Risk Management Activities and Fair Value Measurements - Notional Amounts And Fair Values Of Qualifying And Non-Qualifying Financial Instruments Used In Hedging Transactions (Details) - USD ($) $ in Millions	Dec. 31, 2025	Jun. 30, 2025
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional Amount	$ 21,709	$ 18,730
Fair Value Asset	33	19
Fair Value (Liability)	(712)	(1,062)
Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional Amount	17,328	15,154
Fair Value Asset	3	0
Fair Value (Liability)	(709)	(1,061)
Interest rate contracts \| Fair Value Hedging
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional Amount	5,336	3,280
Fair Value Asset	0	0
Fair Value (Liability)	(207)	(201)
Foreign currency interest rate contracts \| Not Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional Amount	4,381	3,576
Fair Value Asset	30	19
Fair Value (Liability)	(4)	0
Foreign currency interest rate contracts \| Net Investment Hedging
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional Amount	11,992	11,874
Fair Value Asset	3	0
Fair Value (Liability)	$ (502)	$ (860)

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