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Long-term Debt and Other Financing Arrangements - Components of Long-term Debt (Net of Discounts and Debt Issuance Costs) (Details) - USD ($) $ in Millions | May 31, 2021 | May 31, 2020
--- | --- | ---
Debt Instrument [Line Items] |  |
Long Term Debt | $ 19,422 | $ 21,518
Finance lease obligations | 525 | 485
Total Debt and Finance Lease Obligations | 20,879 | 22,003
Less current portion | 146 | 51
LONG-TERM DEBT, LESS CURRENT PORTION | 20,733 | 21,952
Senior Secured Debt Due 2034 1.875% [Member] |  |
Debt Instrument [Line Items] |  |
Long Term Debt | 932 |
Senior Unsecured Debt Due 2022 3.40% [Member] |  |
Debt Instrument [Line Items] |  |
Long Term Debt |  | 498
Senior Unsecured Debt Due 2023 2.625-2.70% [Member] |  |
Debt Instrument [Line Items] |  |
Long Term Debt |  | 748
Senior Unsecured Debt Due 2024 4.00% [Member] |  |
Debt Instrument [Line Items] |  |
Long Term Debt |  | 747
Senior Unsecured Debt Due 2025 3.20-3.80% [Member] |  |
Debt Instrument [Line Items] |  |
Long Term Debt |  | 1,687
Senior Unsecured Debt Due 2026 3.25% [Member] |  |
Debt Instrument [Line Items] |  |
Long Term Debt | 746 | 745
Senior Unsecured Debt Due 2027 3.30% [Member] |  |
Debt Instrument [Line Items] |  |
Long Term Debt |  | 446
Senior Unsecured Debt Due 2028 3.40% [Member] |  |
Debt Instrument [Line Items] |  |
Long Term Debt | 496 | 496
Senior Unsecured Debt Due 2029 4.20% [Member] |  |
Debt Instrument [Line Items] |  |
Long Term Debt | 397 | 397
Senior Unsecured Debt Due 2030 3.10-4.25% [Member] |  |
Debt Instrument [Line Items] |  |
Long Term Debt | 1,733 | 1,732
Senior Unsecured Debt Due 2031 2.40% [Member] |  |
Debt Instrument [Line Items] |  |
Long Term Debt | 989 |
Senior Unsecured Debt Due 2034 4.90% [Member] |  |
Debt Instrument [Line Items] |  |
Long Term Debt | 496 | 495
Senior Unsecured Debt Due 2035 3.90% [Member] |  |
Debt Instrument [Line Items] |  |
Long Term Debt | 494 | 494
Senior Unsecured Debt Due 2041 3.25% [Member] |  |
Debt Instrument [Line Items] |  |
Long Term Debt | 739 |
Senior Unsecured Debt Due 2043 3.875-4.10% [Member] |  |
Debt Instrument [Line Items] |  |
Long Term Debt | 985 | 984
Senior Unsecured Debt Due 2044 5.10% [Member] |  |
Debt Instrument [Line Items] |  |
Long Term Debt | 742 | 742
Senior Unsecured Debt Due 2045 4.10% [Member] |  |
Debt Instrument [Line Items] |  |
Long Term Debt | 641 | 641
Senior Unsecured Debt Due 2046 4.55-4.75% [Member] |  |
Debt Instrument [Line Items] |  |
Long Term Debt | 2,461 | 2,461
Senior Unsecured Debt Due 2047 4.40% [Member] |  |
Debt Instrument [Line Items] |  |
Long Term Debt | 736 | 735
Senior Unsecured Debt Due 2048 4.05% [Member] |  |
Debt Instrument [Line Items] |  |
Long Term Debt | 986 | 986
Senior Unsecured Debt Due 2049 4.95% [Member] |  |
Debt Instrument [Line Items] |  |
Long Term Debt | 836 | 835
Senior Unsecured Debt Due 2050 5.25% [Member] |  |
Debt Instrument [Line Items] |  |
Long Term Debt | 1,226 | 1,225
Senior Unsecured Debt Due 2065 4.50% [Member] |  |
Debt Instrument [Line Items] |  |
Long Term Debt | 246 | 246
Euro Senior Unsecured Debt Due 2022 0.70% [Member] |  |
Debt Instrument [Line Items] |  |
Long Term Debt |  | 695
Euro Senior Unsecured Debt Due 2023 1.00% [Member] |  |
Debt Instrument [Line Items] |  |
Long Term Debt |  | 815
Senior Unsecured Debt Due 2098 7.60% [Member] |  |
Debt Instrument [Line Items] |  |
Long Term Debt | 237 | 237
Euro Senior Unsecured Debt Due 2026 0.45% [Member] |  |
Debt Instrument [Line Items] |  |
Long Term Debt | 607 | 541
Euro Senior Unsecured Debt Due 2027 1.625% [Member] |  |
Debt Instrument [Line Items] |  |
Long Term Debt | 1,516 | 1,351
Euro Senior Unsecured Debt Due 2029 0.45% [Member] |  |
Debt Instrument [Line Items] |  |
Long Term Debt | 725 |
Euro Senior Unsecured Debt Due 2032 1.30% [Member] |  |
Debt Instrument [Line Items] |  |
Long Term Debt | 604 | $ 539
Euro Senior Unsecured Debt Due 2033 0.95% [Member] |  |
Debt Instrument [Line Items] |  |
Long Term Debt | $ 784 |

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