Branch Assets and Liabilities Held for Sale - Narrative (Details) $ in Millions		1 Months Ended		3 Months Ended
		Feb. 28, 2022 USD ($)	May 31, 2021 branch	Mar. 31, 2022 USD ($)	Mar. 31, 2021 USD ($)	Dec. 31, 2021 USD ($)
Restructuring Cost and Reserve [Line Items]
Gain on sale of branch disposal group, net				$ 111	$ 0
Loans held for sale	[1]			948		$ 4,217
Deposits held for sale				$ 0		8,750	[1]
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
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
Minimum | Rebranding of Retail Branches
Restructuring Cost and Reserve [Line Items]
Number of bank branches | branch			20
Maximum | Rebranding of Retail Branches
Restructuring Cost and Reserve [Line Items]
Number of bank branches | branch			25

[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