Loans Held for Sale (Details) - USD ($) $ in Millions		Dec. 31, 2021	Jun. 30, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held for sale	[1]	$ 4,217		$ 337
Credit cards
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held for sale			$ 1,100
Commercial loans:
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held for sale		461		129
Commercial loans: | Real Estate, including Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held for sale		0		10
Commercial loans: | Business and corporate banking
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held for sale		123		0
Commercial loans: | Global banking
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held for sale		338		119
Consumer loans:
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held for sale		3,756		208
Consumer loans: | Residential Mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held for sale		3,082		208
Consumer loans: | Home Equity Mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held for sale		275		0
Consumer loans: | Credit cards
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held for sale		195		0
Consumer loans: | Other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held for sale		$ 204		$ 0

[1] The following table summarizes assets and liabilities related to our consolidated variable interest entities ("VIEs") at December 31, 2021 and 2020. Assets and liabilities exclude intercompany balances that eliminate in consolidation. See Note 27, "Variable Interest Entities," for additional information. At December 31,20212020(in millions)AssetsLoans$46 $10 Other assets55 79 Total assets$101 $89 LiabilitiesInterest, taxes and other liabilities$9 $10 Total liabilities$9 $10