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