Related Party Transactions - Summary of Related Party Transactions (Details) - USD ($) $ in Millions		Jun. 30, 2019		Dec. 31, 2018		Jun. 30, 2018
Assets:
Cash and due from banks		$ 1,196		$ 1,514
Interest bearing deposits with banks		11,736		15,700
Trading assets		33,502		21,978
Loans		72,478		68,978		$ 66,399
Other		7,342		6,325
Total assets		184,063	[1]	172,448	[1]	180,687
Liabilities:
Deposits		116,961		110,955		114,355
Trading liabilities		4,026		3,643
Short-term borrowings		8,649		4,180
Long-term debt		30,849		30,628
Other		4,944		2,536
Total liabilities	[1]	165,429		151,942
Affiliated Entity [Member]
Assets:
Cash and due from banks		250		245
Interest bearing deposits with banks		790		1,000
Trading assets		298		102
Loans		3,096		2,274		$ 1,895
Other		289		169
Total assets		4,723		3,790
Liabilities:
Deposits		13,301		12,000
Trading liabilities		157		349
Short-term borrowings		1,518		638
Long-term debt		7,847		7,845
Other	[2]	392		333
Total liabilities		$ 23,215		$ 21,165

[1] The following table summarizes assets and liabilities related to our consolidated variable interest entities ("VIEs") at June 30, 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 $66 million and $66 million, Interest, taxes and other liabilities $32 million and $37 million. Total liabilities $98 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.