Borrowings - Schedule of Senior Notes (Details) - USD ($) $ in Millions	Jun. 30, 2024	Jun. 30, 2023
Debt Instrument [Line Items]
Total public debt	$ 7,250	$ 7,250
Less: unamortized discount and debt issuance costs	(53)	(40)
Total borrowings	7,197	7,210
Senior notes | 4.030% senior notes due 2024
Debt Instrument [Line Items]
Total public debt	$ 0	1,250
Stated interest rate of debt instrument	4.03%
Senior notes | 3.050% senior notes due 2025
Debt Instrument [Line Items]
Total public debt	$ 600	$ 600
Stated interest rate of debt instrument	3.05%	4.03%
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	0
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%