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Condensed Consolidating Financial Statements (Details 4) (USD $)
In Millions
3 Months Ended
Aug. 31, 2011
Aug. 31, 2010
Condensed Financial Statements Captions [Line Items]    
Cash provided by operating activities $ 860 $ 796
Investing Activities:    
Capital expenditures (1,110) (1,012)
Business acquisition, net of cash acquired (111)  
Proceeds from asset dispositions and other 5 3
Cash used in investing activities (1,216) (1,009)
Financing Activities:    
Principal payments on debt (17) (12)
Proceeds from stock issuances 28 8
Excess tax benefit on the exercise of stock options 4 1
Dividends paid (41) (38)
Cash used in financing activities (26) (41)
Effect of exchange rate changes on cash 13 11
Net decrease in cash and cash equivalents (369) (243)
Cash and cash equivalents at beginning of period 2,328 1,952
Cash and cash equivalents at end of period 1,959 1,709
Parent Company Member
   
Condensed Financial Statements Captions [Line Items]    
Cash provided by operating activities 70 19
Investing Activities:    
Capital expenditures (1)  
Cash used in investing activities (1)  
Financing Activities:    
Net transfers from (to) Parent (335) (193)
Proceeds from stock issuances 28 8
Excess tax benefit on the exercise of stock options 4 1
Dividends paid (41) (38)
Cash used in financing activities (344) (222)
Net decrease in cash and cash equivalents (275) (203)
Cash and cash equivalents at beginning of period 1,589 1,310
Cash and cash equivalents at end of period 1,314 1,107
Guarantor Subsidiaries Member
   
Condensed Financial Statements Captions [Line Items]    
Cash provided by operating activities 758 701
Investing Activities:    
Capital expenditures (1,095) (978)
Proceeds from asset dispositions and other 5 2
Cash used in investing activities (1,090) (976)
Financing Activities:    
Net transfers from (to) Parent 356 211
Payment on loan between subsidiaries (15) 40
Intercompany dividends   4
Principal payments on debt (17) (12)
Other, net (15)  
Cash used in financing activities 309 243
Effect of exchange rate changes on cash 5 8
Net decrease in cash and cash equivalents (18) (24)
Cash and cash equivalents at beginning of period 279 258
Cash and cash equivalents at end of period 261 234
Non Guarantor Subsidiaries Member
   
Condensed Financial Statements Captions [Line Items]    
Cash provided by operating activities 115 78
Investing Activities:    
Capital expenditures (14) (34)
Business acquisition, net of cash acquired (111)  
Proceeds from asset dispositions and other   1
Cash used in investing activities (125) (33)
Financing Activities:    
Net transfers from (to) Parent (21) (18)
Payment on loan between subsidiaries 15 (40)
Intercompany dividends   (4)
Other, net 15  
Cash used in financing activities 9 (62)
Effect of exchange rate changes on cash 8 3
Net decrease in cash and cash equivalents 7 (14)
Cash and cash equivalents at beginning of period 546 443
Cash and cash equivalents at end of period 553 429
Consolidation Eliminations Member
   
Condensed Financial Statements Captions [Line Items]    
Cash provided by operating activities (83) (2)
Financing Activities:    
Net decrease in cash and cash equivalents (83) (2)
Cash and cash equivalents at beginning of period (86) (59)
Cash and cash equivalents at end of period $ (169) $ (61)