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Condensed Consolidating Financial Statements (Details 4) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Nov. 30, 2015
Nov. 30, 2015
Nov. 30, 2014
Condensed Financial Statements Captions [Line Items]      
Cash provided by (used in) operating activities   $ 2,454 $ 2,151
Investing Activities:      
Capital expenditures   (2,562) (1,890)
Proceeds from asset dispositions and other   12 7
Cash used in investing activities   (2,550) (1,883)
Financing Activities:      
Principal payments on debt   (17) (1)
Proceeds from debt issuances   1,238  
Proceeds from stock issuances   62 189
Excess tax benefit on the exercise of stock options   8 23
Dividends paid   (141) (114)
Purchase of treasury stock $ (911) (1,101) (947)
Other, net   (16)  
Cash provided by (used in) financing activities   33 (850)
Effect of exchange rate changes on cash   (53) (60)
Net decrease in cash and cash equivalents   (116) (642)
Cash and cash equivalents at beginning of period   3,763 2,908
Cash and cash equivalents at end of period 3,647 3,647 2,266
Parent Company Member      
Condensed Financial Statements Captions [Line Items]      
Cash provided by (used in) operating activities   (847) (458)
Investing Activities:      
Capital expenditures     (1)
Proceeds from asset dispositions and other   (5) (1)
Cash used in investing activities   (5) (2)
Financing Activities:      
Net transfers from (to) Parent   648 601
Proceeds from debt issuances   1,238  
Proceeds from stock issuances   62 189
Excess tax benefit on the exercise of stock options   8 23
Dividends paid   (141) (114)
Purchase of treasury stock   (1,101) (947)
Other, net   (16)  
Cash provided by (used in) financing activities   698 (248)
Net decrease in cash and cash equivalents   (154) (708)
Cash and cash equivalents at beginning of period   2,383 1,756
Cash and cash equivalents at end of period 2,229 2,229 1,048
Guarantor Subsidiaries Member      
Condensed Financial Statements Captions [Line Items]      
Cash provided by (used in) operating activities   3,054 2,335
Investing Activities:      
Capital expenditures   (2,482) (1,809)
Proceeds from asset dispositions and other   21 17
Cash used in investing activities   (2,461) (1,792)
Financing Activities:      
Net transfers from (to) Parent   (691) (610)
Payment on loan between subsidiaries   106 143
Intercompany dividends   20 22
Principal payments on debt   (2) (1)
Other, net   (27) (39)
Cash provided by (used in) financing activities   (594) (485)
Effect of exchange rate changes on cash   (12) (17)
Net decrease in cash and cash equivalents   (13) 41
Cash and cash equivalents at beginning of period   487 441
Cash and cash equivalents at end of period 474 474 482
Non Guarantor Subsidiaries Member      
Condensed Financial Statements Captions [Line Items]      
Cash provided by (used in) operating activities   213 257
Investing Activities:      
Capital expenditures   (80) (80)
Proceeds from asset dispositions and other   (4) (9)
Cash used in investing activities   (84) (89)
Financing Activities:      
Net transfers from (to) Parent   43 9
Payment on loan between subsidiaries   (106) (143)
Intercompany dividends   (20) (22)
Principal payments on debt   (15)  
Other, net   27 39
Cash provided by (used in) financing activities   (71) (117)
Effect of exchange rate changes on cash   (41) (43)
Net decrease in cash and cash equivalents   17 8
Cash and cash equivalents at beginning of period   971 861
Cash and cash equivalents at end of period 988 988 869
Consolidation Eliminations Member      
Condensed Financial Statements Captions [Line Items]      
Cash provided by (used in) operating activities   34 17
Financing Activities:      
Net decrease in cash and cash equivalents   34 17
Cash and cash equivalents at beginning of period   (78) (150)
Cash and cash equivalents at end of period $ (44) $ (44) $ (133)