Risk Management Activities and Fair Value Measurements - Additional Information (Details) - USD ($) $ in Millions	Sep. 30, 2025	Jun. 30, 2025
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Cash equivalents	$ 9,900	$ 8,300
Fair value of long-term debt	29,600	29,500
Current portion of long-term debt instruments	$ 6,000	$ 5,300
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	$ 772	$ 1,100
Fair Value Hedging | Underlying, Other
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Carrying amount of the underlying debt obligation	3,100	3,100
Net Investment Hedging | Underlying, Other
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Carrying amount of the underlying debt obligation	$ 11,200	$ 11,200