Capital Stock - Changes in Issued and Outstanding Common Shares (Details) - USD ($) $ in Millions	12 Months Ended
	Feb. 28, 2021	Feb. 29, 2020	Feb. 28, 2019	Feb. 21, 2019
Common Stock [Roll Forward]
Capital stock outstanding, Shares, Beginning Balance	554,199,016
Exercised during the year, Number	3,072,000
Capital stock outstanding, Shares, Ending Balance	565,505,328	554,199,016
Common Stock, Amount [Roll Forward]
Exercise of stock options	$ 12	$ 3	$ 1
Stock-based compensation	44	63	67
Exchange shares related to Cylance acquisition			35
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	$ 7	$ 6	$ 4
Capital Stock and Additional Paid-In Capital [Member]
Common Stock [Roll Forward]
Capital stock outstanding, Shares, Beginning Balance	554,199,000	547,358,000	536,734,000
Exercised during the year, Number	3,072,000	1,189,000	105,000
Stock Issued During Period, Shares, Restricted Stock Award, Gross	5,330,000	3,361,000	10,156,000
Common share issued related to exchange shares	1,380,000	1,380,000
Common shares issued for employee share purchase plan	1,524,000	911,000	363,000
Capital stock outstanding, Shares, Ending Balance	565,505,000	554,199,000	547,358,000
Common Stock, Amount [Roll Forward]
Capital stock outstanding, Value, Beginning Balance	$ (2,760)	$ (2,688)	$ (2,560)
Exercise of stock options	12	3	1
Stock-based compensation	44	63	67
Exchange shares related to Cylance acquisition			35
Value Pre-combination service of replacement awards included in purchase consideration			21
Employee share purchase plan	7	6	4
Capital stock outstanding, Value, Ending Balance	$ (2,823)	$ (2,760)	$ (2,688)