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QUARTERLY CONSOLIDATED FINANCIAL INFORMATION (UNAUDITED) - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 7 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract] |  |
Gain as a result of acquisition of member interests in Visa Europe |  | $ 41.2
Provisional income tax benefit related to 2017 US Tax Reform Act | $ 158.7 |

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- Definition Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Provisional Income Tax Expense (Benefit) + References No definition available. + Details
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