Fair Value Disclosures - Rollforward of Level 3 Assets and Liabilities (Details) - Level 3 - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Loans and Leases
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 10	$ 12	$ 11	$ 13
Included in earnings	0	0	0	0
Purchases	0	0	0	0
Issuances	0	0	0	0
Settlements	(1)	(1)	(2)	(2)
Transfers in	0		0
Ending balance	9	11	9	11
Change in unrealized gains (losses) included in earnings for the period, attributable to assets and liabilities still held	0	0	0	0
Loan Servicing Rights
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	4,293	3,612	3,972	3,708
Included in earnings	290	14	341	(15)
Purchases	480	182	755	182
Issuances	118	63	327	174
Settlements	(115)	(95)	(329)	(273)
Transfers in	0		0
Ending balance	5,066	3,776	5,066	3,776
Change in unrealized gains (losses) included in earnings for the period, attributable to assets and liabilities still held	291	14	341	(15)
Net Derivatives
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	(18)	(20)	(29)	(41)
Included in earnings	(34)	(7)	(31)	1
Purchases	0	0	0	0
Issuances	(31)	5	(48)	22
Settlements	31	(16)	56	(20)
Transfers in	(177)		(177)
Ending balance	(229)	(38)	(229)	(38)
Change in unrealized gains (losses) included in earnings for the period, attributable to assets and liabilities still held	$ (46)	$ (15)	$ (46)	$ (18)

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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- Definition

Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3).

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Amount of issuances of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of purchases of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of settlement of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of transfer of financial instrument classified as an asset into level 3 of the fair value hierarchy.

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Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of unrealized gain (loss) recognized in income for derivative asset (liability) after deduction of derivative liability (asset), measured at fair value using unobservable input (level 3) and still held.

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