Capital Stock - Restricted Share Unit Activity (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
Feb. 29, 2020	Feb. 28, 2019	Feb. 28, 2018
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	16,902,445	14,245,412
Allocated Share-based Compensation Expense	$ 57	$ 66	$ 48
Number (000’s)
Beginning balance	17,758,000
Grants during the period, Number	16,902,000
Vested during the period, Number	(3,361,000)
Cancelled during the period, Number	(6,797,000)
Ending balance	24,502,000	17,758,000
Expected to Vest, Outstanding Number	22,284,000
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	$ 9.48
Granted during the period, Weighted Average Grant Date Fair Value	7.19	$ 9.45	$ 10.84
Vested during the period, Weighted-Average Grant Date Fair Value	9.90
Cancelled during the period, Weighted-Average Grant Date Fair Value	9.15
Ending balance, Weighted-Average Grant Date Fair Value	7.93	$ 9.48
Expected to Vest, Weighted Average Grant Date Fair Value	$ 7.88
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 24 days
Aggregate Intrinsic Value	$ 127
Vested and Expected to Vest, Average Remaining Contractual Life in Years	1 year 7 months 24 days
Vested and Expected to Vest, Intrinsic Value	$ 115
Unrecognized compensation expense related to restricted share unit plan	$ 104
Weighted-average vesting period related to unrecognized share-based compensation on unvested awards	1 year 10 months 2 days
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value	$ 33	$ 73	$ 54
Restricted Share Units (RSUs)
Number (000’s)
Cancelled during the period, Number	(3,122,140)
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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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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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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Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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Intrinsic value of outstanding award under share-based payment arrangement. Excludes share and unit options.

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