Derivative Instruments - Additional Information (Details) - USD ($) $ in Millions	9 Months Ended
	Apr. 30, 2022	Jul. 31, 2021
Derivative [Line Items]
Right of set-off, reduction in derivative liabilities	$ 66	$ 17
Right of set-off, reduction in derivative assets	66	17
Net cash collateral provided for	3
Net cash collateral received		109
Net derivative liability	$ 19	$ 3
Cash flow hedges
Derivative [Line Items]
Derivative average remaining maturity	24 months
Net investment hedges
Derivative [Line Items]
Derivative average remaining maturity	6 months