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Fair Value Measurements (Fair Value of Assets and Liabilities Measured on a Recurring Basis) (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Jun. 30, 2024 | Jul. 10, 2023
--- | --- | --- | ---
Transaction Data System Investment |  |  |
Assets: |  |  |
Equity Method Investment, Ownership Percentage | 16.00% |  |
Recurring |  |  |
Assets: |  |  |
Cash equivalents | $ 1,086 | $ 1,442 |
Other investments | 107 | 108 |
Forward Contract | (64) | (87) |
Liabilities: |  |  |
Forward Contract | (64) | (87) |
Level 1 | Recurring |  |  |
Assets: |  |  |
Cash equivalents | 1,086 | 1,442 |
Other investments | 107 | 108 |
Forward Contract | 0 | 0 |
Liabilities: |  |  |
Forward Contract | 0 | 0 |
Level 2 | Recurring |  |  |
Assets: |  |  |
Cash equivalents | 0 | 0 |
Other investments | 0 | 0 |
Forward Contract | (64) | (87) |
Liabilities: |  |  |
Forward Contract | (64) | (87) |
Level 3 | Recurring |  |  |
Assets: |  |  |
Cash equivalents | 0 | 0 |
Other investments | 0 | 0 |
Forward Contract | 0 | 0 |
Liabilities: |  |  |
Forward Contract | $ 0 | $ 0 |
Level 3 | Fair Value, Nonrecurring | Transaction Data System Investment |  |  |
Assets: |  |  |
Equity Method Investments, Fair Value Disclosure |  |  | $ 147

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