Earnings Per Share - Basic and Diluted Earnings Per Share Computations (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Aug. 31, 2020	Aug. 31, 2019	Aug. 31, 2020	Aug. 31, 2019
Earnings Per Share [Abstract]
Net income (loss) for basic and diluted earnings per share	$ (2,858)	$ 1,780	$ (8,014)	$ 2,567
Weighted-average shares outstanding (in shares)	775	689	727	691
Dilutive effect of equity plans (in shares)	0	2	0	2
Diluted weighted-average shares outstanding (in shares)	775	691	727	693
Basic earnings per share (in dollars per share)	$ (3.69)	$ 2.58	$ (11.03)	$ 3.72
Diluted earnings per share (in dollars per share)	$ (3.69)	$ 2.58	$ (11.03)	$ 3.71