v2.4.0.6
Cash, Loan and Dividend Restrictions (Details) (USD $)
In Billions, except Per Share data, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2011
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Cash, Loan and Dividend Restrictions (Textual) [Abstract]        
Average required reserve balance on deposits   $ 7.0 $ 6.0  
Per share dividend amount requiring approval $ 0.12 $ 0.48 $ 0.20 $ 0.49
Total capital ratio required to be well capitalized 10.00% 10.00% 10.00%  
Credit And Non-Credit Transactions With All Nonbank Affiliates, Maximum Percent of Bank Capital and Surplus 20.00% 20.00%    
Credit and non-credit transactions with a single nonbank affiliate, maximum percent of bank capital and surplus [Member]
       
Cash, Loan and Dividend Restrictions (Textual) [Abstract]        
Total capital ratio required to be well capitalized 10.00% 10.00%    
Nonbank Subsidiaries [Member]
       
Cash, Loan and Dividend Restrictions (Textual) [Abstract]        
Additional dividends that could have been declared by national and state-chartered subsidiary bank/ Nonbank Subsidiaries 5.7 5.7    
National And State Chartered Subsidiary Banks [Member]
       
Cash, Loan and Dividend Restrictions (Textual) [Abstract]        
Additional dividends that could have been declared by national and state-chartered subsidiary bank/ Nonbank Subsidiaries $ 0.6 $ 0.6