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INTANGIBLE ASSETS (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
May 31, 2016 | May 31, 2015 | May 31, 2014
Total intangible assets [Line Items] |  |  |  |
Intangible Assets, Gross |  | $ 11,566 | $ 15,047 |
Additions |  | 175 |  |
Retirements |  | (3,656) |  |
Accumulated Amortization |  | (6,623) | (8,641) |
Expense |  | (1,638) | (2,149) | $ (2,300)
Retirements |  | 3,656 |  |
Total intangible assets, net |  | $ 4,943 | 6,406 |
Intangible assets subject to amortization [Member] |  |  |  |
Total intangible assets [Line Items] |  |  |  |
Weighted Average Useful Life (in years) | [1] | 7 years |  |
Intangible assets subject to amortization [Member] | Software support agreements and related relationships [Member] |  |  |  |
Total intangible assets [Line Items] |  |  |  |
Intangible Assets, Gross |  | $ 2,419 | 4,190 |
Retirements |  | (1,771) |  |
Accumulated Amortization |  | (1,287) | (2,700) |
Expense |  | (358) |  |
Retirements |  | 1,771 |  |
Intangible assets subject to amortization |  | 1,132 | 1,490 |
Intangible assets subject to amortization [Member] | Hardware support agreements and related relationships [Member] |  |  |  |
Total intangible assets [Line Items] |  |  |  |
Intangible Assets, Gross |  | 1,010 | 1,012 |
Retirements |  | (2) |  |
Accumulated Amortization |  | (797) | (654) |
Expense |  | (145) |  |
Retirements |  | 2 |  |
Intangible assets subject to amortization |  | 213 | 358 |
Intangible assets subject to amortization [Member] | Developed technology [Member] |  |  |  |
Total intangible assets [Line Items] |  |  |  |
Intangible Assets, Gross |  | 3,661 | 4,602 |
Additions |  | 97 |  |
Retirements |  | (1,038) |  |
Accumulated Amortization |  | (1,876) | (2,355) |
Expense |  | (559) |  |
Retirements |  | 1,038 |  |
Intangible assets subject to amortization |  | $ 1,785 | 2,247 |
Weighted Average Useful Life (in years) | [1] | 5 years |  |
Intangible assets subject to amortization [Member] | Core Technology [Member] |  |  |  |
Total intangible assets [Line Items] |  |  |  |
Intangible Assets, Gross |  | $ 552 | 552 |
Accumulated Amortization |  | (500) | (411) |
Expense |  | (89) |  |
Intangible assets subject to amortization |  | 52 | 141 |
Intangible assets subject to amortization [Member] | Customer relationships and contract backlog [Member] |  |  |  |
Total intangible assets [Line Items] |  |  |  |
Intangible Assets, Gross |  | 1,399 | 2,197 |
Additions |  | 8 |  |
Retirements |  | (806) |  |
Accumulated Amortization |  | (1,121) | (1,710) |
Expense |  | (217) |  |
Retirements |  | 806 |  |
Intangible assets subject to amortization |  | $ 278 | 487 |
Weighted Average Useful Life (in years) | [1] | 3 years |  |
Intangible assets subject to amortization [Member] | SaaS, PaaS and IaaS agreements and related relationships and other [Member] |  |  |  |
Total intangible assets [Line Items] |  |  |  |
Intangible Assets, Gross |  | $ 2,034 | 1,993 |
Additions |  | 57 |  |
Retirements |  | (16) |  |
Accumulated Amortization |  | (704) | (508) |
Expense |  | (212) |  |
Retirements |  | 16 |  |
Intangible assets subject to amortization |  | $ 1,330 | 1,485 |
Weighted Average Useful Life (in years) | [1] | 10 years |  |
Intangible assets subject to amortization [Member] | Trademarks [Member] |  |  |  |
Total intangible assets [Line Items] |  |  |  |
Intangible Assets, Gross |  | $ 491 | 501 |
Additions |  | 13 |  |
Retirements |  | (23) |  |
Accumulated Amortization |  | (338) | (303) |
Expense |  | (58) |  |
Retirements |  | 23 |  |
Intangible assets subject to amortization |  | $ 153 | $ 198 |
Weighted Average Useful Life (in years) | [1] | 5 years |  |
[1] | Represents weighted average useful lives of intangible assets acquired during fiscal 2016

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