Related Party Transactions - Summary of Related Party Transactions (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011	Dec. 31, 2010
Assets:
Cash and due from banks	$ 961		$ 1,359		$ 1,616	$ 1,693	[1]
Interest bearing deposits with banks	19,614		13,279
Trading assets	28,894		30,874
Loans	67,695		63,258		51,867
Other	8,140		7,069
Total assets	185,487	[2]	191,446	[2]
Liabilities:
Deposits	112,608		117,671		139,729
Trading liabilities	10,875		14,699
Short-term borrowings	19,135		14,933
Long-term debt	22,847		21,745
Other	3,558		4,562
Total liabilities	169,023	[2]	173,610	[2]
Parent And Other Subsidiaries Of Common Parent [Member]
Assets:
Cash and due from banks	102		114
Interest bearing deposits with banks	631	[3]	714	[3]
Trading assets	17,082	[4]	21,370	[4]
Loans	5,328		4,514
Other	1,219	[5]	858	[5]
Total assets	24,362		27,570
Liabilities:
Deposits	16,936		13,863
Trading liabilities	19,463	[4]	23,910	[4]
Short-term borrowings	1,514		2,721
Long-term debt	3,987		3,990
Other	573	[5]	459	[5]
Total liabilities	$ 42,473		$ 44,943

[1] Cash at beginning of period includes $117 million for discontinued operations as of January 1, 2011.

[2] The following table summarizes assets and liabilities related to our consolidated variable interest entities (“VIEs”) as of December 31, 2013 and December 31, 2012 which are consolidated on our balance sheet. Assets and liabilities exclude intercompany balances that eliminate in consolidation. Assets: Interest bearing deposits with banks, $5 million and $0 million, Securities held-to-maturity, $200 million and $0 million Other assets $502 million and $533 million. Total assets $707 million and $533 million respectively. Liabilities: Long-term debt $92 million and $92 million, Interest, taxes and other liabilities $93 million and $152 million. Total liabilities $185 million and $244 million, respectively.

[3] Includes interest bearing deposits with HSBC Mexico S.A. of $500 million at both December 31, 2013 and 2012, respectively.

[4] Trading assets and liabilities do not reflect the impact of netting which allows the offsetting of amounts relating to certain contracts if certain conditions are met. Trading assets and liabilities primarily consist of derivatives contracts.

[5] Other assets and other liabilities primarily consist of derivative contracts.