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		9 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2025	Mar. 31, 2024
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Amount of gain (loss) excluded from effectiveness testing, which was recognized in earnings	$ 60	$ 53	$ 167	$ 182
Gain/(loss) recognized in AOCI	(436)	262	(221)	102
Foreign currency interest rate contracts
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Amount of Gain/(Loss) Recognized in OCI on Derivatives	$ (473)	$ 269	$ (117)	$ 67