Loan Sale and Servicing Activities and Variable Interest Entities (Principal Balance, Delinquent Loans (Loans 90 Days or More Past Due), and Net Charge-Offs Related to Serviced Loans) (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]
Total principal balance	$ 80,887,000,000		$ 80,887,000,000		$ 85,758,000,000
Delinquent loans	2,859,000,000		2,859,000,000		3,562,000,000
Net charge-offs	33,000,000	58,000,000	108,000,000	173,000,000
Commercial Mortgages [Member]
Total principal balance	60,935,000,000		60,935,000,000		62,872,000,000
Delinquent loans	2,525,000,000		2,525,000,000		2,353,000,000
Net charge-offs	439,000,000	431,000,000	1,139,000,000	729,000,000
Home Equity Loans Lines [Member]
Total principal balance	3,936,000,000		3,936,000,000		4,321,000,000
Delinquent loans	1,312,000,000		1,312,000,000		1,404,000,000
Net charge-offs	15,000,000	24,000,000	47,000,000	103,000,000
Quantifying Misstatement In Current Year Financial Statements Amount					$ (581,000,000)