Fair Value Measurements (Assets Held For Sale Measured At Fair Value) (Details) - USD ($) $ in Millions	Feb. 28, 2022	Aug. 31, 2021
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets held for sale, assets with fair value exceeding carrying value	$ 30
Level 2
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets held for sale, assets with carrying value approximating fair value	31	$ 31
Carrying Amount
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets held for sale	$ 31	$ 61