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Retirement Plans - Reconciliation of Changes In Pension And Postretirement Healthcare Plans Benefit Obligations And Fair Value Of Assets (Details) - USD ($)
$ in Millions
 1 Months Ended 3 Months Ended 12 Months Ended
Feb. 28, 2018
Feb. 28, 2018
May 31, 2018
May 31, 2017
May 31, 2016
U.S. Plans [Member]          
Change in Plan Assets          
Company contributions $ 1,500 $ 1,500 $ 2,500 $ 2,000  
Pension Plans [Member]          
Changes in Projected Benefit Obligation (“PBO”) and Accumulated Postretirement Benefit Obligation (“APBO”)          
PBO/APBO at the beginning of year     29,913    
PBO/APBO at the end of year     24,820 29,913  
Change in Plan Assets          
Balance at beginning of year     26,312    
Balance at end of year     23,566 26,312  
Funded Status of the Plans     (1,254) (3,601)  
Pension Plans [Member] | U.S. Plans [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Accumulated Benefit Obligation (“ABO”)     22,029 27,244  
Changes in Projected Benefit Obligation (“PBO”) and Accumulated Postretirement Benefit Obligation (“APBO”)          
PBO/APBO at the beginning of year     27,870 27,804  
Service cost     679 638 $ 622
Interest cost     1,115 1,128 1,155
Actuarial loss     21 571  
Benefits paid     (854) (2,271)  
Settlements     (6,178)    
PBO/APBO at the end of year     22,653 27,870 27,804
Change in Plan Assets          
Balance at beginning of year     24,933 23,017  
Actual return on plan assets     1,609 2,167  
Company contributions     2,547 2,020  
Benefits paid     (854) (2,271)  
Settlements     (6,178)    
Balance at end of year     22,057 24,933 23,017
Funded Status of the Plans     (596) (2,937)  
Amount Recognized in the Balance Sheet at May 31:          
Current pension, postretirement healthcare and other benefit obligations     (22) (33)  
Noncurrent pension, postretirement healthcare and other benefit obligations     (574) (2,904)  
Net amount recognized     (596) (2,937)  
Amounts Recognized in AOCI and not yet reflected in Net Periodic Benefit Cost:          
Prior service (credit) cost and other     (292) (410)  
Defined Benefit Plan Amounts That Will Be Amortized From Accumulated Other Comprehensive Income Loss In Next Fiscal Year Abstract          
Prior service credit and other     (118) (118)  
Pension Plans [Member] | International Plans [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Accumulated Benefit Obligation (“ABO”)     1,956 1,842  
Changes in Projected Benefit Obligation (“PBO”) and Accumulated Postretirement Benefit Obligation (“APBO”)          
PBO/APBO at the beginning of year     2,043 1,798  
Service cost     97 83 40
Interest cost     49 43 25
Actuarial loss     (34) 161  
Benefits paid     (46) (38)  
Settlements     (5) (7)  
Purchase accounting adjustment       26  
Other     63 (23)  
PBO/APBO at the end of year     2,167 2,043 1,798
Change in Plan Assets          
Balance at beginning of year     1,379 1,254  
Actual return on plan assets     49 112  
Company contributions     84 95  
Benefits paid     (46) (38)  
Settlements     (5) (7)  
Other     48 (37)  
Balance at end of year     1,509 1,379 1,254
Funded Status of the Plans     (658) (664)  
Amount Recognized in the Balance Sheet at May 31:          
Noncurrent asset     73 40  
Current pension, postretirement healthcare and other benefit obligations     (16) (17)  
Noncurrent pension, postretirement healthcare and other benefit obligations     (715) (687)  
Net amount recognized     (658) (664)  
Amounts Recognized in AOCI and not yet reflected in Net Periodic Benefit Cost:          
Prior service (credit) cost and other     (10) (13)  
Defined Benefit Plan Amounts That Will Be Amortized From Accumulated Other Comprehensive Income Loss In Next Fiscal Year Abstract          
Prior service credit and other     (2) (2)  
Postretirement Healthcare Plans [Member]          
Changes in Projected Benefit Obligation (“PBO”) and Accumulated Postretirement Benefit Obligation (“APBO”)          
PBO/APBO at the beginning of year     927 905  
Service cost     36 36 40
Interest cost     39 39 42
Actuarial loss     (9) (14)  
Benefits paid     (80) (72)  
Other     42 33  
PBO/APBO at the end of year     955 927 $ 905
Change in Plan Assets          
Company contributions     42 36  
Benefits paid     (80) (72)  
Other     38 36  
Funded Status of the Plans     (955) (927)  
Amount Recognized in the Balance Sheet at May 31:          
Current pension, postretirement healthcare and other benefit obligations     (62) (39)  
Noncurrent pension, postretirement healthcare and other benefit obligations     (893) (888)  
Net amount recognized     (955) (927)  
Amounts Recognized in AOCI and not yet reflected in Net Periodic Benefit Cost:          
Prior service (credit) cost and other     $ 2 $ (4)