Accounting Policies (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Mar. 02, 2012 RBC Bank Usa Acquisition [Member]		Mar. 02, 2012 RBC Bank Usa Acquisition [Member] Deposits [Member]		Mar. 02, 2012 RBC Bank Usa Acquisition [Member] Loans [Member]		Sep. 30, 2012 Other Assets - BlackRock Series C Preferred Stock [Member]	Sep. 30, 2012 Blackrock Series B Preferred Stock [Member]
Total Shares Acquired In Acquisition		100.00%
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net		$ 2,649	[1],[2]	$ (18,094)	[1],[2]	$ 14,512	[1],[2]
Investment Owned Preferred Stock Transferred for Common Stock									2
Total shares accounted for relating to BlackRock Series C Preferred Stock								1.5
Total shares delivered relating to BlackRock Series C Preferred Stock								1.3
Charge off threshold - small business commercial loans	1
Additional Troubled Debt Restructurings Added Due To Bankruptcy	154.8
Charge Offs Taken On Additional Nonperforming Consumer Loans	$ 82.9

[1] The table above has been updated to reflect certain immaterial adjustments, including final purchase price settlement.

[2] These items are considered as non-cash activity for the Consolidated Statement of Cash Flows.