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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, 2020 | May 31, 2019 | May 31, 2018
U.S. Plans [Member] |  |  |
Changes in PBO and Accumulated Postretirement Benefit Obligation (“APBO”) |  |  |
Service cost | $ 768 |  |
Interest cost | 1,000 |  |
Change in Plan Assets |  |  |
Company contributions | 1,000 | $ 1,000 |
Pension Plans [Member] |  |  |
Changes in PBO and Accumulated Postretirement Benefit Obligation (“APBO”) |  |  |
PBO/APBO at the beginning of year | 28,855 |  |
PBO/APBO at the end of year | 32,441 | 28,855 |
Change in Plan Assets |  |  |
Balance at beginning of year | 24,898 |  |
Balance at end of year | 28,691 | 24,898 |
Funded Status of the Plans | (3,750) | (3,957) |
Pension Plans [Member] | U.S. Plans [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Accumulated Benefit Obligation (“ABO”) | 29,272 | 25,915 |
Changes in PBO and Accumulated Postretirement Benefit Obligation (“APBO”) |  |  |
PBO/APBO at the beginning of year | 26,554 | 22,653 |
Service cost | 768 | 689 | $ 679
Interest cost | 1,000 | 951 | 1,115
Actuarial loss (gain) | 2,817 | 3,016 |
Benefits paid | (940) | (755) |
PBO/APBO at the end of year | 30,199 | 26,554 | 22,653
Change in Plan Assets |  |  |
Balance at beginning of year | 23,320 | 22,057 |
Actual return on plan assets | 3,530 | 984 |
Company contributions | 1,068 | 1,034 |
Benefits paid | (940) | (755) |
Balance at end of year | 26,978 | 23,320 | 22,057
Funded Status of the Plans | (3,221) | (3,234) |
Amount Recognized in the Balance Sheet at May 31: |  |  |
Current pension, postretirement healthcare and other benefit obligations | (38) | (70) |
Noncurrent pension, postretirement healthcare and other benefit obligations | (3,183) | (3,164) |
Net amount recognized | (3,221) | (3,234) |
Amounts Recognized in AOCI and not yet reflected in Net Periodic Benefit Cost: |  |  |
Prior service (credit) cost and other | (68) | (173) |
Pension Plans [Member] | International Pension Plans [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Accumulated Benefit Obligation (“ABO”) | 2,012 | 2,084 |
Changes in PBO and Accumulated Postretirement Benefit Obligation (“APBO”) |  |  |
PBO/APBO at the beginning of year | 2,301 | 2,167 |
Service cost | 96 | 94 | 97
Interest cost | 43 | 49 | 49
Actuarial loss (gain) | (87) | 127 |
Benefits paid | (41) | (38) |
Settlements | (6) | (13) |
Other | (64) | (85) |
PBO/APBO at the end of year | 2,242 | 2,301 | 2,167
Change in Plan Assets |  |  |
Balance at beginning of year | 1,578 | 1,509 |
Actual return on plan assets | 146 | 94 |
Company contributions | 86 | 91 |
Benefits paid | (41) | (38) |
Settlements | (6) | (13) |
Other | (50) | (65) |
Balance at end of year | 1,713 | 1,578 | 1,509
Funded Status of the Plans | (529) | (723) |
Amount Recognized in the Balance Sheet at May 31: |  |  |
Noncurrent asset | 142 | 82 |
Current pension, postretirement healthcare and other benefit obligations | (17) | (16) |
Noncurrent pension, postretirement healthcare and other benefit obligations | (654) | (789) |
Net amount recognized | (529) | (723) |
Amounts Recognized in AOCI and not yet reflected in Net Periodic Benefit Cost: |  |  |
Prior service (credit) cost and other | (7) | (6) |
Postretirement Healthcare Plans [Member] |  |  |
Changes in PBO and Accumulated Postretirement Benefit Obligation (“APBO”) |  |  |
PBO/APBO at the beginning of year | 1,221 | 955 |
Service cost | 42 | 35 | 36
Interest cost | 44 | 40 | 39
Actuarial loss (gain) | 85 | 266 |
Benefits paid | (127) | (123) |
Other | 49 | 48 |
PBO/APBO at the end of year | 1,314 | 1,221 | $ 955
Change in Plan Assets |  |  |
Company contributions | 77 | 73 |
Benefits paid | (127) | (123) |
Other | 50 | 50 |
Funded Status of the Plans | (1,314) | (1,221) |
Amount Recognized in the Balance Sheet at May 31: |  |  |
Current pension, postretirement healthcare and other benefit obligations | (104) | (87) |
Noncurrent pension, postretirement healthcare and other benefit obligations | (1,210) | (1,134) |
Net amount recognized | (1,314) | (1,221) |
Amounts Recognized in AOCI and not yet reflected in Net Periodic Benefit Cost: |  |  |
Prior service (credit) cost and other | $ 1 | $ 1 |

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