Transfers and Servicing of Mortgage Loans (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended	12 Months Ended
Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Activity in capitalized MSRs
Balance, beginning of period			$ 1,022	$ 1,209	$ 1,209
Additions			145	174
Changes in fair value due to:
Realization of expected cash flows			(157)	(124)
Changes in market inputs or assumptions used in the valuation model			237	(102)
Balance, end of period	1,247	1,157	1,247	1,157	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	99	111	199	223
Late fees	4	5	9	10
Other ancillary servicing revenue	9	8	19	20
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			13,805	18,149
Servicing fees from capitalized portfolio	99	111	199	223
Other cash flows on retained interests				5
Purchases of delinquent or foreclosed loans			(37)	(42)
Servicing advances			(562)	(651)
Repayment of servicing advances			569	642
Realized Gain Loss on Sale
Pre-tax gains related to sale or securitization of residential mortgage loans	186	198	428	426
Mortgage servicing advances
Advance receivables
Outstanding servicing advance receivables	$ 477		$ 477		$ 293

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