Loans - Consumer, Excluding Credit Card Loans, Loan Modifications, New TDRs (Details) (Consumer, excluding credit card, USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Residential real estate – excluding PCI
Financing Receivable, Impaired [Line Items]
New TDRs	$ 732	$ 1,687	$ 5,507
Home equity - senior lien
Financing Receivable, Impaired [Line Items]
New TDRs	110	210	835
Home equity - junior lien
Financing Receivable, Impaired [Line Items]
New TDRs	211	388	711
Mortgages - prime, including option ARMS
Financing Receivable, Impaired [Line Items]
New TDRs	287	770	2,918
Mortgages - subprime
Financing Receivable, Impaired [Line Items]
New TDRs	$ 124	$ 319	$ 1,043