Accumulated Other Comprehensive Income - Changes in AOCI (Detail) - USD ($) $ in Millions	3 Months Ended
	Aug. 31, 2016	Aug. 31, 2015
AOCI Including Portion Attributable to Noncontrolling, Net of Tax [Roll Forward]
Beginning balance	$ 318	$ 1,246
Other comprehensive gains (losses) before reclassifications, net of tax	(44)	(223)
Reclassifications to net income of previously deferred (gains) losses, net of tax	(189)	(190)
Total other comprehensive income (loss), net of tax	(233)	(413)
Ending balance	85	833
Other comprehensive income, before reclassification, tax benefit (expense)	47	(2)
Reclassification from accumulated other comprehensive income, tax (benefit) expense	(1)	1
Foreign Currency Translation Adjustment
AOCI Including Portion Attributable to Noncontrolling, Net of Tax [Roll Forward]
Beginning balance	(207)	(31)
Other comprehensive gains (losses) before reclassifications, net of tax	3	(81)
Reclassifications to net income of previously deferred (gains) losses, net of tax	0	0
Total other comprehensive income (loss), net of tax	3	(81)
Ending balance	(204)	(112)
Other comprehensive income, before reclassification, tax benefit (expense)	0	0
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]
Beginning balance	463	1,220
Other comprehensive gains (losses) before reclassifications, net of tax	(60)	(142)
Reclassifications to net income of previously deferred (gains) losses, net of tax	(180)	(187)
Total other comprehensive income (loss), net of tax	(240)	(329)
Ending balance	223	891
Other comprehensive income, before reclassification, tax benefit (expense)	46	(2)
Reclassification from accumulated other comprehensive income, tax (benefit) expense	0	1
Net Investment Hedges
AOCI Including Portion Attributable to Noncontrolling, Net of Tax [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
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]
Beginning balance	(53)	(58)
Other comprehensive gains (losses) before reclassifications, net of tax	13	0
Reclassifications to net income of previously deferred (gains) losses, net of tax	(9)	(3)
Total other comprehensive income (loss), net of tax	4	(3)
Ending balance	(49)	(61)
Other comprehensive income, before reclassification, tax benefit (expense)	1	0
Reclassification from accumulated other comprehensive income, tax (benefit) expense	$ (1)	0
Revisions | Foreign Currency Translation Adjustment
AOCI Including Portion Attributable to Noncontrolling, Net of Tax [Roll Forward]
Ending balance		(20)
Revisions | Cash Flow Hedges
AOCI Including Portion Attributable to Noncontrolling, Net of Tax [Roll Forward]
Other comprehensive gains (losses) before reclassifications, net of tax		40
Reclassifications to net income of previously deferred (gains) losses, net of tax		(40)
Revisions | Net Investment Hedges
AOCI Including Portion Attributable to Noncontrolling, Net of Tax [Roll Forward]
Ending balance		$ 20