Loans and Related Allowance for Credit Losses (Subsequently Defaulted TDRs) (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
TDRs
Financing Receivable [Line Items]
Amortized Cost - Subsequently Defaulted TDRs	$ 82	$ 102	$ 153	$ 150

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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