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Business Combinations and Discontinued Operations - Deposit Liabilities, Type (Details) - USD ($) $ in Millions	Sep. 30, 2025	May 18, 2025	Dec. 31, 2024
Business Combination [Line Items]
Time deposits		$ 39,630
Interest-bearing deposits	$ 441,136	105,208	$ 336,585
Discover
Business Combination [Line Items]
Other interest-bearing deposits		$ 65,578

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Deposits, Others

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No definition available.

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