Acquisition and Discontinued Operations (Details 3) (USD $) In Millions, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
ASSETS MEASURED ON A RECURRING BASIS
Trust other assets	$ 118	$ 112
Total assets on a recurring basis at fair value	17,273	18,688
LIABILITIES MEASURED ON A RECURRING BASIS
Trust other Liabilities	8	45
Total liabilities on a recurring basis at fair value	1,480	1,700
Segment, Discontinued Operations [Member] | Education Lending [Member]
ASSETS MEASURED ON A RECURRING BASIS
Total assets on a recurring basis at fair value	2,821
LIABILITIES MEASURED ON A RECURRING BASIS
Total liabilities on a recurring basis at fair value	2,542
Segment, Discontinued Operations [Member] | Education Lending [Member] | Trust [Member]
ASSETS MEASURED ON A RECURRING BASIS
Portfolio loans	74
Trust loans	2,714
Trust other assets	33
LIABILITIES MEASURED ON A RECURRING BASIS
Trust securities	2,512
Trust other Liabilities	30
Segment, Discontinued Operations [Member] | Level 1 [Member] | Education Lending [Member]
ASSETS MEASURED ON A RECURRING BASIS
Total assets on a recurring basis at fair value
LIABILITIES MEASURED ON A RECURRING BASIS
Total liabilities on a recurring basis at fair value
Segment, Discontinued Operations [Member] | Level 1 [Member] | Education Lending [Member] | Trust [Member]
ASSETS MEASURED ON A RECURRING BASIS
Portfolio loans
Trust loans
Trust other assets
LIABILITIES MEASURED ON A RECURRING BASIS
Trust securities
Trust other Liabilities
Segment, Discontinued Operations [Member] | Level 2 [Member] | Education Lending [Member]
ASSETS MEASURED ON A RECURRING BASIS
Total assets on a recurring basis at fair value
LIABILITIES MEASURED ON A RECURRING BASIS
Total liabilities on a recurring basis at fair value
Segment, Discontinued Operations [Member] | Level 2 [Member] | Education Lending [Member] | Trust [Member]
ASSETS MEASURED ON A RECURRING BASIS
Portfolio loans
Trust loans
Trust other assets
LIABILITIES MEASURED ON A RECURRING BASIS
Trust securities
Trust other Liabilities
Segment, Discontinued Operations [Member] | Level 3 [Member] | Education Lending [Member]
ASSETS MEASURED ON A RECURRING BASIS
Total assets on a recurring basis at fair value	2,821
LIABILITIES MEASURED ON A RECURRING BASIS
Total liabilities on a recurring basis at fair value	2,542
Segment, Discontinued Operations [Member] | Level 3 [Member] | Education Lending [Member] | Trust [Member]
ASSETS MEASURED ON A RECURRING BASIS
Portfolio loans	74
Trust loans	2,714
Trust other assets	33
LIABILITIES MEASURED ON A RECURRING BASIS
Trust securities	2,512
Trust other Liabilities	$ 30