehensive income, tax (benefit) expense	0		0
Cash Flow Hedges
AOCI Including Portion Attributable to Noncontrolling, net of Tax [Roll Forward]
Accumulated other comprehensive income balance at the beginning of the period	1,220		32
Other comprehensive gains (losses) before reclassifications, net of tax	(182)	[1]	119	[2]
Reclassifications to net income of previously deferred (gains) losses, net of tax	(147)	[3]	16	[4]
Total other comprehensive income (loss), net of tax	(329)		135
Accumulated other comprehensive income balance at the end of the period	891		167
Other comprehensive income, before reclassification, tax benefit (expense)	(2)		1
Reclassification from accumulated other comprehensive income, tax (benefit) expense	1		(4)
Net Investment Hedges
AOCI Including Portion Attributable to Noncontrolling, net of Tax [Roll Forward]
Accumulated other comprehensive income balance at the beginning of the period	95	[5]	95	[6]
Other comprehensive gains (losses) before reclassifications, net of tax	0	[1],[5]	0	[2],[6]
Reclassifications to net income of previously deferred (gains) losses, net of tax	0	[3],[5]	0	[4],[6]
Total other comprehensive income (loss), net of tax	0	[5]	0	[6]
Accumulated other comprehensive income balance at the end of the period	95	[5]	95	[6]
Other comprehensive income, before reclassification, tax benefit (expense)	0		0
Reclassification from accumulated other comprehensive income, tax (benefit) expense	0		0
Other
AOCI Including Portion Attributable to Noncontrolling, net of Tax [Roll Forward]
Accumulated other comprehensive income balance at the beginning of the period	(58)		(51)
Other comprehensive gains (losses) before reclassifications, net of tax	0	[1]	5	[2]
Reclassifications to net income of previously deferred (gains) losses, net of tax	(3)	[3]	(3)	[4]
Total other comprehensive income (loss), net of tax	(3)		2
Accumulated other comprehensive income balance at the end of the period	(61)		(49)
Other comprehensive income, before reclassification, tax benefit (expense)	0		(2)
Reclassification from accumulated other comprehensive income, tax (benefit) expense	$ 0		$ 1

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

[2] Net of tax benefit (expense) of $(11) million, $1 million, $0 million, $(2) million and $(12) million, respectively.

[3] Net of tax (benefit) expense of $0 million, $1 million, $0 million, $0 million and $1 million, respectively.

[4] Net of tax (benefit) expense of $0 million, $(4) million, $0 million, $1 million and $(3) million, respectively.

[5] 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.

[6] 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.