Summary of Significant Accounting Policies - New Accounting Pronouncements (Details) - USD ($) $ in Millions	Jun. 01, 2019	May 31, 2019	Jun. 01, 2018	May 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained earnings		$ 1,643		$ 3,517
Accounts receivable, net		4,272		3,498
Prepaid expenses and other current assets		1,968		1,130
Total current assets		16,525		15,134
TOTAL ASSETS		23,717		22,536
Accrued liabilities		5,010		3,269
Total current liabilities		7,866		6,040
TOTAL LIABILITIES AND SHAREHOLDERS’ EQUITY		23,717		$ 22,536
Calculated under Revenue Guidance in Effect before Topic 606 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Accounts receivable, net		3,490
Prepaid expenses and other current assets		1,558
Total current assets		15,333
TOTAL ASSETS		22,525
Accrued liabilities		3,818
Total current liabilities		6,674
TOTAL LIABILITIES AND SHAREHOLDERS’ EQUITY		22,525
Accounting Standards Update 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained earnings			$ 23
Accounting Standards Update 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Accounts receivable, net		782
Prepaid expenses and other current assets		410
Total current assets		1,192
TOTAL ASSETS		1,192
Accrued liabilities		1,192
Total current liabilities		1,192
TOTAL LIABILITIES AND SHAREHOLDERS’ EQUITY		$ 1,192
Subsequent Event | Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
TOTAL ASSETS	$ 2,800
Operating lease, liability	$ 2,800