Risk Management Activities and Fair Value Measurements - Additional Information (Details) - USD ($) $ in Millions	Mar. 31, 2025	Jun. 30, 2024
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Cash equivalents	$ 7,900	$ 8,000
Fair value of long-term debt	27,900	27,700
Current portion of long-term debt instruments	$ 4,700	$ 3,800
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	OTHER NONCURRENT ASSETS, Prepaid expenses and other current assets	OTHER NONCURRENT ASSETS, Prepaid expenses and other current assets
Derivative Liability, Statement of Financial Position [Extensible Enumeration]	Accrued and other liabilities, OTHER NONCURRENT LIABILITIES	Accrued and other liabilities, OTHER NONCURRENT LIABILITIES
Collateral already posted, aggregate fair value	$ 269	$ 307
Fair Value Hedging | Underlying, Other
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Carrying amount of the underlying debt obligation	2,800	2,700
Net Investment Hedging | Underlying, Other
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Carrying amount of the underlying debt obligation	$ 10,900	$ 11,900