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Fair Value Measurements (Fair Value of Assets and Liabilities Measured on a Recurring Basis) (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Jun. 30, 2024 | Jun. 30, 2024 | Jul. 10, 2023 | Jun. 30, 2023
--- | --- | --- | --- | --- | ---
Transaction Data System Investment |  |  |  |  |
Assets: |  |  |  |  |
Equity ownership percentage | 16.00% | 16.00% |  |  |
Fair Value, Measurements, Recurring |  |  |  |  |
Assets: |  |  |  |  |
Cash equivalents |  |  | $ 1,442 |  | $ 1,253
Forward contracts |  |  | (87) |  | (73)
Other investments |  |  | 108 |  | 101
Liabilities: |  |  |  |  |
Forward contracts |  |  | (87) |  | (73)
Fair Value, Measurements, Recurring | Level 1 |  |  |  |  |
Assets: |  |  |  |  |
Cash equivalents |  |  | 1,442 |  | 1,253
Forward contracts |  |  | 0 |  | 0
Other investments |  |  | 108 |  | 101
Liabilities: |  |  |  |  |
Forward contracts |  |  | 0 |  | 0
Fair Value, Measurements, Recurring | Level 2 |  |  |  |  |
Assets: |  |  |  |  |
Cash equivalents |  |  | 0 |  | 0
Forward contracts |  |  | (87) |  | (73)
Other investments |  |  | 0 |  | 0
Liabilities: |  |  |  |  |
Forward contracts |  |  | (87) |  | (73)
Fair Value, Measurements, Recurring | Level 3 |  |  |  |  |
Assets: |  |  |  |  |
Cash equivalents |  |  | 0 |  | 0
Forward contracts |  |  | 0 |  | 0
Other investments |  |  | 0 |  | 0
Liabilities: |  |  |  |  |
Forward contracts |  |  | $ 0 |  | $ 0
Fair Value, Nonrecurring | Level 3 | Transaction Data System Investment |  |  |  |  |
Assets: |  |  |  |  |
Equity Method Investments, Fair Value Disclosure |  |  |  | $ 147 |

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