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Condensed Consolidating Financial Statements (Details 4) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Nov. 30, 2016
Nov. 30, 2016
Nov. 30, 2015
Condensed Financial Statements Captions [Line Items]      
Net Cash Provided by (Used in) Operating Activities, Continuing Operations   $ 2,635 $ 2,454
Investing Activities:      
Capital expenditures   (2,681) (2,562)
Proceeds from asset dispositions and other   100 12
Cash used in investing activities   (2,581) (2,550)
Financing Activities:      
Principal payments on debt   (43) (17)
Proceeds from debt issuance     1,238
Proceeds from stock issuances   164 62
Dividends paid   (213) (141)
Purchases of treasury stock $ (112) (334) (1,101)
Other, net   (5) (8)
Cash (used in) provided by financing activities   (431) 33
Effect of exchange rate changes on cash   (98) (53)
Net decrease in cash and cash equivalents   (475) (116)
Cash and cash equivalents at beginning of period   3,534 3,763
Cash and cash equivalents at end of period 3,059 3,059 3,647
Consolidation Eliminations Member      
Condensed Financial Statements Captions [Line Items]      
Net Cash Provided by (Used in) Operating Activities, Continuing Operations   (12) 34
Financing Activities:      
Net decrease in cash and cash equivalents   (12) 34
Cash and cash equivalents at beginning of period   (43) (78)
Cash and cash equivalents at end of period (55) (55) (44)
Parent Company Member      
Condensed Financial Statements Captions [Line Items]      
Net Cash Provided by (Used in) Operating Activities, Continuing Operations   (376) (847)
Investing Activities:      
Proceeds from asset dispositions and other   84 (5)
Cash used in investing activities   84 (5)
Financing Activities:      
Net transfers from (to) Parent   24 648
Payment on loan between subsidiaries   8  
Proceeds from debt issuance     1,238
Proceeds from stock issuances   164 62
Dividends paid   (213) (141)
Purchases of treasury stock   (334) (1,101)
Other, net   4 (8)
Cash (used in) provided by financing activities   (347) 698
Effect of exchange rate changes on cash   (5)  
Net decrease in cash and cash equivalents   (644) (154)
Cash and cash equivalents at beginning of period   1,974 2,383
Cash and cash equivalents at end of period 1,330 1,330 2,229
Guarantor Subsidiaries Member      
Condensed Financial Statements Captions [Line Items]      
Net Cash Provided by (Used in) Operating Activities, Continuing Operations   2,550 3,054
Investing Activities:      
Capital expenditures   (2,455) (2,482)
Proceeds from asset dispositions and other   13 21
Cash used in investing activities   (2,442) (2,461)
Financing Activities:      
Net transfers from (to) Parent   (94) (691)
Payment on loan between subsidiaries   (15) 106
Intercompany dividends   1 20
Principal payments on debt   (31) (2)
Other, net   (2) (27)
Cash (used in) provided by financing activities   (141) (594)
Effect of exchange rate changes on cash   1 (12)
Net decrease in cash and cash equivalents   (32) (13)
Cash and cash equivalents at beginning of period   326 487
Cash and cash equivalents at end of period 294 294 474
Non Guarantor Subsidiaries Member      
Condensed Financial Statements Captions [Line Items]      
Net Cash Provided by (Used in) Operating Activities, Continuing Operations   473 213
Investing Activities:      
Capital expenditures   (226) (80)
Proceeds from asset dispositions and other   3 (4)
Cash used in investing activities   (223) (84)
Financing Activities:      
Net transfers from (to) Parent   70 43
Payment on loan between subsidiaries   7 (106)
Intercompany dividends   (1) (20)
Principal payments on debt   (12) (15)
Other, net   (7) 27
Cash (used in) provided by financing activities   57 (71)
Effect of exchange rate changes on cash   (94) (41)
Net decrease in cash and cash equivalents   213 17
Cash and cash equivalents at beginning of period   1,277 971
Cash and cash equivalents at end of period $ 1,490 $ 1,490 $ 988