Loans Held for Sale - Additional Information (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2022	Mar. 31, 2021	Feb. 28, 2022	Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held for sale	[1]	$ 948			$ 4,217
Revenue (losses) associated with the economic hedging program		(465)	$ 367
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		211			461
Valuation allowance		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		737			3,756
Valuation allowance		5			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 and Remaining Retail Credit Card Portfolio
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held for sale		707
Sales of loans held for sale		904
Gain on sale of loans		35
Commercial Loans - Transferred to Held for Sale | Commercial loans:
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held for sale		91			359
Commercial Loans - Fair Value Option | Commercial loans:
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held for sale		120			23
Residential mortgages | Consumer loans:
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held for sale		568			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 and Remaining Retail Credit Card Portfolio
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held for sale		538
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		47			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 and Remaining Retail Credit Card Portfolio
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held for sale		47
Sales of loans held for sale		39
Credit cards | Consumer loans:
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held for sale		17			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 and Remaining Retail Credit Card Portfolio
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held for sale		17
Student loans held for sale | Consumer loans:
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, designated under fair value option		24
Other consumer | Consumer loans:
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held for sale		105			$ 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 and Remaining Retail Credit Card Portfolio
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held for sale		105
Residential mortgage banking revenue (expense)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Revenue (losses) associated with the economic hedging program		$ 4	$ 2

[1] The following table summarizes assets and liabilities related to our consolidated variable interest entities ("VIEs") at March 31, 2022 and December 31, 2021. Assets and liabilities exclude intercompany balances that eliminate in consolidation. See Note 17, "Variable Interest Entities," for additional information. March 31, 2022December 31, 2021(in millions)AssetsLoans$128 $46 Other assets51 55 Total assets$179 $101 LiabilitiesInterest, taxes and other liabilities$31 $9 Total liabilities$31 $9