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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
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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) |

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