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Income Taxes (Details 3) - USD ($) $ in Millions | 12 Months Ended
--- | ---
May. 31, 2015 | May. 31, 2014 | May. 31, 2013
Effective Income Tax Rate Continuing Operations Tax Rate Reconciliation [Abstract] |  |  |
Statutory U.S. income tax rate | 35.00% | 35.00% | 35.00%
Effective tax rate | 35.50% | 36.50% | 37.40%
IncomeTax Expense Benefit Continuing Operations Income Tax Reconciliation [Abstract] |  |  |
Taxes computed at federal statutory rate | $ 569 | $ 1,280 | $ 1,518
State and local income taxes, net of federal benefit | 36 | 90 | 117
Foreign operations | (43) | (38) | (21)
Other, net | 15 | 2 | 8
PROVISION FOR INCOME TAXES | $ 577 | $ 1,334 | $ 1,622

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