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, 2020	May 31, 2019
Debt Instrument [Line Items]
Long Term Debt	$ 21,518	$ 17,518
Other debt		1
Finance lease obligations	485	62
Total Debt and Finance Lease Obligations	22,003	17,581
Less current portion	51	964
LONG-TERM DEBT, LESS CURRENT PORTION	21,952	16,617
Senior Unsecured Debt Due 2020 2.30% [Member]
Debt Instrument [Line Items]
Long Term Debt		400
Senior Unsecured Debt Due 2022 3.40% [Member]
Debt Instrument [Line Items]
Long Term Debt	498	497
Senior Unsecured Debt Due 2023 2.625-2.70% [Member]
Debt Instrument [Line Items]
Long Term Debt	748	747
Senior Unsecured Debt Due 2024 4.00% [Member]
Debt Instrument [Line Items]
Long Term Debt	747	746
Senior Unsecured Debt Due 2025 3.2-3.80% [Member]
Debt Instrument [Line Items]
Long Term Debt	1,687	696
Senior Unsecured Debt Due 2026 3.25% [Member]
Debt Instrument [Line Items]
Long Term Debt	745	745
Senior Unsecured Debt Due 2027 3.30% [Member]
Debt Instrument [Line Items]
Long Term Debt	446	446
Senior Unsecured Debt Due 2028 3.40% [Member]
Debt Instrument [Line Items]
Long Term Debt	496	495
Senior Unsecured Debt Due 2029 4.20% [Member]
Debt Instrument [Line Items]
Long Term Debt	397	396
Senior Unsecured Debt Due 2030 3.1-4.25% [Member]
Debt Instrument [Line Items]
Long Term Debt	1,732
Senior Unsecured Debt Due 2034 4.90% [Member]
Debt Instrument [Line Items]
Long Term Debt	495	495
Senior Unsecured Debt Due 2035 3.90% [Member]
Debt Instrument [Line Items]
Long Term Debt	494	494
Senior Unsecured Debt Due 2043 3.875-4.10% [Member]
Debt Instrument [Line Items]
Long Term Debt	984	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	2,460
Senior Unsecured Debt Due 2047 4.40% [Member]
Debt Instrument [Line Items]
Long Term Debt	735	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	835	835
Senior Unsecured Debt Due 2050 5.25% [Member]
Debt Instrument [Line Items]
Long Term Debt	1,225
Senior Unsecured Debt Due 2065 4.50% [Member]
Debt Instrument [Line Items]
Long Term Debt	246	246
Senior Unsecured Debt Due 2098 7.60% [Member]
Debt Instrument [Line Items]
Long Term Debt	237	237
Euro Senior Unsecured Debt Due 2020 0.50% [Member]
Debt Instrument [Line Items]
Long Term Debt		559
Euro Senior Unsecured Debt Due 2022 0.70% [Member]
Debt Instrument [Line Items]
Long Term Debt	695	713
Euro Senior Unsecured Debt Due 2023 1.00% [Member]
Debt Instrument [Line Items]
Long Term Debt	815	836
Euro Senior Unsecured Debt Due 2026 0.45% [Member]
Debt Instrument [Line Items]
Long Term Debt	541
Euro Senior Unsecured Debt Due 2027 1.625% [Member]
Debt Instrument [Line Items]
Long Term Debt	1,351	$ 1,387
Euro Senior Unsecured Debt Due 2032 1.30% [Member]
Debt Instrument [Line Items]
Long Term Debt	$ 539