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Service Fees and Other Revenue and Other Expenses - Other Expenses (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Service Fees and Other Revenue and Other Expenses [Abstract] |  |  |
Data processing and equipment | $ 2,805 | $ 2,606 | $ 2,431
Professional services | 2,029 | 2,074 | 1,958
Net unrealized and realized losses (gains) on Amex Ventures investments | 152 | 302 | (767)
Other | 1,821 | 1,499 | 1,195
Total Other expenses | $ 6,807 | $ 6,481 | $ 4,817

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- Definition Realized and Unrealized Gains (Losses) on Equity Securities in the Amex Ventures Portfolio + References No definition available. + Details
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- Definition A fee charged for services from professionals such as doctors, lawyers and accountants. The term is often expanded to include other professions, for example, pharmacists charging to maintain a medicinal profile of a client or customer. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 946 -SubTopic 830 -Name Accounting Standards Codification -Section 55 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480167/946-830-55-10 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 946 -SubTopic 220 -Name Accounting Standards Codification -Section 45 -Paragraph 3 -Subparagraph (k) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483581/946-220-45-3 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 946 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-07(2)(b)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483575/946-220-S99-1 + Details
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