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Accumulated Other Comprehensive Income - Changes in AOCI (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
May 31, 2018 | May 31, 2017 | May 31, 2016
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Beginning balance | $ 12,407 | $ 12,258 | $ 12,707
Other comprehensive income (loss): |  |  |
Other comprehensive gains (losses) before reclassifications, net of tax | (56) | 119 |
Reclassifications to net income of previously deferred (gains) losses, net of tax | 160 | (650) |
Total other comprehensive income (loss), net of tax | 104 | (531) | (928)
Reclassifications to retained earnings in accordance with ASU 2018-02(4) | 17 |  |
Ending balance | 9,812 | 12,407 | 12,258
Other comprehensive income, before reclassification, tax benefit (expense) | (31) | 27 |
Reclassification from AOCI, current period, tax expense (benefit) | (3) | (6) |
Foreign Currency Translation Adjustment |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Beginning balance | (191) | (207) |
Other comprehensive income (loss): |  |  |
Other comprehensive gains (losses) before reclassifications, net of tax | (6) | 15 |
Reclassifications to net income of previously deferred (gains) losses, net of tax | 0 | 1 |
Total other comprehensive income (loss), net of tax | (6) | 16 |
Reclassifications to retained earnings in accordance with ASU 2018-02(4) | 24 |  |
Ending balance | (173) | (191) | (207)
Other comprehensive income, before reclassification, tax benefit (expense) | (24) | 0 |
Reclassification from AOCI, current period, tax expense (benefit) | 0 | 0 |
Cash Flow Hedges |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Beginning balance | (52) | 463 |
Other comprehensive income (loss): |  |  |
Other comprehensive gains (losses) before reclassifications, net of tax | (52) | 118 |
Reclassifications to net income of previously deferred (gains) losses, net of tax | 128 | (633) |
Total other comprehensive income (loss), net of tax | 76 | (515) |
Reclassifications to retained earnings in accordance with ASU 2018-02(4) | (7) |  |
Ending balance | 17 | (52) | 463
Other comprehensive income, before reclassification, tax benefit (expense) | (3) | 24 |
Reclassification from AOCI, current period, tax expense (benefit) | (3) | (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(4) | 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 | (85) | (53) |
Other comprehensive income (loss): |  |  |
Other comprehensive gains (losses) before reclassifications, net of tax | 2 | (14) |
Reclassifications to net income of previously deferred (gains) losses, net of tax | 32 | (18) |
Total other comprehensive income (loss), net of tax | 34 | (32) |
Reclassifications to retained earnings in accordance with ASU 2018-02(4) | 0 |  |
Ending balance | (51) | (85) | (53)
Other comprehensive income, before reclassification, tax benefit (expense) | (4) | 3 |
Reclassification from AOCI, current period, tax expense (benefit) | 0 | (3) |
Total |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Beginning balance | (213) | 318 |
Other comprehensive income (loss): |  |  |
Ending balance | $ (92) | $ (213) | $ 318

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- Definition Amount of increase (decrease) in accumulated other comprehensive income (AOCI) for reclassification to retained earnings of tax effect from remeasurement of deferred tax pursuant to Tax Cuts and Jobs Act. + References No definition available. + Details
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- Definition Amount after tax, before reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=84158357&loc=d3e1436-108581 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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