Fair Value Disclosures - Rollforward of Level 3 Assets and Liabilities (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Primary income statement location loan servicing rights			Mortgage banking income
Primary income statement location loan servicing rights			Mortgage banking income
Loans and Leases
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 12	$ 14	$ 13	$ 15
Included in earnings	0	0	0	0
Issuances	0	0	0	0
Sales		0		0
Settlements	0	0	(1)	(1)
Ending balance	12	14	12	14
Change in unrealized gains (losses) included in earnings for the period, attributable to assets and liabilities still held	0		0
Servicing Contracts [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	3,628	3,417	3,708	3,378
Included in earnings	27	30	(29)	112
Issuances	54	52	111	84
Sales		(1)		(2)
Settlements	(97)	(88)	(178)	(162)
Ending balance	3,612	3,410	3,612	3,410
Change in unrealized gains (losses) included in earnings for the period, attributable to assets and liabilities still held	27		(29)
Net Derivatives
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	(33)	(21)	(41)	(19)
Included in earnings	2	(4)	8	(7)
Issuances	13	12	17	11
Sales		0		0
Settlements	(2)	(7)	(4)	(5)
Ending balance	(20)	$ (20)	(20)	$ (20)
Change in unrealized gains (losses) included in earnings for the period, attributable to assets and liabilities still held	$ 4		$ 1