Income Taxes - Tax Carryforwards (Details) $ in Millions	Aug. 31, 2023 USD ($)
Domestic - federal
Operating Loss Carryforwards [Line Items]
Income tax net operating loss carryforwards	$ 11
Tax credit carryforwards	18
Domestic - federal | Tax capital loss carryforwards:
Operating Loss Carryforwards [Line Items]
Tax credit carryforwards	75
Domestic - state
Operating Loss Carryforwards [Line Items]
Income tax net operating loss carryforwards	55
Tax credit carryforwards	4
Foreign
Operating Loss Carryforwards [Line Items]
Income tax net operating loss carryforwards	646
Tax credit carryforwards	$ 4