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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, 2025
Sep. 30, 2024
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Amount of gain (loss) excluded from effectiveness testing, which was recognized in earnings $ 71 $ 50
Gain/(loss) recognized in AOCI 30 (611)
Foreign currency interest rate contracts    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Amount of Gain/(Loss) Recognized in OCI on Derivatives $ 14 $ (501)