Income Taxes (Tax Carryforwards) (Details) $ in Millions	Aug. 31, 2021 USD ($)
Domestic - federal
Operating Loss Carryforwards [Line Items]
Tax credit carryforwards	$ 8
Domestic - state
Operating Loss Carryforwards [Line Items]
Income tax net operating loss carryforwards	56
Tax credit carryforwards	3
Foreign
Operating Loss Carryforwards [Line Items]
Income tax net operating loss carryforwards	646
Tax credit carryforwards	10
Tax capital loss carryforwards | Domestic - federal
Operating Loss Carryforwards [Line Items]
Tax credit carryforwards	$ 77