Loans Held for Sale - Narrative (Details) - USD ($) $ in Millions		3 Months Ended			6 Months Ended
		Jun. 30, 2023	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022	Feb. 28, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held for sale	[1]	$ 997			$ 997		$ 354
Revenue (losses) associated with the economic hedging program		224	$ (977)		662	$ (1,442)
Commercial loans held for sale
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loans held-for-sale		374			374		237
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Retail Branches Sold
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held for sale								$ 2,148
Commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held for sale		996			996		349
Valuation allowance		37			37		0
Commercial loans | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Retail Branches Sold
Accounts, Notes, Loans and Financing Receivable [Line Items]
Sales of loans held for sale				$ 37
Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held for sale		1			1		5
Valuation allowance		0			0		0
Consumer loans | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Retail Branches Sold
Accounts, Notes, Loans and Financing Receivable [Line Items]
Sales of loans held for sale				2,102
Consumer loans | Exit of Mass Market Retail Banking Business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Sales of loans held for sale				904
Gain (loss) on sale of loans		(10)		(35)
Commercial Real Estate Loans Transferred From Portfolio Loans To Held For Sale | Commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held for sale		507			507
Loans Transferred From Portfolio Loans to Held For Sale | Commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held for sale		115			115		112
Residential mortgages | Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held for sale		1			1		$ 5
Residential mortgages | Consumer loans | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Retail Branches Sold
Accounts, Notes, Loans and Financing Receivable [Line Items]
Sales of loans held for sale				1,665
Residential mortgages | Consumer loans | Exit of Mass Market Retail Banking Business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Sales of loans held for sale				865
Home equity mortgages | Consumer loans | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Retail Branches Sold
Accounts, Notes, Loans and Financing Receivable [Line Items]
Sales of loans held for sale				185
Home equity mortgages | Consumer loans | Exit of Mass Market Retail Banking Business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Sales of loans held for sale				39
Credit cards | Consumer loans | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Retail Branches Sold
Accounts, Notes, Loans and Financing Receivable [Line Items]
Sales of loans held for sale				168
Other consumer | Consumer loans | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Retail Branches Sold
Accounts, Notes, Loans and Financing Receivable [Line Items]
Sales of loans held for sale				$ 84
Other Income (Loss)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Revenue (losses) associated with the economic hedging program		0	$ 3		$ 0	$ 7
Other Income (Loss) | Commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Lower of amortized cost or fair value		$ 34

[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