Loans - By Portfolio Segment (Details) (USD $)						12 Months Ended																	12 Months Ended						12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 Consumer, excluding credit card [Member]	Dec. 31, 2012 Consumer, excluding credit card [Member]	Dec. 31, 2013 Residential mortgage [Member]	Dec. 31, 2013 Days Past Due, 90 or More [Member] Consumer, excluding credit card [Member]	Dec. 31, 2013 Days Past Due, 30 or More [Member] Consumer, excluding credit card [Member]	Dec. 31, 2013 Current, and Less Than 90 Days Past Due [Member] Consumer, excluding credit card [Member]	Dec. 31, 2013 Days Past Due, 180 or More [Member] Residential Real Estate, Non-Modified Credit Card and Scored Business Banking Loans [Member]	Dec. 31, 2013 Days Past Due, 120 or More [Member] Auto and Student Loans [Member]	Dec. 31, 2013 Days Past Due, 60 or More, or Sooner with Determination of Collateral Dependence [Member] Residential Real Estate and Auto Loans [Member]	Dec. 31, 2013 Days Until Charge-Off, Less Than 60, with Notification of Bankruptcy Filing or Other Event [Member] Credit Card and Scored Business Banking Loans [Member]	Dec. 31, 2013 Days Past Due, 60 or More, with Notification of Bankruptcy Filing or Other Event [Member] Student Loans [Member]	Dec. 31, 2013 Financing Receivable, Policy, Current [Member] Days Past Due, 120 or More [Member] Consumer Credit Card Financing Receivable [Member]	Dec. 31, 2013 Financing Receivable, Policy, Previous [Member] Days Past Due, 180 or More [Member] Consumer Credit Card Financing Receivable [Member]	Dec. 31, 2013 Maximum [Member] Residential mortgage [Member]	Dec. 31, 2013 Maximum [Member] Real estate [Member]	Dec. 31, 2013 Minimum [Member] Real estate [Member]	Dec. 31, 2013 Consumer, excluding credit card [Member]	Dec. 31, 2012 Consumer, excluding credit card [Member]	Dec. 31, 2011 Consumer, excluding credit card [Member]	Dec. 31, 2013 Consumer, excluding credit card [Member] Minimum [Member] loan_payment	Dec. 31, 2013 Credit card [Member]	Dec. 31, 2012 Credit card [Member]	Dec. 31, 2011 Credit card [Member]	Dec. 31, 2013 Credit card [Member] Consumer Credit Card Financing Receivable [Member]	Dec. 31, 2012 Credit card [Member] Consumer Credit Card Financing Receivable [Member]	Dec. 31, 2013 Credit card [Member] Days Past Due, 90 or More [Member] Consumer Credit Card Financing Receivable [Member]	Dec. 31, 2013 Credit card [Member] Days Past Due, 30 or More [Member] Consumer Credit Card Financing Receivable [Member]	Dec. 31, 2013 Wholesale-related [Member]	Dec. 31, 2012 Wholesale-related [Member]	Dec. 31, 2011 Wholesale-related [Member]	Dec. 31, 2013 Wholesale-related [Member] Real estate [Member]	Dec. 31, 2012 Wholesale-related [Member] Real estate [Member]
Loans and Leases Receivable Disclosure [Line Items]
Period past due, credit analysis factors, charge off criteria							90 days	30 days	90 days			60 days	60 days	60 days
Loans, charge-off criteria, period pas due										180 days	120 days				120 days	180 days													90 days	30 days
Number of months before updating exterior opinion on home valuation																	6 months
Number of months before updating collateral values on commercial real estate loans																		12 months	6 months
Number of months the borrower has performed under modified terms						6 months
Number of payments under modified terms to recognize interest on cash basis																							6
Loan balances by portfolio segment:
Total retained loans	$ 724,177,000,000	$ 726,835,000,000	$ 718,997,000,000																	$ 288,449,000,000	$ 292,620,000,000	$ 308,427,000,000		$ 127,465,000,000	$ 127,993,000,000	$ 132,175,000,000	$ 127,465,000,000	$ 127,993,000,000			$ 308,263,000,000	$ 306,222,000,000	$ 278,395,000,000	$ 69,151,000,000	$ 60,740,000,000
Held-for-sale	12,230,000,000	4,406,000,000																		614,000,000	0			326,000,000	0						11,290,000,000	4,406,000,000
At fair value	2,011,000,000	2,555,000,000																		0	0			0	0						2,011,000,000	2,555,000,000
Loans	738,418,000,000	733,796,000,000		289,063,000,000	292,620,000,000															289,063,000,000	292,620,000,000			127,791,000,000	127,993,000,000						321,564,000,000	313,183,000,000
Loans and leases receivable deferred costs	$ 1,900,000,000	$ 2,500,000,000