Capital Stock - Restricted Share Unit Activity (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
Feb. 28, 2021	Feb. 29, 2020	Feb. 28, 2019
Restricted Share Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee Service Share Based Compensation Tax Deficiencies Realized From Exercise Of Stock Options	$ 0	$ 0	$ 0
Number of awards granted	8,620,551	16,902,445
Allocated Share-based Compensation Expense	$ 38	$ 57	$ 66
Number (000’s)
Beginning balance	24,502,000
Grants during the period, Number	8,621,000
Vested during the period, Number	(5,330,000)
Cancelled during the period, Number	(5,718,000)
Ending balance	22,075,000	24,502,000
Expected to Vest, Outstanding Number	19,614,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments other than Options, Weighted Average Grant Date Fair Value [Roll Forward]
Beginning balance, Weighted-Average Grant Date Fair Value	$ 7.93
Granted during the period, Weighted Average Grant Date Fair Value	5.54	$ 7.19	$ 9.45
Vested during the period, Weighted-Average Grant Date Fair Value	8.22
Cancelled during the period, Weighted-Average Grant Date Fair Value	6.82
Ending balance, Weighted-Average Grant Date Fair Value	7.88	$ 7.93
Expected to Vest, Weighted Average Grant Date Fair Value	$ 7.33
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]
Average Remaining Contractual Life in Years	1 year 7 months 6 days
Aggregate Intrinsic Value	$ 222
Vested and Expected to Vest, Average Remaining Contractual Life in Years	1 year 7 months 2 days
Vested and Expected to Vest, Intrinsic Value	$ 197
Unrecognized compensation expense related to restricted share unit plan	$ 80
Weighted-average vesting period related to unrecognized share-based compensation on unvested awards	1 year 7 months 28 days
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value	$ 44	$ 33	$ 73
Restricted Share Units (RSUs) \| Replacement award [Member]
Number (000’s)
Grants during the period, Number			824,046

Employee service share based compensation tax deficiencies realized from exercise of stock options.

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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