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Capital Stock Capital Stock - 2019 Executive Chair Incentive Grant (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Feb. 28, 2021	Feb. 29, 2020	Feb. 28, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Date	Nov. 03, 2023
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
Time-based RSU [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation, amount to vest annually for each Time-based Tranche	1,000,000
Number of awards granted			5,000,000
Date of first vest for time-based RSU			Nov. 03, 2019
Market-condition RSU [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation, amount to vest for each Market Condition Tranche			1,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Date		Nov. 03, 2023
Number of days to calculate average NYSE price			10
Market-condition RSU [Member] \| Tranche 1 [Domain]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
10-day average closing price on NYSE			$ 16
Market-condition RSU [Member] \| Tranche 2 [Domain]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
10-day average closing price on NYSE			17
Market-condition RSU [Member] \| Tranche 3 [Domain]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
10-day average closing price on NYSE			18
Market-condition RSU [Member] \| Tranche 4 [Domain]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
10-day average closing price on NYSE			19
Market-condition RSU [Member] \| Tranche 5 [Domain]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
10-day average closing price on NYSE			$ 20
Contingent cash award amount			$ 90
Contingent cash award [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
10-day average closing price on NYSE			$ 30
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Date			Nov. 03, 2023
Number of days to calculate average NYSE price			10
Contingent cash award expense	$ 8	$ 1	$ 1
Contingent cash award liability	$ 8	$ 1