Loans - Consumer, Excluding Credit Card Loans, Loan Modifications, Nature and Extend of Modifications (Details) (Consumer, excluding credit card)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Home Equity - Senior Lien
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concession granted - Interest rate reduction	43.00%	68.00%	56.00%	71.00%
Concession granted - Term of payment extension	53.00%	77.00%	71.00%	74.00%
Concession granted - Principal and/or interest deferred	10.00%	16.00%	12.00%	12.00%
Concession granted - principal forgiveness	50.00%	40.00%	38.00%	39.00%
Concession granted - other	0.00%	0.00%	0.00%	0.00%
Home Equity - Junior Lien
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concession granted - Interest rate reduction	84.00%	90.00%	85.00%	88.00%
Concession granted - Term of payment extension	84.00%	80.00%	83.00%	78.00%
Concession granted - Principal and/or interest deferred	22.00%	21.00%	22.00%	23.00%
Concession granted - principal forgiveness	20.00%	36.00%	26.00%	36.00%
Concession granted - other	0.00%	0.00%	0.00%	0.00%
Prime Mortgages, Including Option ARMs
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concession granted - Interest rate reduction	23.00%	72.00%	40.00%	73.00%
Concession granted - Term of payment extension	18.00%	77.00%	46.00%	71.00%
Concession granted - Principal and/or interest deferred	7.00%	35.00%	17.00%	30.00%
Concession granted - principal forgiveness	73.00%	33.00%	54.00%	38.00%
Concession granted - other	4.00%	22.00%	9.00%	24.00%
Subprime Mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concession granted - Interest rate reduction	26.00%	73.00%	43.00%	71.00%
Concession granted - Term of payment extension	29.00%	60.00%	49.00%	54.00%
Concession granted - Principal and/or interest deferred	6.00%	17.00%	11.00%	13.00%
Concession granted - principal forgiveness	72.00%	45.00%	57.00%	50.00%
Concession granted - other	7.00%	14.00%	9.00%	14.00%
Residential Real Estate, Excluding Purchased Credit-Impaired
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concession granted - Interest rate reduction	36.00%	77.00%	56.00%	77.00%
Concession granted - Term of payment extension	36.00%	72.00%	60.00%	67.00%
Concession granted - Principal and/or interest deferred	9.00%	23.00%	16.00%	20.00%
Concession granted - principal forgiveness	62.00%	39.00%	45.00%	42.00%
Concession granted - other	4.00%	11.00%	6.00%	11.00%
Percentage, sum of items by type, may exceed			100.00%
Trial Modification | Home Equity - Senior Lien
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of contract modifications	232	347	651	1,409
Trial Modification | Home Equity - Junior Lien
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of contract modifications	164	146	505	514
Trial Modification | Prime Mortgages, Including Option ARMs
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of contract modifications	274	584	790	2,416
Trial Modification | Subprime Mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of contract modifications	502	960	1,530	3,572
Trial Modification | Residential Real Estate, Excluding Purchased Credit-Impaired
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of contract modifications	1,172	2,037	3,476	7,911
Permanent Modification | Home Equity - Senior Lien
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of contract modifications	333	410	854	1,360
Permanent Modification | Home Equity - Junior Lien
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of contract modifications	581	1,012	2,238	3,681
Permanent Modification | Prime Mortgages, Including Option ARMs
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of contract modifications	1,267	1,046	2,184	3,659
Permanent Modification | Subprime Mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of contract modifications	1,420	1,200	2,680	4,347
Permanent Modification | Residential Real Estate, Excluding Purchased Credit-Impaired
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of contract modifications	3,601	3,668	7,956	13,047
Regulatory Guidance Regarding Chapter 7 Loans | Home Equity - Senior Lien
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of loans			8,200
Regulatory Guidance Regarding Chapter 7 Loans | Home Equity - Junior Lien
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of loans			20,900
Regulatory Guidance Regarding Chapter 7 Loans | Prime Mortgages, Including Option ARMs
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of loans			2,800
Regulatory Guidance Regarding Chapter 7 Loans | Subprime Mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of loans			2,100
Regulatory Guidance Regarding Chapter 7 Loans | Residential Real Estate, Excluding Purchased Credit-Impaired
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of loans			34,000