Unaudited Condensed Consolidated Statements of Shareholders' Equity - USD ($) shares in Millions, $ in Millions	Total	CAPITAL IN EXCESS OF STATED VALUE	ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)	RETAINED EARNINGS (DEFICIT)	Class A Common Stock	Class A Common Stock COMMON STOCK	Class B Common Stock	Class B Common Stock COMMON STOCK
Beginning Balance (in shares) at May. 31, 2019						315		1,253
Beginning balance at May. 31, 2019	$ 9,040	$ 7,163	$ 231	$ 1,643		$ 0		$ 3
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock options exercised (in shares)								11
Stock options exercised	381	381
Repurchase of Class B Common Stock (in shares)								(22)
Repurchase of Class B Common Stock	(1,917)	(102)		(1,815)
Dividends on common stock and preferred stock	(727)			(727)
Issuance Of Shares To Employees Shares Net Of Shares Withheld For Taxes								2
Issuance of shares to employees, net of shares withheld for employee taxes	82	87		(5)
Stock-based compensation	190	190
Net income	2,482			2,482
Other comprehensive income (loss)	(179)		(179)
Ending Balance (in shares) at Nov. 30, 2019						315		1,244
Ending balance at Nov. 30, 2019	9,351	7,719	52	1,577		$ 0		$ 3
Beginning Balance (in shares) at Aug. 31, 2019						315		1,245
Beginning balance at Aug. 31, 2019	9,200	7,296	180	1,721		$ 0		$ 3
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock options exercised (in shares)								7
Stock options exercised	265	265
Repurchase of Class B Common Stock (in shares)								(10)
Repurchase of Class B Common Stock	(922)	(47)		(875)
Dividends on common stock and preferred stock	(383)			(383)
Issuance Of Shares To Employees Shares Net Of Shares Withheld For Taxes								2
Issuance of shares to employees, net of shares withheld for employee taxes	94	95		(1)
Stock-based compensation	110	110
Net income	1,115			1,115
Other comprehensive income (loss)	(128)		(128)
Ending Balance (in shares) at Nov. 30, 2019						315		1,244
Ending balance at Nov. 30, 2019	9,351	7,719	52	1,577		$ 0		$ 3
Beginning Balance (in shares) at May. 31, 2020					315	315	1,243	1,243
Beginning balance at May. 31, 2020	8,055	8,299	(56)	(191)		$ 0		$ 3
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock options exercised (in shares)								15
Stock options exercised	657	657
Conversion to Class B Common Stock (in shares)						(10)		10
Conversion to Class B Common Stock	0
Dividends on common stock and preferred stock	(820)			(820)
Issuance Of Shares To Employees Shares Net Of Shares Withheld For Taxes								2
Issuance of shares to employees, net of shares withheld for employee taxes	27	55		(28)
Stock-based compensation	325	325
Net income	2,769			2,769
Other comprehensive income (loss)	(373)		(373)
Ending Balance (in shares) at Nov. 30, 2020					305	305	1,270	1,270
Ending balance at Nov. 30, 2020	10,640	9,336	(429)	1,730		$ 0		$ 3
Beginning Balance (in shares) at Aug. 31, 2020						315		1,250
Beginning balance at Aug. 31, 2020	9,224	8,695	(401)	927		$ 0		$ 3
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock options exercised (in shares)								8
Stock options exercised	366	366
Conversion to Class B Common Stock (in shares)						(10)		10
Conversion to Class B Common Stock	0
Dividends on common stock and preferred stock	(437)			(437)
Issuance Of Shares To Employees Shares Net Of Shares Withheld For Taxes								2
Issuance of shares to employees, net of shares withheld for employee taxes	75	86		(11)
Stock-based compensation	189	189
Net income	1,251			1,251
Other comprehensive income (loss)	(28)		(28)
Ending Balance (in shares) at Nov. 30, 2020					305	305	1,270	1,270
Ending balance at Nov. 30, 2020	$ 10,640	$ 9,336	$ (429)	$ 1,730		$ 0		$ 3