Fair Value Disclosures - Rollforward of Level 3 Assets and Liabilities (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
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	$ 17	$ 21	$ 18	$ 23
Included in earnings	0	0	0	0
Purchases	0	0	0	0
Issuances	0	0	0	0
Sales	0	0	0	0
Settlements	(1)	0	(2)	0
Transfers out of level 3 and other		(1)
Acquisitions				(3)
Ending balance	16	20	16	20
Change in unrealized gains (losses) included in earnings for the period, attributable to assets and liabilities still held	0		0
Loan Servicing Rights
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	3,303	3,013	3,758	2,633
Included in earnings	70	260	65	617
Purchases	123	195	123	195
Issuances	92	123	140	281
Sales	(1)	(1)	(429)	(1)
Settlements	(90)	(124)	(160)	(259)
Transfers out of level 3 and other		0
Acquisitions				0
Ending balance	3,497	3,466	3,497	3,466
Change in unrealized gains (losses) included in earnings for the period, attributable to assets and liabilities still held	71		16
Net Derivatives
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	(18)	(74)	(36)	(12)
Included in earnings	(20)	(93)	(22)	(263)
Purchases	0	0	0	0
Issuances	18	23	16	40
Sales	0	0	0	0
Settlements	(11)	108	11	199
Transfers out of level 3 and other		0
Acquisitions				0
Ending balance	(31)	$ (36)	(31)	$ (36)
Change in unrealized gains (losses) included in earnings for the period, attributable to assets and liabilities still held	$ (9)		$ (20)