Sale of Certain Branch Assets and Liabilities - Narrative (Details) $ in Millions		12 Months Ended
		Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($) branch	Dec. 31, 2021 branch
Restructuring Cost and Reserve [Line Items]
Gain on sale of branch disposal group, net		$ 0	$ 0	$ 113
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal, Statement of Income or Comprehensive Income [Extensible Enumeration]				Gain on sale of branch disposal group, net
Loans held for sale	[1]	$ 406	$ 339
Disposed of by Sale | Retail Branches Sold
Restructuring Cost and Reserve [Line Items]
Gain on sale of branch disposal group, net				$ 113
Loans held for sale				2,148
Properties and equipment held for sale				45
Cash held for sale				16
Deposits held for sale				6,919
Lease liabilities held for sale				145
Other liabilities held for sale				$ 6
Exit of Mass Market Retail Banking Business
Restructuring Cost and Reserve [Line Items]
Number of branches sold | branch					90
Rebranding of Retail Branches
Restructuring Cost and Reserve [Line Items]
Number of branches rebranded | branch				22

[1] The following table summarizes assets and liabilities related to our consolidated variable interest entities ("VIEs") at December 31, 2024 and 2023. Assets and liabilities exclude intercompany balances that eliminate in consolidation. See Note 27, "Variable Interest Entities," for additional information. At December 31,20242023(in millions)AssetsOther assets$11 $23 Total assets$11 $23 LiabilitiesInterest, taxes and other liabilities$4 $17 Total liabilities$4 $17