Accumulated Other Comprehensive Income - Changes in AOCI (Detail) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Nov. 30, 2017	Nov. 30, 2016	Nov. 30, 2017	Nov. 30, 2016
AOCI Including Portion Attributable to Noncontrolling, Net of Tax [Roll Forward]
Beginning balance			$ 12,407
Other comprehensive gains (losses) before reclassifications, net of tax	$ (30)	$ 455	(373)	$ 411
Reclassifications to net income of previously deferred (gains) losses, net of tax	29	(141)	(1)	(330)
Total other comprehensive income (loss), net of tax	(1)	314	(374)	81
Ending balance	11,758		11,758
Other comprehensive income, before reclassification, tax benefit (expense)	(8)	(24)	(24)	23
Reclassification from AOCI, Current Period, Tax	(2)	(2)	(3)	(3)
Foreign Currency Translation Adjustment
AOCI Including Portion Attributable to Noncontrolling, Net of Tax [Roll Forward]
Beginning balance	(169)	(204)	(191)	(207)
Other comprehensive gains (losses) before reclassifications, net of tax	(8)	(14)	14	(11)
Reclassifications to net income of previously deferred (gains) losses, net of tax	0	0	0	0
Total other comprehensive income (loss), net of tax	(8)	(14)	14	(11)
Ending balance	(177)	(218)	(177)	(218)
Other comprehensive income, before reclassification, tax benefit (expense)	(4)	0	(23)	0
Reclassification from AOCI, Current Period, Tax	0	0	0	0
Cash Flow Hedges
AOCI Including Portion Attributable to Noncontrolling, Net of Tax [Roll Forward]
Beginning balance	(447)	223	(52)	463
Other comprehensive gains (losses) before reclassifications, net of tax	(20)	464	(367)	404
Reclassifications to net income of previously deferred (gains) losses, net of tax	28	(141)	(20)	(321)
Total other comprehensive income (loss), net of tax	8	323	(387)	83
Ending balance	(439)	546	(439)	546
Other comprehensive income, before reclassification, tax benefit (expense)	(4)	(24)	(1)	22
Reclassification from AOCI, Current Period, Tax	(2)	(2)	(3)	(2)
Net Investment Hedges
AOCI Including Portion Attributable to Noncontrolling, Net of Tax [Roll Forward]
Beginning balance	115	115	115	115
Other comprehensive gains (losses) before reclassifications, net of tax	0	0	0	0
Reclassifications to net income of previously deferred (gains) losses, net of tax	0	0	0	0
Total other comprehensive income (loss), net of tax	0	0	0	0
Ending balance	115	115	115	115
Other comprehensive income, before reclassification, tax benefit (expense)	0	0	0	0
Reclassification from AOCI, Current Period, Tax	0	0	0	0
Other
AOCI Including Portion Attributable to Noncontrolling, Net of Tax [Roll Forward]
Beginning balance	(85)	(49)	(85)	(53)
Other comprehensive gains (losses) before reclassifications, net of tax	(2)	5	(20)	18
Reclassifications to net income of previously deferred (gains) losses, net of tax	1	0	19	(9)
Total other comprehensive income (loss), net of tax	(1)	5	(1)	9
Ending balance	(86)	(44)	(86)	(44)
Other comprehensive income, before reclassification, tax benefit (expense)	0	0	0	1
Reclassification from AOCI, Current Period, Tax	0	0	0	(1)
Total
AOCI Including Portion Attributable to Noncontrolling, Net of Tax [Roll Forward]
Beginning balance	(586)	85	(213)	318
Ending balance	$ (587)	$ 399	$ (587)	$ 399

Amount after tax, before reclassification adjustments of other comprehensive income (loss).

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