Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Feb. 29, 2016	May. 31, 2015
CURRENT ASSETS
Allowances for receivables	$ 79	$ 92
Allowances for spare parts, supplies and fuel	$ 209	$ 204
COMMON STOCKHOLDERS' INVESTMENT
Common stock, par value	$ 0.10	$ 0.10
Common stock, shares authorized	1,000	1,000
Common stock, shares issued	1,000	1,000
Common Stock, Shares, Outstanding	1,000	1,000