Loans Held for Sale - Additional Information (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial leveraged acquisition finance loans	$ 3	$ 465
Loans held for sale	230	1,018
Fair value of commercial real estate loans held for sale	18	16
Residential mortgage loans held for sale include subprime residential mortgage loans at fair value	46	52
Valuation allowance on loans held for sale	606	647	743	852
Commercial Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for sale	76	481
Consumer Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for sale	154	537
Valuation allowance on loans held for sale	77	114
Commercial Loans - Global Banking Project Finance Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for sale	$ 55