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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, 2024 | May 31, 2023 | May 31, 2022
U.S. Plans [Member] |  |  |
Change in Plan Assets |  |  |
Company contributions | $ 800 | $ 800 |
Pension Plans [Member] |  |  |
Changes in PBO and Accumulated Postretirement Benefit Obligation (“APBO”) |  |  |
PBO/APBO at the beginning of year | 27,416 |  |
PBO/APBO at the end of year | 27,302 | 27,416 |
Change in Plan Assets |  |  |
Balance at beginning of year | 25,405 |  |
Balance at end of year | 26,399 | 25,405 |
Funded Status of the Plans | (903) | (2,011) |
Pension Plans [Member] | U.S. Plans [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Accumulated Benefit Obligation (“ABO”) | 25,756 | 25,825 |
Changes in PBO and Accumulated Postretirement Benefit Obligation (“APBO”) |  |  |
PBO/APBO at the beginning of year | 26,426 | 28,702 |
Service cost | 544 | 651 | $ 835
Interest cost | 1,362 | 1,218 | 1,020
Actuarial (gain) loss | (514) | (2,882) |
Benefits paid | (1,534) | (1,263) |
PBO/APBO at the end of year | 26,284 | 26,426 | 28,702
Change in Plan Assets |  |  |
Balance at beginning of year | 24,826 | 25,970 |
Actual return on plan assets | 1,674 | (707) |
Company contributions | 831 | 826 |
Benefits paid | (1,534) | (1,263) |
Balance at end of year | 25,797 | 24,826 | 25,970
Funded Status of the Plans | (487) | (1,600) |
Amount Recognized in the Balance Sheet at May 31: |  |  |
Current pension, and other benefit obligations | (35) | (39) |
Noncurrent pension, and other benefit obligations | (452) | (1,561) |
Net amount recognized | (487) | (1,600) |
Amounts Recognized in AOCL and not yet reflected in Net Periodic Benefit Cost: |  |  |
Prior service cost (credit) | (39) | (47) |
Pension Plans [Member] | International Pension Plans [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Accumulated Benefit Obligation (“ABO”) | 885 | 848 |
Changes in PBO and Accumulated Postretirement Benefit Obligation (“APBO”) |  |  |
PBO/APBO at the beginning of year | 990 | 1,096 |
Service cost | 38 | 44 | 56
Interest cost | 42 | 34 | 32
Actuarial (gain) loss | 3 | (121) |
Benefits paid | (39) | (35) |
Settlements | (11) | (20) |
Other | (5) | (8) |
PBO/APBO at the end of year | 1,018 | 990 | 1,096
Change in Plan Assets |  |  |
Balance at beginning of year | 579 | 663 |
Actual return on plan assets | 12 | (83) |
Company contributions | 50 | 55 |
Benefits paid | (39) | (35) |
Settlements | (11) | (20) |
Other | 11 | (1) |
Balance at end of year | 602 | 579 | 663
Funded Status of the Plans | (416) | (411) |
Amount Recognized in the Balance Sheet at May 31: |  |  |
Noncurrent asset | 73 | 88 |
Current pension, and other benefit obligations | (22) | (23) |
Noncurrent pension, and other benefit obligations | (467) | (476) |
Net amount recognized | (416) | (411) |
Amounts Recognized in AOCL and not yet reflected in Net Periodic Benefit Cost: |  |  |
Prior service cost (credit) | 3 | 4 |
Postretirement Healthcare Plans [Member] |  |  |
Changes in PBO and Accumulated Postretirement Benefit Obligation (“APBO”) |  |  |
PBO/APBO at the beginning of year | 1,169 | 1,286 |
Service cost | 27 | 37 | 48
Interest cost | 61 | 55 | 41
Actuarial (gain) loss | 18 | (138) |
Benefits paid | (89) | (107) |
Other | (24) | 36 |
PBO/APBO at the end of year | 1,162 | 1,169 | $ 1,286
Change in Plan Assets |  |  |
Company contributions | 67 | 71 |
Benefits paid | (89) | (107) |
Other | 22 | 36 |
Funded Status of the Plans | (1,162) | (1,169) |
Amount Recognized in the Balance Sheet at May 31: |  |  |
Current pension, and other benefit obligations | (81) | (84) |
Noncurrent pension, and other benefit obligations | (1,081) | (1,085) |
Net amount recognized | (1,162) | $ (1,169) |
Amounts Recognized in AOCL and not yet reflected in Net Periodic Benefit Cost: |  |  |
Prior service cost (credit) | $ (43) |  |

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