Risk Management Activities and Fair Value Measurements - Gains And Losses On Derivatives In Net Investment Hedges Recognized in OCI (Details) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Amount of gain (loss) excluded from effectiveness testing, which was recognized in earnings	$ 50	$ 67
Gain/(loss) recognized in AOCI	(611)	344
Foreign currency interest rate contracts
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Amount of Gain/(Loss) Recognized in OCI on Derivatives	$ (501)	$ 285