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Condensed Consolidating Statements of Cash Flows (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Feb. 28, 2017
Feb. 28, 2017
Feb. 29, 2016
Condensed Financial Statements Captions [Line Items]      
Net Cash Provided by (Used in) Operating Activities, Continuing Operations   $ 2,645 $ 3,796
Investing Activities:      
Capital expenditures   (3,790) (3,562)
Proceeds from asset dispositions and other   123 (17)
Cash used in investing activities   (3,667) (3,579)
Financing Activities:      
Principal payments on debt   (49) (28)
Proceeds from debt issuance   1,190 1,238
Proceeds from stock issuances   265 79
Dividends paid   (319) (210)
Purchase of treasury stock $ (24) (358) (2,133)
Other, net   2 (7)
Cash provided by (used in) financing activities   731 (1,061)
Effect of exchange rate changes on cash   (70) (78)
Net decrease in cash and cash equivalents   (361) (922)
Cash and cash equivalents at beginning of period   3,534 3,763
Cash and cash equivalents at end of period 3,173 3,173 2,841
Consolidation Eliminations Member      
Condensed Financial Statements Captions [Line Items]      
Net Cash Provided by (Used in) Operating Activities, Continuing Operations   (2) 46
Financing Activities:      
Net decrease in cash and cash equivalents   (2) 46
Cash and cash equivalents at beginning of period   (43) (78)
Cash and cash equivalents at end of period (45) (45) (32)
Parent Company Member      
Condensed Financial Statements Captions [Line Items]      
Net Cash Provided by (Used in) Operating Activities, Continuing Operations   (1,497) (833)
Investing Activities:      
Proceeds from asset dispositions and other   85 (55)
Cash used in investing activities   85 (55)
Financing Activities:      
Net transfers from (to) Parent   117 1,036
Payment on loan between subsidiaries   36  
Proceeds from debt issuance   1,190 1,238
Proceeds from stock issuances   265 79
Dividends paid   (319) (210)
Purchase of treasury stock   (358) (2,133)
Other, net   (8) (7)
Cash provided by (used in) financing activities   923 3
Effect of exchange rate changes on cash   (10)  
Net decrease in cash and cash equivalents   (499) (885)
Cash and cash equivalents at beginning of period   1,974 2,383
Cash and cash equivalents at end of period 1,475 1,475 1,498
Guarantor Subsidiaries Member      
Condensed Financial Statements Captions [Line Items]      
Net Cash Provided by (Used in) Operating Activities, Continuing Operations   3,615 4,213
Investing Activities:      
Capital expenditures   (3,456) (3,434)
Proceeds from asset dispositions and other   16 26
Cash used in investing activities   (3,440) (3,408)
Financing Activities:      
Net transfers from (to) Parent   (148) (1,039)
Payment on loan between subsidiaries   (15) 109
Intercompany dividends   1 20
Principal payments on debt   (33) (7)
Other, net   (12) (27)
Cash provided by (used in) financing activities   (207) (944)
Effect of exchange rate changes on cash   7 (17)
Net decrease in cash and cash equivalents   (25) (156)
Cash and cash equivalents at beginning of period   326 487
Cash and cash equivalents at end of period 301 301 331
Non Guarantor Subsidiaries Member      
Condensed Financial Statements Captions [Line Items]      
Net Cash Provided by (Used in) Operating Activities, Continuing Operations   529 370
Investing Activities:      
Capital expenditures   (334) (128)
Proceeds from asset dispositions and other   22 12
Cash used in investing activities   (312) (116)
Financing Activities:      
Net transfers from (to) Parent   31 3
Payment on loan between subsidiaries   (21) (109)
Intercompany dividends   (1) (20)
Principal payments on debt   (16) (21)
Other, net   22 27
Cash provided by (used in) financing activities   15 (120)
Effect of exchange rate changes on cash   (67) (61)
Net decrease in cash and cash equivalents   165 73
Cash and cash equivalents at beginning of period   1,277 971
Cash and cash equivalents at end of period $ 1,442 $ 1,442 $ 1,044