Loans Held for Sale - Additional Information (Details) - USD ($) $ in Millions		3 Months Ended			6 Months Ended
		Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Feb. 28, 2022	Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held for sale	[1]	$ 489			$ 489			$ 4,217
Commercial loans held-for-sale		194			194			48
Revenue (losses) associated with the economic hedging program		(977)		$ 435	(1,442)	$ 802
Commercial loans held for sale
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loans held-for-sale		172			172			23
Retail Branches Sold
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held for sale								2,441
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		373			373			461
Valuation allowance		1			1			5
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		116			116			3,756
Transfer of loans held-for-sale to held-for-investment		538
Valuation allowance		13			13			7
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
Loss on sale of loans			(35)
Loans Transferred From Portfolio Loans to Held For Sale | Commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held for sale		201			201			359
Residential mortgages | Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held for sale		12			12			3,082
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
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held for sale		0			0			275
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
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held for sale		8			8			195
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
Credit cards | Consumer loans | Exit of Mass Market Retail Banking Business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held for sale		8			8
Student loans held for sale | Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, designated under fair value option		22			22
Other consumer | Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held for sale		96			96			204
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 consumer | Consumer loans | Exit of Mass Market Retail Banking Business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held for sale		96			96
Global banking | Commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held for sale		366			366			$ 338
Global banking | Commercial loans | 2020 - 2021 Restructuring Plan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans sold		44
Loss on sale of loans		(3)
Other Income (Loss)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Revenue (losses) associated with the economic hedging program		$ 3		$ (3)	$ 7	$ (1)

[1] The following table summarizes assets and liabilities related to our consolidated variable interest entities ("VIEs") at June 30, 2022 and December 31, 2021. Assets and liabilities exclude intercompany balances that eliminate in consolidation. See Note 17, "Variable Interest Entities," for additional information. June 30, 2022December 31, 2021(in millions)AssetsLoans$118 $46 Other assets46 55 Total assets$164 $101 LiabilitiesInterest, taxes and other liabilities$28 $9 Total liabilities$28 $9