Branch Assets and Liabilities Held for Sale - Narrative (Details) $ in Millions		1 Months Ended		3 Months Ended			9 Months Ended
		Feb. 28, 2022 USD ($) branch	May 31, 2021 branch	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Jun. 30, 2021 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)
Restructuring Cost and Reserve [Line Items]
Gain on sale of branch disposal group, net				$ 2	$ 0		$ 113	$ 0
Loans held for sale	[1]			576			576		$ 4,217
Deposits held for sale	[1]			0			$ 0		8,750
Retail Branches Sold
Restructuring Cost and Reserve [Line Items]
Loans held for sale									$ 2,441
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		$ 2
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
Reduction to the provision for credit losses						$ 101
Exit of Mass Market Retail Banking Business | Consumer loans
Restructuring Cost and Reserve [Line Items]
Reduction to the provision for credit losses						$ 100
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 September 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. September 30, 2022December 31, 2021(in millions)AssetsLoans$127 $46 Other assets44 55 Total assets$171 $101 LiabilitiesInterest, taxes and other liabilities$26 $9 Total liabilities$26 $9