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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
 12 Months Ended
May 31, 2023
May 31, 2022
May 31, 2021
Pension Plans [Member]      
Changes in PBO and Accumulated Postretirement Benefit Obligation (“APBO”)      
PBO/APBO at the beginning of year $ 29,798    
PBO/APBO at the end of year 27,416 $ 29,798  
Change in Plan Assets      
Balance at beginning of year 26,633    
Balance at end of year 25,405 26,633  
Funded Status of the Plans (2,011) (3,165)  
Pension Plans [Member] | U.S. Plans [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Accumulated Benefit Obligation (“ABO”) 25,825 27,916  
Changes in PBO and Accumulated Postretirement Benefit Obligation (“APBO”)      
PBO/APBO at the beginning of year 28,702 31,423  
Service cost 651 835 $ 851
Interest cost 1,218 1,020 959
Actuarial (gain) loss (2,882) (3,356)  
Benefits paid (1,263) (1,180)  
Other   (40)  
PBO/APBO at the end of year 26,426 28,702 31,423
Change in Plan Assets      
Balance at beginning of year 25,970 29,785  
Actual return on plan assets (707) (3,168)  
Company contributions 826 533  
Benefits paid (1,263) (1,180)  
Balance at end of year 24,826 25,970 29,785
Funded Status of the Plans (1,600) (2,732)  
Amount Recognized in the Balance Sheet at May 31:      
Current pension, postretirement healthcare and other benefit obligations (39) (20)  
Noncurrent pension, postretirement healthcare and other benefit obligations (1,561) (2,712)  
Net amount recognized (1,600) (2,732)  
Amounts Recognized in AOCI and not yet reflected in Net Periodic Benefit Cost:      
Prior service (credit) cost and other (47) (54)  
Pension Plans [Member] | International Pension Plans [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Accumulated Benefit Obligation (“ABO”) 848 946  
Changes in PBO and Accumulated Postretirement Benefit Obligation (“APBO”)      
PBO/APBO at the beginning of year 1,096 2,611  
Service cost 44 56 83
Interest cost 34 32 43
Actuarial (gain) loss (121) (19)  
Benefits paid (35) (36)  
Settlements (20) (1,315)  
Other (8) (233)  
PBO/APBO at the end of year 990 1,096 2,611
Change in Plan Assets      
Balance at beginning of year 663 2,133  
Actual return on plan assets (83) (4)  
Company contributions 55 135  
Benefits paid (35) (36)  
Settlements (20) (1,395)  
Other (1) (170)  
Balance at end of year 579 663 2,133
Funded Status of the Plans (411) (433)  
Amount Recognized in the Balance Sheet at May 31:      
Noncurrent asset 88 126  
Current pension, postretirement healthcare and other benefit obligations (23) (19)  
Noncurrent pension, postretirement healthcare and other benefit obligations (476) (540)  
Net amount recognized (411) (433)  
Amounts Recognized in AOCI and not yet reflected in Net Periodic Benefit Cost:      
Prior service (credit) cost and other 4 (3)  
Postretirement Healthcare Plans [Member]      
Changes in PBO and Accumulated Postretirement Benefit Obligation (“APBO”)      
PBO/APBO at the beginning of year 1,286 1,456  
Service cost 37 48 44
Interest cost 55 41 39
Actuarial (gain) loss (138) (192)  
Benefits paid (107) (113)  
Other 36 46  
PBO/APBO at the end of year 1,169 1,286 $ 1,456
Change in Plan Assets      
Company contributions 71 68  
Benefits paid (107) (113)  
Other 36 45  
Funded Status of the Plans (1,169) (1,286)  
Amount Recognized in the Balance Sheet at May 31:      
Current pension, postretirement healthcare and other benefit obligations (84) (95)  
Noncurrent pension, postretirement healthcare and other benefit obligations (1,085) (1,191)  
Net amount recognized $ (1,169) $ (1,286)