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Loans and ACL - Narrative (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2026	Jun. 30, 2026	Jun. 30, 2025
Financing Receivable
Trial modifications		$ 168	$ 42
Unfunded lending commitments related to the modified obligations	$ 405	405	$ 430
Commercial:
Financing Receivable
Allowance increase (decrease)	(26)	(35)
Consumer:
Financing Receivable
Allowance increase (decrease)	$ (17)	$ (12)

X

- Definition

Amount of increase (decrease) in allowance for credit loss on financing receivable.

+ References

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-Topic 310
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Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

Amortized cost excluding accrued interest, of financing receivable modified during period for debtor experiencing financial difficulty.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

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+ References

No definition available.

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- Definition

Amount of commitment to lend additional funds to debtor experiencing financial difficulty for which creditor has modified terms of financing receivable.

+ References

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