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Significant Credit Concentrations (Details) - USD ($) $ in Billions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Maximum Credit Exposure by Category |  |
On-balance sheet | $ 170 | $ 147
Individuals [Member] |  |
Maximum Credit Exposure by Category |  |
On-balance sheet | 112 | 98
Financial Institutions [Member] |  |
Maximum Credit Exposure by Category |  |
On-balance sheet | 20 | 18
United States Government And Agencies [Member] |  |
Maximum Credit Exposure by Category |  |
On-balance sheet | 3 | 3
Financial Services |  |
Maximum Credit Exposure by Category |  |
On-balance sheet | $ 35 | $ 28

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- Definition Represents table detailing the Company's Card Member loans and receivables exposure (including unused lines-of-credit on Card Member loans) in the United States and outside the United States. + References No definition available. + Details
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- Definition Maximum amount of loss due to credit risk that, based on the gross fair value of the financial instrument, the entity would incur if parties to the financial instruments that make up the concentration failed completely to perform according to the terms of the contracts and the collateral or other security, if any, for the amount due proved to be of no value to the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13537-108611 + Details
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