Transfers and Servicing of Mortgage Loans (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended	12 Months Ended
Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Activity in capitalized MSRs
Balance, beginning of period			$ 1,022	$ 1,209	$ 1,209
Additions			209	244
Changes in fair value due to:
Realization of expected cash flows			(220)	(199)
Changes in market inputs or assumptions used in the valuation model			226	(252)
Balance, end of period	1,237	1,002	1,237	1,002	1,022
Contractually specified servicing fees, late fees and other ancillary servicing revenue were recorded within Loan servicing income as follows:
Servicing fees from capitalized portfolio	95	106	294	329
Late fees	5	5	14	15
Other ancillary servicing revenue	12	10	31	30
Weighted average life of MSRs			5 years 9 months 18 days		4 years 3 months 18 days
Cash flows relating to loan sales in which the Company has continuing involvement
Proceeds from new loan sales or securitizations			19,401	25,895
Servicing fees from capitalized portfolio	95	106	294	329
Other cash flows on retained interests				5
Purchases of delinquent or foreclosed loans			(50)	(70)
Servicing advances			(1,003)	(975)
Repayment of servicing advances			946	942
Realized Gain Loss on Sale
Pre-tax gains related to sale or securitization of residential mortgage loans	214	263	642	689
Mortgage servicing advances
Advance receivables
Outstanding servicing advance receivables	$ 536		$ 536		$ 293

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Weighted average life of financial assets and financial liabilities, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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