Accumulated Other Comprehensive Income (Loss) - Changes in AOCI (Detail) - USD ($) $ in Millions	12 Months Ended
	May 31, 2019	May 31, 2018	May 31, 2017
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ 9,812	$ 12,407	$ 12,258
Other comprehensive income (loss):
Other comprehensive gains (losses) before reclassifications, net of tax	410	(56)
Reclassifications to net income of previously deferred (gains) losses, net of tax	(87)	160
Total other comprehensive income (loss), net of tax	323	104	(531)
Reclassifications to retained earnings in accordance with ASU 2018-02		17
Ending balance	9,040	9,812	12,407
Other comprehensive income, before reclassification, tax benefit (expense)	(3)	(31)
Reclassification from AOCI, current period, tax expense (benefit)	6	(3)
Foreign Currency Translation Adjustment
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(173)	(191)
Other comprehensive income (loss):
Other comprehensive gains (losses) before reclassifications, net of tax	(173)	(6)
Reclassifications to net income of previously deferred (gains) losses, net of tax	0	0
Total other comprehensive income (loss), net of tax	(173)	(6)
Reclassifications to retained earnings in accordance with ASU 2018-02		24
Ending balance	(346)	(173)	(191)
Other comprehensive income, before reclassification, tax benefit (expense)	0	(24)
Reclassification from AOCI, current period, tax expense (benefit)	0	0
CASH FLOW HEDGES
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	17	(52)
Other comprehensive income (loss):
Other comprehensive gains (losses) before reclassifications, net of tax	573	(52)
Reclassifications to net income of previously deferred (gains) losses, net of tax	(70)	128
Total other comprehensive income (loss), net of tax	503	76
Reclassifications to retained earnings in accordance with ASU 2018-02		(7)
Ending balance	520	17	(52)
Other comprehensive income, before reclassification, tax benefit (expense)	(4)	(3)
Reclassification from AOCI, current period, tax expense (benefit)	6	(3)
Net Investment Hedges
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	115	115
Other comprehensive income (loss):
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
Reclassifications to retained earnings in accordance with ASU 2018-02		0
Ending balance	115	115	115
Other comprehensive income, before reclassification, tax benefit (expense)	0	0
Reclassification from AOCI, current period, tax expense (benefit)	0	0
OTHER
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(51)	(85)
Other comprehensive income (loss):
Other comprehensive gains (losses) before reclassifications, net of tax	10	2
Reclassifications to net income of previously deferred (gains) losses, net of tax	(17)	32
Total other comprehensive income (loss), net of tax	(7)	34
Reclassifications to retained earnings in accordance with ASU 2018-02		0
Ending balance	(58)	(51)	(85)
Other comprehensive income, before reclassification, tax benefit (expense)	1	(4)
Reclassification from AOCI, current period, tax expense (benefit)	0	0
TOTAL
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(92)	(213)
Other comprehensive income (loss):
Ending balance	$ 231	$ (92)	$ (213)