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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 6 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2025
Dec. 31, 2024
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Amount of gain excluded from effectiveness testing, which was recognized in earnings $ 65 $ 57 $ 136 $ 107
Gain recognized in AOCI 9 825 39 215
Foreign currency interest rate contracts        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Amount of Gain/(Loss) Recognized in OCI on Derivatives $ (17) $ 857 $ (3) $ 356