Related Party Transactions - Summary of Loans (Details) - USD ($) $ in Millions		Jun. 30, 2023	Dec. 31, 2022
Related Party Transaction [Line Items]
Loans, net	[1]	$ 57,945	$ 59,380
HMUS and subsidiaries | Loans And Lines Of Credit
Related Party Transaction [Line Items]
Loans, net		1,495	2,243
HSBC North America | Loans And Lines Of Credit
Related Party Transaction [Line Items]
Loans, net		1,550	1,250
Other short-term affiliate lending | Loans And Lines Of Credit
Related Party Transaction [Line Items]
Loans, net		0	0
Other short-term affiliate lending | Short Term Lending
Related Party Transaction [Line Items]
Loans, net		22	64
Related Party
Related Party Transaction [Line Items]
Loans, net		$ 3,067	$ 3,557

[1] The following table summarizes assets and liabilities related to our consolidated variable interest entities ("VIEs") at June 30, 2023 and December 31, 2022. Assets and liabilities exclude intercompany balances that eliminate in consolidation. See Note 17, "Variable Interest Entities," for additional information. June 30, 2023December 31, 2022(in millions)AssetsLoans, net$186 $162 Other assets40 44 Total assets$226 $206 LiabilitiesInterest, taxes and other liabilities$35 $22 Total liabilities$35 $22