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		6 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2024	Dec. 31, 2023
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Amount of gain (loss) excluded from effectiveness testing, which was recognized in earnings	$ 57	$ 62	$ 107	$ 130
Gain/(loss) recognized in AOCI	825	(504)	215	(159)
Foreign currency interest rate contracts
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Amount of Gain/(Loss) Recognized in OCI on Derivatives	$ 857	$ (487)	$ 356	$ (202)