Related Party Transactions - Summary of Related Party Transactions (Details) - USD ($) $ in Millions		Jun. 30, 2020		Dec. 31, 2019		Jun. 30, 2019
Assets:
Cash and due from banks		$ 1,266		$ 1,744
Interest bearing deposits with banks		17,734		2,038
Securities purchased under agreements to resell		29,255		17,838
Trading assets		32,409		28,452
Loans		72,468		68,553
Other		6,866		6,723
Total assets		212,862	[1]	175,375	[1]	$ 184,063
Liabilities:
Deposits		156,033		119,693		$ 116,961
Trading liabilities		3,218		3,235
Short-term borrowings		6,102		3,659
Long-term debt		25,746		26,697
Other		3,619		3,835
Total liabilities	[1]	194,718		157,119
Affiliated Entity [Member]
Assets:
Cash and due from banks		466		850
Interest bearing deposits with banks		135		40
Securities purchased under agreements to resell	[2]	2,153		4,600
Trading assets		86		79
Loans		1,565		2,343
Other	[2]	863		456
Total assets		5,268		8,368
Liabilities:
Deposits		15,790		9,000
Trading liabilities		53		293
Short-term borrowings		295		1,166
Long-term debt		4,865		7,848
Other	[2]	210		931
Total liabilities		$ 21,213		$ 19,238

[1] The following table summarizes assets and liabilities related to our consolidated variable interest entities ("VIEs") at June 30, 2020 and December 31, 2019 which are consolidated on our balance sheet. Assets and liabilities exclude intercompany balances that eliminate in consolidation. See Note 17, "Variable Interest Entities," for additional information. Assets: Loans $39 million and $0 million. Other assets $86 million and $98 million. Total assets $125 million and $98 million respectively. Liabilities: Interest, taxes and other liabilities $23 million and $38 million. Total liabilities $23 million and $38 million, respectively.

[2] Other assets and other liabilities primarily consist of derivative balances associated with hedging activities and other miscellaneous account receivables and payables.