Fair Value Measurements (Details Textual) (USD $)	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011 Entity	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Mar. 31, 2011
Fair Value Measurements (Textual) [Abstract]
Loans in Portfolio	$ 73,000,000
Nonexit price methodology for valuing loan portfolio				0.40%
Loans, net of allowance	48,717,000,000	46,610,000,000		48,571,000,000
Loans held for sale	656,000,000	381,000,000	511,000,000	728,000,000	479,000,000	426,000,000
Notice Period to redeem quarterly investments (in days)	45 days
Transfer of commercial and consumer loans from held-for-sale to held-to-maturity, current fair value	38,000,000
Average maturity of short term financial instrument	less than six months
Fair Value Measurements (Additional Textual) [Abstract]
Period for evaluation of fair value of property	90 days
Number of independent entities		2
Passive funds [Member]
Fair Value Estimate Not Practicable (Textual) [Abstract]
Liquidation period of funds, minimum (in years)	1 year
Liquidation period of funds, maximum (in years)	7 years
Private equity funds [Member]
Fair Value Estimate Not Practicable (Textual) [Abstract]
Liquidation period of funds, minimum (in years)	1 year
Liquidation period of funds, maximum (in years)	10 years
Co-managed funds [Member]
Fair Value Estimate Not Practicable (Textual) [Abstract]
Maturity Period of funds, minimum (in Years)	2 years
Maturity Period of funds, maximum (in Years)	5 years
Segment, Discontinued Operations [Member]
Fair Value Measurements (Textual) [Abstract]
Loans, net of allowance	5,404,000,000	6,152,000,000		5,708,000,000
Segment, Discontinued Operations [Member] | Education Lending [Member]
Fair Value Measurements (Textual) [Abstract]
Loans in Portfolio	73,000,000			76,000,000
Loans, net of allowance	5,404,000,000	6,152,000,000		5,708,000,000
Residential Real Estate Mortgage Loans [Member]
Fair Value Measurements (Textual) [Abstract]
Loans, net of allowance	2,000,000,000			1,900,000,000
Carrying Amount [Member]
Fair Value Measurements (Textual) [Abstract]
Commercial loan portfolios held-for-sale	656,000,000			728,000,000
Carrying Amount [Member] | Segment, Discontinued Operations [Member] | Education Lending [Member]
Fair Value Measurements (Textual) [Abstract]
Loans, net of allowance	2,800,000,000			2,900,000,000
Loans held for sale	0
Fair Value [Member]
Fair Value Measurements (Textual) [Abstract]
Commercial loan portfolios held-for-sale	656,000,000			728,000,000
Fair Value [Member] | Segment, Discontinued Operations [Member] | Education Lending [Member]
Fair Value Measurements (Textual) [Abstract]
Loans in the trusts	2,600,000,000			2,700,000,000
Securities issued by the education lending securitization trust	2,400,000,000			2,500,000,000
Loans, net of allowance	2,400,000,000			2,500,000,000
Level 3 [Member] | Commercial Loan [Member]
Fair Value Measurements (Textual) [Abstract]
Commercial loan portfolios held-for-sale	15,000,000			15,000,000
Level 3 [Member] | Fair Value [Member]
Fair Value Measurements (Textual) [Abstract]
Commercial loan portfolios held-for-sale	$ 656,000,000