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 |