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Fair Value Measurements (Fair Value of Assets and Liabilities Measured on a Recurring Basis) (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Jul. 10, 2023 | Jun. 30, 2023
--- | --- | --- | ---
Transaction Data System Investment |  |  |
Assets: |  |  |
Equity Method Investment, Ownership Percentage | 16.00% |  |
Recurring |  |  |
Assets: |  |  |
Cash equivalents | $ 2,013 |  | $ 1,253
Other investments | 105 |  | 101
Forward Contract | (70) |  | (73)
Liabilities: |  |  |
Forward Contract | (70) |  | (73)
Level 1 | Recurring |  |  |
Assets: |  |  |
Cash equivalents | 2,013 |  | 1,253
Other investments | 105 |  | 101
Forward Contract | 0 |  | 0
Liabilities: |  |  |
Forward Contract | 0 |  | 0
Level 2 | Recurring |  |  |
Assets: |  |  |
Cash equivalents | 0 |  | 0
Other investments | 0 |  | 0
Forward Contract | (70) |  | (73)
Liabilities: |  |  |
Forward Contract | (70) |  | (73)
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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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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