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Commitments, Contingent Liabilities and Guarantees - Visa Funding and Bancorp Cash Payments (Details) - USD ($) $ in Millions		3 Months Ended				180 Months Ended
	Jul. 07, 2026	Mar. 31, 2026	Dec. 31, 2025	Sep. 30, 2025	Mar. 31, 2025	Dec. 31, 2024	Jun. 30, 2026	Dec. 31, 2008
Visa Funding
Loss Contingencies
Visa Funding Amount		$ 125	$ 500	$ 500	$ 375	$ 8,115	$ 250	$ 3,000
Bancorp Cash Payment
Loss Contingencies
Bancorp Cash Payment Amount		$ 6	$ 21	$ 21	$ 15	$ 354
Bancorp Cash Payment | Subsequent Event
Loss Contingencies
Bancorp Cash Payment Amount	$ 12

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- Definition

The designation of funds furnished by a borrower to a lender to assure future payments of the borrower's real estate taxes and insurance obligations with respect to a mortgaged property. Escrow deposits may be made for a variety of other purposes such as earnest money and contingent payments. This element excludes replacement reserves which are an escrow separately provided for within the US GAAP taxonomy.

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The increase (decrease) during the period in the carrying value of derivative instruments reported as liabilities that are due to be disposed of within one year (or the normal operating cycle, if longer).

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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