Mortgage Servicing Rights (Details 1) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2011 Loans Basis_Points Multiple Year	Sep. 30, 2010	Sep. 30, 2011 Loans Basis_Points Multiple Year	Sep. 30, 2010	Jun. 30, 2011	Dec. 31, 2010 Year Basis_Points Multiple	Jun. 30, 2010	Dec. 31, 2009
MSRs and related characteristics by portfolio
Servicing portfolio	$ 185,555,000,000		$ 185,555,000,000			$ 173,919,000,000
Fair market value	1,466,000,000	1,422,000,000	1,466,000,000	1,422,000,000	1,989,000,000	1,837,000,000	1,543,000,000	1,749,000,000
Value (bps)	79		79			106
Weighted-average servicing fees (bps)	31		31			32
Multiple (value/servicing fees)	2.55		2.55			3.31
Weighted-average note rate	5.11%		5.11%			5.32%
Age (in years)	2.8		2.8			2.7
Expected prepayment (constant prepayment rate)	21.50%		21.50%			16.10%
Expected life (in years)	4.0		4.0			5.4
Discount rate	10.50%		10.50%			10.60%
Mortgage Servicing Rights (Textual) [Abstract]
Company serviced residential mortgage loan for others	185,600,000,000		185,600,000,000			173,900,000,000
Gain/Loss on the fair value of mortgage servicing rights and fair value changes of derivatives used to offset MSR	7,000,000	1,000,000	151,000,000	98,000,000
Loan servicing fees	166,000,000	154,000,000	483,000,000	439,000,000
MRBP [Member]
MSRs and related characteristics by portfolio
Servicing portfolio	13,247,000,000		13,247,000,000			12,646,000,000
Fair market value	163,000,000		163,000,000			166,000,000
Value (bps)	123		123			131
Weighted-average servicing fees (bps)	40		40			40
Multiple (value/servicing fees)	3.08		3.08			3.28
Weighted-average note rate	5.56%		5.56%			5.75%
Age (in years)	4.2		4.2			4.1
Expected prepayment (constant prepayment rate)	12.50%		12.50%			12.30%
Expected life (in years)	6.6		6.6			6.7
Discount rate	11.90%		11.90%			11.90%
Government [Member]
MSRs and related characteristics by portfolio
Servicing portfolio	32,055,000,000		32,055,000,000			28,880,000,000
Fair market value	274,000,000		274,000,000			342,000,000
Value (bps)	85		85			118
Weighted-average servicing fees (bps)	36		36			38
Multiple (value/servicing fees)	2.36		2.36			3.11
Weighted-average note rate	5.16%		5.16%			5.35%
Age (in years)	2.4		2.4			2.2
Expected prepayment (constant prepayment rate)	22.70%		22.70%			17.20%
Expected life (in years)	3.7		3.7			5.1
Discount rate	11.20%		11.20%			11.40%
Conventional Loan [Member]
MSRs and related characteristics by portfolio
Servicing portfolio	140,253,000,000		140,253,000,000			132,393,000,000
Fair market value	$ 1,029,000,000		$ 1,029,000,000			$ 1,329,000,000
Value (bps)	73		73			100
Weighted-average servicing fees (bps)	29		29			30
Multiple (value/servicing fees)	2.52		2.52			3.33
Weighted-average note rate	5.05%		5.05%			5.27%
Age (in years)	2.7		2.7			2.7
Expected prepayment (constant prepayment rate)	22.10%		22.10%			16.20%
Expected life (in years)	3.8		3.8			5.3
Discount rate	10.20%		10.20%			10.30%