Discontinued Operations - Summarized Results (Details) - USD ($) $ in Millions	12 Months Ended
May. 31, 2015	May. 31, 2014	May. 31, 2013
Discontinued Operations and Disposal Groups [Abstract]
Revenues	$ 0	$ 0	$ 523
Income before income taxes	0	0	108
Income tax expense	0	0	87
NET INCOME FROM DISCONTINUED OPERATIONS	$ 0	$ 0	$ 21

Amount before tax of income (loss) from a discontinued operation. Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal.

Amount after tax of income (loss) from a discontinued operation including the portion attributable to the noncontrolling interest. Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal.

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