Loan Sale and Servicing Activities and Variable Interest Entities (Certain Financial Information and Cash Flows Associated with Loan Sale and Servicing Activities) (Details) (USD $)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Residential Mortgages [Member]
Servicing portfolio	$ 110,749,000,000		$ 110,749,000,000		$ 113,994,000,000
Carrying value of servicing assets	978,000,000		978,000,000		1,087,000,000
Servicing advances	486,000,000		486,000,000		571,000,000
Repurchase and recourse obligations	108,000,000		108,000,000		131,000,000
Carrying value of mortgage-backed securities held	3,514,000,000		3,514,000,000		4,144,000,000
Cash flows from sales of loans	2,153,000,000	4,148,000,000	6,437,000,000	12,142,000,000
Cash flows from repurchases of previously transferred loans	188,000,000	278,000,000	556,000,000	928,000,000
Cash flows from servicing fees	86,000,000	91,000,000	260,000,000	270,000,000
Cash flows from servicing advances recovered	15,000,000		84,000,000	24,000,000
Cash flows on mortgage-backed securities held	238,000,000	436,000,000	724,000,000	1,192,000,000
Commercial Mortgages [Member]
Servicing portfolio	179,148,000,000		179,148,000,000		176,510,000,000
Carrying value of servicing assets	532,000,000		532,000,000		549,000,000
Servicing advances	318,000,000		318,000,000		412,000,000
Repurchase and recourse obligations	36,000,000		36,000,000		33,000,000
Carrying value of mortgage-backed securities held	1,189,000,000		1,189,000,000		1,475,000,000
Cash flows from sales of loans	1,091,000,000	712,000,000	2,026,000,000	2,127,000,000
Cash flows from servicing fees	34,000,000	44,000,000	101,000,000	133,000,000
Cash flows from servicing advances recovered	38,000,000	78,000,000	93,000,000	81,000,000
Cash flows on mortgage-backed securities held	51,000,000	140,000,000	242,000,000	333,000,000
Home Equity Loans Lines [Member]
Servicing portfolio	3,936,000,000		3,936,000,000		4,321,000,000
Servicing advances	4,000,000		4,000,000		11,000,000
Repurchase and recourse obligations	24,000,000		24,000,000		22,000,000
Cash flows from repurchases of previously transferred loans	4,000,000	1,000,000	13,000,000	5,000,000
Cash flows from servicing fees	4,000,000	5,000,000	14,000,000	16,000,000
Cash flows from servicing advances recovered			6,000,000
Cash flows from servicing advances (funded)		(5,000,000)		(6,000,000)
Quantifying Misstatement In Current Year Financial Statements Amount					$ (581,000,000)