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Postretirement and Other Employee Benefits - Net Periodic Benefit Cost (Details) - USD ($)
$ in Millions
 12 Months Ended
Aug. 31, 2022
Aug. 31, 2021
Aug. 31, 2020
Retirement Benefits [Abstract]      
Service cost $ 25 $ 25 $ 25
Interest cost 4 5 3
Expected long-term return on plan assets (17) (16) (15)
Actuarial gain (6) (10) (3)
Amortization of actuarial gains (8) (6) 0
Net settlement loss 1 1 0
Prior service cost 4 1 0
Net periodic benefit cost $ 3 $ 0 $ 10
Gain (loss) corridor 10.00% 10.00% 10.00%
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Expected Return (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Other Nonoperating Income (Expense) Other Nonoperating Income (Expense) Other Nonoperating Income (Expense)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Amortization of Prior Service Cost (Credit), Statement of Income or Comprehensive Income [Extensible Enumeration] Other Nonoperating Income (Expense) Other Nonoperating Income (Expense) Other Nonoperating Income (Expense)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] Other Nonoperating Income (Expense) Other Nonoperating Income (Expense) Other Nonoperating Income (Expense)