Sale of Certain Branch Assets and Liabilities - Narrative (Details) $ in Millions		1 Months Ended	3 Months Ended		6 Months Ended		12 Months Ended
		Feb. 28, 2022 USD ($) branch	Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($)	Dec. 31, 2021 branch	Dec. 31, 2022 USD ($)
Restructuring Cost and Reserve [Line Items]
Gain on sale of branch disposal group, net			$ 0	$ 0	$ 0	$ 111
Loans held for sale	[1]		$ 997		$ 997			$ 354
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Retail Branches Sold
Restructuring Cost and Reserve [Line Items]
Gain on sale of branch disposal group, net		$ 111
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 June 30, 2023 and December 31, 2022. Assets and liabilities exclude intercompany balances that eliminate in consolidation. See Note 17, "Variable Interest Entities," for additional information. June 30, 2023December 31, 2022(in millions)AssetsLoans, net$186 $162 Other assets40 44 Total assets$226 $206 LiabilitiesInterest, taxes and other liabilities$35 $22 Total liabilities$35 $22