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Business Combinations and Discontinued Operations - Deposit Liabilities, Type (Details) - USD ($) $ in Millions	Jun. 30, 2025	May 18, 2025	Dec. 31, 2024
Business Combination [Line Items]
Interest-bearing deposits	$ 440,231		$ 336,585
Discover
Business Combination [Line Items]
Time deposits		$ 39,623
Other interest-bearing deposits		65,578
Interest-bearing deposits		$ 105,201

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