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ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended |
--- | --- | ---
May 31, 2019 | May 31, 2018 | May 31, 2017 | May 31, 2016
Condensed Consolidated Statement of Operations [Abstract] |  |  |  |
Total revenues | $ 39,506 | $ 39,383 | $ 37,792 |
Total operating expenses | 25,971 | 26,119 | 24,879 |
Non-operating income, net | 815 | 1,185 | 565 |
Provision for income taxes | 1,185 | 8,837 | 2,228 |
Net income | $ 11,083 | $ 3,587 | $ 9,452 |
Basic earnings per share | $ 3.05 | $ 0.87 | $ 2.30 |
Diluted earnings per share | $ 2.97 | $ 0.85 | $ 2.24 |
Condensed Consolidated Balance Sheet [Abstract] |  |  |  |
Trade receivables, net of allowances for doubtful accounts | $ 5,134 | $ 5,136 |  |
Prepaid expenses and other current assets | 3,425 | 3,762 |  |
Deferred tax assets | 2,696 | 1,395 |  |
Other non-current assets | 4,317 | 3,975 |  |
Total current liabilities | 18,630 | 19,124 |  |
Total non-current liabilities | 67,716 | 71,854 |  |
Total equity | 22,363 | 46,873 | $ 55,130 | $ 47,790
Acquisition Related and Other Expenses [Abstract] |  |  |  |
Transitional and other employee related costs | 49 | 48 | 41 |
Stock-based compensation | 0 | 1 | 35 |
Professional fees and other, net | 16 | 3 | 33 |
Business combination adjustments, net | (21) | 0 | (6) |
Total acquisition related and other expenses | 44 | 52 | 103 |
Non-Operating Income, net [Abstract] |  |  |  |
Interest income | 1,092 | 1,203 | 804 |
Foreign currency losses, net | (111) | (74) | (152) |
Noncontrolling interests in income | (152) | (135) | (118) |
Other income, net | (14) | 191 | 31 |
Total non-operating income, net | $ 815 | 1,185 | 565 |
Adoption of Topic 606 and ASU 2017-07 [Member] |  |  |  |
Condensed Consolidated Statement of Operations [Abstract] |  |  |  |
Total revenues |  | 39,383 | 37,792 |
Total operating expenses |  | 26,119 | 24,879 |
Non-operating income, net |  | 1,185 | 565 |
Provision for income taxes |  | 8,837 | 2,228 |
Net income |  | $ 3,587 | $ 9,452 |
Basic earnings per share |  | $ 0.87 | $ 2.30 |
Diluted earnings per share |  | $ 0.85 | $ 2.24 |
Condensed Consolidated Balance Sheet [Abstract] |  |  |  |
Trade receivables, net of allowances for doubtful accounts |  | $ 5,136 |  |
Prepaid expenses and other current assets |  | 3,762 |  |
Deferred tax assets |  | 1,395 |  |
Other non-current assets |  | 3,975 |  |
Total current liabilities |  | 19,124 |  |
Total non-current liabilities |  | 71,854 |  |
Total equity |  | 46,873 |  |
Non-Operating Income, net [Abstract] |  |  |  |
Total non-operating income, net |  | 1,185 | $ 565 |
Adoption of Topic 606 and ASU 2017-07 [Member] | As Previously Reported [Member] |  |  |  |
Condensed Consolidated Statement of Operations [Abstract] |  |  |  |
Total revenues |  | 39,831 | 37,728 |
Total operating expenses |  | 26,152 | 25,018 |
Non-operating income, net |  | 1,237 | 605 |
Provision for income taxes |  | 9,066 | 2,182 |
Net income |  | $ 3,825 | $ 9,335 |
Basic earnings per share |  | $ 0.93 | $ 2.27 |
Diluted earnings per share |  | $ 0.90 | $ 2.21 |
Condensed Consolidated Balance Sheet [Abstract] |  |  |  |
Trade receivables, net of allowances for doubtful accounts |  | $ 5,279 |  |
Prepaid expenses and other current assets |  | 3,424 |  |
Deferred tax assets |  | 1,491 |  |
Other non-current assets |  | 3,487 |  |
Total current liabilities |  | 19,195 |  |
Total non-current liabilities |  | 71,845 |  |
Total equity |  | 46,224 |  |
Non-Operating Income, net [Abstract] |  |  |  |
Total non-operating income, net |  | 1,237 | $ 605 |
Adoption of Topic 606 and ASU 2017-07 [Member] | Adjustments [Member] |  |  |  |
Condensed Consolidated Statement of Operations [Abstract] |  |  |  |
Total revenues |  | (448) | 64 |
Total operating expenses |  | (33) | (139) |
Non-operating income, net |  | (52) | (40) |
Provision for income taxes |  | (229) | 46 |
Net income |  | $ (238) | $ 117 |
Basic earnings per share |  | $ (0.06) | $ 0.03 |
Diluted earnings per share |  | $ (0.05) | $ 0.03 |
Condensed Consolidated Balance Sheet [Abstract] |  |  |  |
Trade receivables, net of allowances for doubtful accounts |  | $ (143) |  |
Prepaid expenses and other current assets |  | 338 |  |
Deferred tax assets |  | (96) |  |
Other non-current assets |  | 488 |  |
Total current liabilities |  | (71) |  |
Total non-current liabilities |  | 9 |  |
Total equity |  | 649 |  |
Non-Operating Income, net [Abstract] |  |  |  |
Total non-operating income, net |  | $ (52) | $ (40) |

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