Borrowings - Schedule of Senior Notes (Details) - USD ($) $ in Millions	Jun. 30, 2026	Jun. 30, 2025
Debt Instrument [Line Items]
Total public debt	$ 6,650	$ 6,650
Less: unamortized discount and debt issuance costs	(44)	(48)
Total borrowings	6,606	6,602
Senior notes | 4.709% senior notes due 2029
Debt Instrument [Line Items]
Total public debt	$ 2,000	2,000
Stated interest rate of debt instrument	4.709%
Senior notes | 3.500% senior notes due 2030
Debt Instrument [Line Items]
Total public debt	$ 600	600
Stated interest rate of debt instrument	3.50%
Senior notes | 6.500% senior notes due 2033
Debt Instrument [Line Items]
Total public debt	$ 1,250	1,250
Stated interest rate of debt instrument	6.50%
Senior notes | 5.476% senior notes due 2039
Debt Instrument [Line Items]
Total public debt	$ 1,250	1,250
Stated interest rate of debt instrument	5.476%
Senior notes | 5.576% senior notes due 2049
Debt Instrument [Line Items]
Total public debt	$ 1,550	$ 1,550
Stated interest rate of debt instrument	5.576%