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	Class A Convertible Common Stock	Class A Convertible Common Stock Common Stock	Class B Common Stock	Class B Common Stock Common Stock	Restatement Adjustment	Restatement Adjustment Retained Earnings
Beginning Balance (in shares) at May. 31, 2017						329		1,314
Beginning balance at May. 31, 2017	$ 12,407	$ 5,710	$ (213)	$ 6,907		$ 0		$ 3
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock options exercised (in shares)								20
Stock options exercised	490	490
Repurchase of Class B Common Stock (in shares)								(47)
Repurchase of Class B Common Stock	(2,713)	(168)		(2,545)
Dividends on common stock and preferred stock	(944)			(944)
Issuance of shares to employees, net of shares withheld for employee taxes (in shares)								3
Issuance of shares to employees, net of shares withheld for employee taxes	16	45		(29)
Stock-based compensation	158	158
Net income (loss)	796			796
Other comprehensive income (loss)	(428)		(428)
Ending Balance (in shares) at Feb. 28, 2018						329		1,290
Ending balance at Feb. 28, 2018	9,782	6,235	(624)	4,168		$ 0		$ 3
Beginning Balance (in shares) at Nov. 30, 2017						329		1,295
Beginning balance at Nov. 30, 2017	11,758	6,005	(587)	6,337		$ 0		$ 3
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock options exercised (in shares)								9
Stock options exercised	231	231
Repurchase of Class B Common Stock (in shares)								(15)
Repurchase of Class B Common Stock	(962)	(56)		(906)
Dividends on common stock and preferred stock	(324)			(324)
Issuance of shares to employees, net of shares withheld for employee taxes (in shares)								1
Issuance of shares to employees, net of shares withheld for employee taxes	(1)			(1)
Stock-based compensation	55	55
Net income (loss)	(921)			(921)
Other comprehensive income (loss)	(54)		(54)
Ending Balance (in shares) at Feb. 28, 2018						329		1,290
Ending balance at Feb. 28, 2018	9,782	6,235	(624)	4,168		$ 0		$ 3
Beginning Balance (in shares) at May. 31, 2018					329	329	1,272	1,272
Beginning balance at May. 31, 2018	9,812	6,384	(92)	3,517		$ 0		$ 3
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock options exercised (in shares)								14
Stock options exercised	419	419
Conversion to Class B Common Stock (in shares)						(14)		14
Conversion to Class B Common Stock	0
Repurchase of Class B Common Stock (in shares)								(44)
Repurchase of Class B Common Stock	(3,386)	(181)		(3,205)
Dividends on common stock and preferred stock	(1,013)			(1,013)
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	58	62		(4)
Stock-based compensation	226	226
Net income (loss)	3,040			3,040
Other comprehensive income (loss)	289		289
Ending Balance (in shares) at Feb. 28, 2019					315	315	1,258	1,258
Ending balance at Feb. 28, 2019	8,961	6,910	197	1,851		$ 0		$ 3
Ending balance (Adoption of ASU 2016-16 (Note 1)) at Feb. 28, 2019									$ (507)	$ (507)
Ending balance (Adoption of ASC Topic 606 (Note 1)) at Feb. 28, 2019									23	23
Beginning Balance (in shares) at Nov. 30, 2018						315		1,262
Beginning balance at Nov. 30, 2018	8,729	6,707	209	1,810		$ 0		$ 3
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock options exercised (in shares)								6
Stock options exercised	159	159
Repurchase of Class B Common Stock (in shares)								(10)
Repurchase of Class B Common Stock	(754)	(44)		(710)
Dividends on common stock and preferred stock	(347)			(347)
Issuance of shares to employees, net of shares withheld for employee taxes (in shares)
Issuance of shares to employees, net of shares withheld for employee taxes	(8)	(5)		(3)
Stock-based compensation	93	93
Net income (loss)	1,101			1,101
Other comprehensive income (loss)	(12)		(12)
Ending Balance (in shares) at Feb. 28, 2019					315	315	1,258	1,258
Ending balance at Feb. 28, 2019	$ 8,961	$ 6,910	$ 197	$ 1,851		$ 0		$ 3
Ending balance (Adoption of ASU 2016-16 (Note 1)) at Feb. 28, 2019									(507)	(507)
Ending balance (Adoption of ASC Topic 606 (Note 1)) at Feb. 28, 2019									$ 23	$ 23