Acquisition, Divestiture and Discontinued Operations (Details 3) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
ASSETS MEASURED ON A RECURRING BASIS
Trust other assets	$ 112	$ 77
Total assets on a recurring basis at fair value	18,688	25,322
LIABILITIES MEASURED ON A RECURRING BASIS
Trust other Liabilities	45	66
Total liabilities on a recurring basis at fair value	1,700	2,175
Segment, Discontinued Operations [Member] | Education Lending [Member]
ASSETS MEASURED ON A RECURRING BASIS
Total assets on a recurring basis at fair value	2,836
LIABILITIES MEASURED ON A RECURRING BASIS
Total liabilities on a recurring basis at fair value	2,550
Segment, Discontinued Operations [Member] | Education Lending [Member] | Trust [Member]
ASSETS MEASURED ON A RECURRING BASIS
Portfolio loans	76
Trust loans	2,726
Trust other assets	34
LIABILITIES MEASURED ON A RECURRING BASIS
Trust securities	2,522
Trust other Liabilities	28
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	0
LIABILITIES MEASURED ON A RECURRING BASIS
Total liabilities on a recurring basis at fair value	0
Segment, Discontinued Operations [Member] | Level 1 [Member] | Education Lending [Member] | Trust [Member]
ASSETS MEASURED ON A RECURRING BASIS
Portfolio loans	0
Trust loans	0
Trust other assets	0
LIABILITIES MEASURED ON A RECURRING BASIS
Trust securities	0
Trust other Liabilities	0
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	0
LIABILITIES MEASURED ON A RECURRING BASIS
Total liabilities on a recurring basis at fair value	0
Segment, Discontinued Operations [Member] | Level 2 [Member] | Education Lending [Member] | Trust [Member]
ASSETS MEASURED ON A RECURRING BASIS
Portfolio loans	0
Trust loans	0
Trust other assets	0
LIABILITIES MEASURED ON A RECURRING BASIS
Trust securities	0
Trust other Liabilities	0
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	2,836
LIABILITIES MEASURED ON A RECURRING BASIS
Total liabilities on a recurring basis at fair value	2,550
Segment, Discontinued Operations [Member] | Level 3 [Member] | Education Lending [Member] | Trust [Member]
ASSETS MEASURED ON A RECURRING BASIS
Portfolio loans	76
Trust loans	2,726
Trust other assets	34
LIABILITIES MEASURED ON A RECURRING BASIS
Trust securities	2,522
Trust other Liabilities	$ 28