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
Beginning balance (Adoption of ASC Topic 842) at May. 31, 2019	(1)			(1)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock options exercised (in shares)								17
Stock options exercised	580	580
Repurchase of Class B Common Stock (in shares)								(32)
Repurchase of Class B Common Stock	(2,874)	(150)		(2,724)
Dividends on common stock and preferred stock	(1,110)			(1,110)
Issuance of shares to employees, net of shares withheld for employee taxes (in shares)								2
Issuance of shares to employees, net of shares withheld for employee taxes	66	75		(9)
Stock-based compensation	303	303
Net income	3,329			3,329
Other comprehensive income (loss)	(288)		(288)
Ending Balance (in shares) at Feb. 29, 2020						315		1,240
Ending balance at Feb. 29, 2020	$ 9,045	7,971	(57)	1,128		$ 0		$ 3
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201602Member
Beginning Balance (in shares) at Nov. 30, 2019						315		1,244
Beginning balance at Nov. 30, 2019	$ 9,351	7,719	52	1,577		$ 0		$ 3
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock options exercised (in shares)								6
Stock options exercised	199	199
Repurchase of Class B Common Stock (in shares)								(10)
Repurchase of Class B Common Stock	(957)	(48)		(909)
Dividends on common stock and preferred stock	(383)			(383)
Issuance of shares to employees, net of shares withheld for employee taxes	(16)	(12)		(4)
Stock-based compensation	113	113
Net income	847			847
Other comprehensive income (loss)	(109)		(109)
Ending Balance (in shares) at Feb. 29, 2020						315		1,240
Ending balance at Feb. 29, 2020	9,045	7,971	(57)	1,128		$ 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)								19
Stock options exercised	844	844
Conversion to Class B Common Stock (in shares)						(10)		10
Conversion to Class B Common Stock	0
Dividends on common stock and preferred stock	(1,256)			(1,256)
Issuance of shares to employees, net of shares withheld for employee taxes (in shares)								2
Issuance of shares to employees, net of shares withheld for employee taxes	(7)	35		(42)
Stock-based compensation	467	467
Net income	4,218			4,218
Other comprehensive income (loss)	(390)		(390)
Ending Balance (in shares) at Feb. 28, 2021					305	305	1,274	1,274
Ending balance at Feb. 28, 2021	11,931	9,645	(446)	2,729		$ 0		$ 3
Beginning Balance (in shares) at Nov. 30, 2020						305		1,270
Beginning balance at Nov. 30, 2020	10,640	9,336	(429)	1,730		$ 0		$ 3
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock options exercised (in shares)								4
Stock options exercised	187	187
Dividends on common stock and preferred stock	(436)			(436)
Issuance of shares to employees, net of shares withheld for employee taxes	(34)	(20)		(14)
Stock-based compensation	142	142
Net income	1,449			1,449
Other comprehensive income (loss)	(17)		(17)
Ending Balance (in shares) at Feb. 28, 2021					305	305	1,274	1,274
Ending balance at Feb. 28, 2021	$ 11,931	$ 9,645	$ (446)	$ 2,729		$ 0		$ 3