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Supplemental Cash Flow Information (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Nov. 30, 2011	Nov. 30, 2010
Supplemental Cash Flow Information [Abstract]
Interest (net of capitalized interest)	$ 23	$ 45
Income taxes	276	340
Income tax refunds received	(6)	(11)
Cash tax payments, net	$ 270	$ 329

The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income.

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- Definition

The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes.

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- Definition

The amount of cash paid for interest during the period net of cash paid for interest that is capitalized.

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