Accounting Policies (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2011
Loan-to-value ratio	90.00%
Recorded Investment Due To New TDR Guidance	$ 69
Allowance For Credit Losses Associated With New Tdr Guidance	21
Other Assets - BlackRock Series C Preferred Stock [Member]
Total shares accounted for relating to BlackRock Series C Preferred Stock	1.5
Total shares delivered for relating to BlackRock Series C Preferred Stock	1.3
120 Days Past Due For Term Loans [Member]
Charge off threshold - small business commercial loans	1
180 Days Past Due For Revolvers [Member]
Charge off threshold - small business commercial loans	$ 1