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)								11
Stock options exercised	259	259
Repurchase of Class B Common Stock (in shares)								(32)
Repurchase of Class B Common Stock	(1,751)	(112)		(1,639)
Dividends on common stock and preferred stock	(620)			(620)
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	17	45		(28)
Stock-based compensation	103	103
Net income	1,717			1,717
Other comprehensive income (loss)	(374)		(374)
Ending Balance (in shares) at Nov. 30, 2017						329		1,295
Ending balance at Nov. 30, 2017	11,758	6,005	(587)	6,337		$ 0		$ 3
Beginning Balance (in shares) at Aug. 31, 2017						329		1,308
Beginning balance at Aug. 31, 2017	11,993	5,839	(586)	6,737		$ 0		$ 3
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock options exercised (in shares)								3
Stock options exercised	103	103
Repurchase of Class B Common Stock (in shares)								(17)
Repurchase of Class B Common Stock	(902)	(60)		(842)
Dividends on common stock and preferred stock	(325)			(325)
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	70	70
Stock-based compensation	53	53
Net income	767			767
Other comprehensive income (loss)	(1)		(1)
Ending Balance (in shares) at Nov. 30, 2017						329		1,295
Ending balance at Nov. 30, 2017	11,758	6,005	(587)	6,337		$ 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)								8
Stock options exercised	260	260
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)								(34)
Repurchase of Class B Common Stock	(2,632)	(137)		(2,495)
Dividends on common stock and preferred stock	(666)			(666)
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	67		(1)
Stock-based compensation	133	133
Net income	1,939			1,939
Other comprehensive income (loss)	301		301
Ending Balance (in shares) at Nov. 30, 2018					315	315	1,262	1,262
Ending balance at Nov. 30, 2018	8,729	6,707	209	1,810		$ 0		$ 3
Ending balance (Adoption of ASU 2016-16 (Note 1)) at Nov. 30, 2018									$ (507)	$ (507)
Ending balance (Adoption of ASC Topic 606 (Note 1)) at Nov. 30, 2018									23	23
Beginning Balance (in shares) at Aug. 31, 2018						320		1,269
Beginning balance at Aug. 31, 2018	8,992	6,525	(30)	2,494		$ 0		$ 3
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock options exercised (in shares)								2
Stock options exercised	78	78
Conversion to Class B Common Stock (in shares)						(5)		5
Conversion to Class B Common Stock	0
Repurchase of Class B Common Stock (in shares)								(16)
Repurchase of Class B Common Stock	(1,251)	(68)		(1,183)
Dividends on common stock and preferred stock	(348)			(348)
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	80	80
Stock-based compensation	92	92
Net income	847			847
Other comprehensive income (loss)	239		239
Ending Balance (in shares) at Nov. 30, 2018					315	315	1,262	1,262
Ending balance at Nov. 30, 2018	$ 8,729	$ 6,707	$ 209	$ 1,810		$ 0		$ 3
Ending balance (Adoption of ASU 2016-16 (Note 1)) at Nov. 30, 2018									(507)	(507)
Ending balance (Adoption of ASC Topic 606 (Note 1)) at Nov. 30, 2018									$ 23	$ 23