Accumulated Other Comprehensive Income - Changes in AOCI (Detail) - USD ($) $ in Millions	12 Months Ended
	May 31, 2016	May 31, 2015	May 31, 2014
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ 1,246	$ 85
Other comprehensive gains (losses) before reclassifications, net of tax	(219)	1,460
Reclassifications to net income of previously deferred (gains) losses, net of tax	(709)	(299)
Total other comprehensive income (loss), net of tax	(928)	1,161	$ (189)
Ending balance	318	1,246	85
Other comprehensive income, before reclassification, tax benefit (expense)	26	(33)
Reclassification from accumulated other comprehensive income, tax (benefit) expense	9	2
Foreign Currency Translation Adjustment
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(31)	(11)
Other comprehensive gains (losses) before reclassifications, net of tax	(178)	(20)
Reclassifications to net income of previously deferred (gains) losses, net of tax	2	0
Total other comprehensive income (loss), net of tax	(176)	(20)
Ending balance	(207)	(31)	(11)
Other comprehensive income, before reclassification, tax benefit (expense)	0	0
Reclassification from accumulated other comprehensive income, tax (benefit) expense	0	0
Foreign Currency Translation Adjustment | Revisions
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(20)	(20)
Ending balance		(20)	(20)
Cash Flow Hedges
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	1,220	32
Other comprehensive gains (losses) before reclassifications, net of tax	(47)	1,447
Reclassifications to net income of previously deferred (gains) losses, net of tax	(710)	(259)
Total other comprehensive income (loss), net of tax	(757)	1,188
Ending balance	463	1,220	32
Other comprehensive income, before reclassification, tax benefit (expense)	28	(33)
Reclassification from accumulated other comprehensive income, tax (benefit) expense	7	2
Net Investment Hedges
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	115	115
Other comprehensive gains (losses) before reclassifications, net of tax	0	0
Reclassifications to net income of previously deferred (gains) losses, net of tax	0	0
Total other comprehensive income (loss), net of tax	0	0
Ending balance	115	115	115
Other comprehensive income, before reclassification, tax benefit (expense)	0	0
Reclassification from accumulated other comprehensive income, tax (benefit) expense	0	0
Net Investment Hedges | Revisions
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	20	20
Ending balance		20	20
Other
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(58)	(51)
Other comprehensive gains (losses) before reclassifications, net of tax	6	33
Reclassifications to net income of previously deferred (gains) losses, net of tax	(1)	(40)
Total other comprehensive income (loss), net of tax	5	(7)
Ending balance	(53)	(58)	$ (51)
Other comprehensive income, before reclassification, tax benefit (expense)	(2)	0
Reclassification from accumulated other comprehensive income, tax (benefit) expense	$ 2	$ 0