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Loans and Related Allowance for Credit Losses (Subsequently Defaulted TDRs) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
TDRs
Financing Receivable [Line Items]
Amortized Cost - Subsequently Defaulted TDRs	$ 26	$ 96	$ 179	$ 246

X

- Definition

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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- Definition

Amortized cost of financing receivable with payment default in current period and modified within previous 12 months preceding payment default for debtor experiencing financial difficulty.

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