Related Party Transactions - Summary of Related Party Transactions (Details) - USD ($) $ in Millions		Sep. 30, 2024		Dec. 31, 2023		Sep. 30, 2023
Assets:
Cash and due from banks	[1]	$ 725		$ 704
Interest bearing deposits with banks	[1]	28,334		25,015
Securities purchased under agreements to resell	[1]	4,310		13,878
Trading assets	[1]	21,707		22,115
Loans, net		61,467	[1]	58,396	[1]	$ 57,016
Other	[1]	6,804		6,490
Total assets		167,799	[1]	168,238	[1]	164,357
Liabilities:
Deposits		123,373	[1]	121,283	[1]	$ 119,928
Trading liabilities	[1]	2,837		3,485
Short-term borrowings	[1]	7,653		9,914
Long-term debt	[1]	18,410		18,661
Other	[1]	3,140		3,256
Total liabilities	[1]	155,413		156,599
Related Party
Assets:
Cash and due from banks		205		133
Interest bearing deposits with banks		37		90
Securities purchased under agreements to resell		769		406
Trading assets		84		57
Loans, net		3,784		2,618
Other		459		491
Total assets		5,338		3,795
Liabilities:
Deposits		10,167		9,110
Trading liabilities		283		321
Short-term borrowings		1,342		1,014
Long-term debt		6,747		6,511
Other		272		331
Total liabilities		$ 18,811		$ 17,287

[1] The following table summarizes assets and liabilities related to our consolidated variable interest entities ("VIEs") at September 30, 2024 and December 31, 2023. Assets and liabilities exclude intercompany balances that eliminate in consolidation. See Note 15, "Variable Interest Entities," for additional information. September 30, 2024December 31, 2023(in millions)AssetsOther assets$13 $23 Total assets$13 $23 LiabilitiesInterest, taxes and other liabilities$21 $17 Total liabilities$21 $17