Acquisition, Divestiture and Discontinued Operations (Details 2) (Segment, Discontinued Operations [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Assumptions Used To Measure Fair Value of Assets And Liabilities (Textual) [Abstract]
Unearned Income	$ 2	$ 1
Charges determined by applying a matched funds transfer pricing methodology to the liabilities assumed necessary to support the discontinued operations, after tax	50	58	59
Trust [Member]
ASSETS
Trust Fair Value of Loans	2,726	3,125
LIABILITIES
Trust Fair Value of Securities	2,522	2,966
Contractual Values [Member]
Assumptions Used To Measure Fair Value of Assets And Liabilities (Textual) [Abstract]
Loans held by the trust in nonaccrual status	20
Loans held by portfolio in nonaccrual status	1
Loans held by trusts with unpaid balances ninety days or more past due	42
Loans held by portfolio with unpaid balances ninety days or more past due	2
Fair Value [Member]
Assumptions Used To Measure Fair Value of Assets And Liabilities (Textual) [Abstract]
Loans held by the trust in nonaccrual status	19
Loans held by portfolio in nonaccrual status	1
Loans held by trusts with unpaid balances ninety days or more past due	39
Loans held by portfolio with unpaid balances ninety days or more past due	2
Education Lending [Member]
Assumptions Used To Measure Fair Value of Assets And Liabilities (Textual) [Abstract]
Unearned Income	2	1
Charges determined by applying a matched funds transfer pricing methodology to the liabilities assumed necessary to support the discontinued operations, after tax	50	58	59
Economic interest or risk of loss associated with Education loan securitization trusts	210
Education Lending [Member] | Trust [Member]
ASSETS
Portfolio Contractual Amount of Loans	73
Portfolio Fair Value of Loans	76
Trust Contractual Amount of Loans	2,908
Trust Fair Value of Loans	2,726	3,125
Trust Contractual Amount of other assets	34
Trust Fair Value of other assets	34
LIABILITIES
Trust Contractual Amount of Securities	2,980
Trust Fair Value of Securities	2,522	2,966
Trust Contractual Amount of other liabilities	28
Trust Fair Value of other liabilities	$ 28