Related Party Transactions - Summary of Related Party Transactions (Details) - USD ($) $ in Millions		Dec. 31, 2019		Dec. 31, 2018		Dec. 31, 2017
Assets:
Cash and due from banks		$ 1,744		$ 1,514
Interest bearing deposits with banks		2,038		15,700
Securities purchased under agreements to resell		17,838		10,168
Trading assets		28,452		21,978
Loans		68,553		68,978		$ 72,563
Other		6,723		6,325
Total assets		175,375	[1]	172,448	[1]	187,235
Liabilities:
Deposits		119,693		110,955		118,702
Trading liabilities		3,235		3,643
Short-term borrowings		3,659		4,180		$ 4,650
Long-term debt		26,697		30,628
Other		3,835		2,536
Total liabilities	[1]	157,119		151,942
Affiliated Entity [Member]
Assets:
Cash and due from banks		850		245
Interest bearing deposits with banks		40		1,000
Securities purchased under agreements to resell	[2]	4,600		0
Trading assets		79		102
Loans		2,343		2,274
Other	[2]	456		169
Total assets		8,368		3,790
Liabilities:
Deposits		9,000		12,000
Trading liabilities		293		349
Short-term borrowings		1,166		638
Long-term debt		7,848		7,845
Other	[2]	931		333
Total liabilities		$ 19,238		$ 21,165

[1] The following table summarizes assets and liabilities related to our consolidated variable interest entities ("VIEs") at December 31, 2019 and December 31, 2018 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: Other assets $98 million and $112 million. Total assets $98 million and $112 million respectively. Liabilities: Long-term debt $0 million and $66 million, Interest, taxes and other liabilities $38 million and $37 million. Total liabilities $38 million and $103 million, respectively.

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