Income Taxes Income Taxes - Summary of Net Operating Loss and Tax Credits Carryforwards (Details) - USD ($) $ in Millions	Feb. 28, 2021	Feb. 29, 2020
Tax Credit Carryforward [Line Items]
Operating Loss Carryforwards	$ 1,539
Capital Loss Carryforward	19
Research and development tax credit	473
Minimum Taxes	206	$ 267
Tax Year 2029
Tax Credit Carryforward [Line Items]
Operating Loss Carryforwards	10
Capital Loss Carryforward	0
Research and development tax credit	0
Minimum Taxes	1
Tax Year 2030
Tax Credit Carryforward [Line Items]
Operating Loss Carryforwards	0
Capital Loss Carryforward	0
Research and development tax credit	0
Minimum Taxes	108
Tax Year 2031
Tax Credit Carryforward [Line Items]
Operating Loss Carryforwards	1
Capital Loss Carryforward	0
Research and development tax credit	23
Minimum Taxes	71
Tax Year 2032
Tax Credit Carryforward [Line Items]
Operating Loss Carryforwards	28
Capital Loss Carryforward	0
Research and development tax credit	1
Minimum Taxes	22
Tax Year 2033
Tax Credit Carryforward [Line Items]
Operating Loss Carryforwards	88
Capital Loss Carryforward	0
Research and development tax credit	146
Minimum Taxes	0
Tax Year 2034
Tax Credit Carryforward [Line Items]
Operating Loss Carryforwards	96
Capital Loss Carryforward	0
Research and development tax credit	120
Minimum Taxes	0
Tax Year 2035
Tax Credit Carryforward [Line Items]
Operating Loss Carryforwards	92
Capital Loss Carryforward	0
Research and development tax credit	52
Minimum Taxes	4
Tax Year 2036
Tax Credit Carryforward [Line Items]
Operating Loss Carryforwards	275
Capital Loss Carryforward	0
Research and development tax credit	39
Minimum Taxes	0
Tax Year 2037
Tax Credit Carryforward [Line Items]
Operating Loss Carryforwards	475
Capital Loss Carryforward	0
Research and development tax credit	23
Minimum Taxes	0
Tax Year 2038
Tax Credit Carryforward [Line Items]
Operating Loss Carryforwards	225
Capital Loss Carryforward	0
Research and development tax credit	17
Minimum Taxes	0
Tax Year 2039 [Member]
Tax Credit Carryforward [Line Items]
Operating Loss Carryforwards	13
Capital Loss Carryforward	0
Research and development tax credit	16
Minimum Taxes	0
Tax Year 2040
Tax Credit Carryforward [Line Items]
Operating Loss Carryforwards	0
Capital Loss Carryforward	0
Research and development tax credit	14
Minimum Taxes	0
Tax Year 2041
Tax Credit Carryforward [Line Items]
Operating Loss Carryforwards	0
Capital Loss Carryforward	0
Research and development tax credit	3
Minimum Taxes	0
Tax Year, Indefinite
Tax Credit Carryforward [Line Items]
Operating Loss Carryforwards	236
Capital Loss Carryforward	19
Research and development tax credit	19
Minimum Taxes	$ 0