Capital Stock - Changes in Issued and Outstanding Common Shares (Details) - USD ($) $ in Millions	12 Months Ended
	Feb. 29, 2020	Feb. 28, 2019	Feb. 28, 2018	Feb. 21, 2019
Common Stock [Roll Forward]
Capital stock outstanding, Shares, Beginning Balance	547,357,972
Exercised during the year, Number	1,189,000
Capital stock outstanding, Shares, Ending Balance	554,199,016	547,357,972
Common Stock, Amount [Roll Forward]
Exercise of stock options	$ 3	$ 1	$ 4
Stock-based compensation	63	67	49
Exchange shares related to Cylance acquisition		35
Share repurchases			(18)
Pre-combination service of replacement awards included in purchase consideration				$ 21
Value Pre-combination service of replacement awards included in purchase consideration		21
Employee share purchase plan	$ 6	$ 4	$ 4
Capital Stock and Additional Paid-In Capital [Member]
Common Stock [Roll Forward]
Capital stock outstanding, Shares, Beginning Balance	547,358,000	536,734,000	530,497,000
Exercised during the year, Number	1,189,000	105,000	536,000
Stock Issued During Period, Shares, Restricted Stock Award, Gross	3,361,000	10,156,000	7,258,000
Stock Repurchased and Retired During Period, Shares		0	(1,992,000)
Common shares issued for employee share purchase plan	911,000	363,000	435,000
Capital stock outstanding, Shares, Ending Balance	554,199,000	547,358,000	536,734,000
Common Stock, Amount [Roll Forward]
Capital stock outstanding, Value, Beginning Balance	$ (2,688)	$ (2,560)	$ (2,512)
Exercise of stock options	3	1	4
Stock-based compensation	$ 63	67	49
Exchange shares related to Cylance acquisition		35
Share repurchases			(9)
Value Pre-combination service of replacement awards included in purchase consideration		21
Common share issued related to exchange shares	1,380,000
Employee share purchase plan	$ 6	4	4
Capital stock outstanding, Value, Ending Balance	$ (2,760)	$ (2,688)	$ (2,560)