v2.4.0.6
Fair Value, Measurements From Brokers or Third Party Pricing Services (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Financial assets:    
Loans held for sale $ 6 $ 1,176
Brokers [Member] | Level 1 [Member]
   
Financial assets:    
Trading assets (excluding derivatives) 0 0
Total Securities Available for Sale 0 0
Derivatives (trading and other assets) 0 0
Loans held for sale 0 0
Financial liabilities:    
Derivatives (liabilities) 0 0
Other liabilities 0 0
Brokers [Member] | Level 1 [Member] | Debt Securities [Member]
   
Financial assets:    
Total Securities Available for Sale 0 0
Brokers [Member] | Level 1 [Member] | US Treasury and Government [Member]
   
Financial assets:    
Total Securities Available for Sale 0 0
Brokers [Member] | Level 1 [Member] | US States and Political Subdivisions [Member]
   
Financial assets:    
Total Securities Available for Sale 0 0
Brokers [Member] | Level 1 [Member] | Mortgage Backed Securities [Member]
   
Financial assets:    
Total Securities Available for Sale 0 0
Brokers [Member] | Level 1 [Member] | Other Debt Securities [Member]
   
Financial assets:    
Total Securities Available for Sale 0 0
Brokers [Member] | Level 1 [Member] | Equity Securities [Member]
   
Financial assets:    
Total Securities Available for Sale 0 0
Brokers [Member] | Level 2 [Member]
   
Financial assets:    
Trading assets (excluding derivatives) 406 446
Total Securities Available for Sale 1,657 3,449
Derivatives (trading and other assets) 8 17
Loans held for sale 0 0
Financial liabilities:    
Derivatives (liabilities) 26 11
Other liabilities 121 22
Brokers [Member] | Level 2 [Member] | Debt Securities [Member]
   
Financial assets:    
Total Securities Available for Sale 1,654 3,449
Brokers [Member] | Level 2 [Member] | US Treasury and Government [Member]
   
Financial assets:    
Total Securities Available for Sale 0 0
Brokers [Member] | Level 2 [Member] | US States and Political Subdivisions [Member]
   
Financial assets:    
Total Securities Available for Sale 0 16
Brokers [Member] | Level 2 [Member] | Mortgage Backed Securities [Member]
   
Financial assets:    
Total Securities Available for Sale 138 2,342
Brokers [Member] | Level 2 [Member] | Other Debt Securities [Member]
   
Financial assets:    
Total Securities Available for Sale 1,516 1,091
Brokers [Member] | Level 2 [Member] | Equity Securities [Member]
   
Financial assets:    
Total Securities Available for Sale 3 0
Brokers [Member] | Level 3 [Member]
   
Financial assets:    
Trading assets (excluding derivatives) 8 7
Total Securities Available for Sale 12,469 8,206
Derivatives (trading and other assets) 0 44
Loans held for sale 0 0
Financial liabilities:    
Derivatives (liabilities) 0 43
Other liabilities 0 0
Brokers [Member] | Level 3 [Member] | Debt Securities [Member]
   
Financial assets:    
Total Securities Available for Sale 12,469 8,206
Brokers [Member] | Level 3 [Member] | US Treasury and Government [Member]
   
Financial assets:    
Total Securities Available for Sale 0 0
Brokers [Member] | Level 3 [Member] | US States and Political Subdivisions [Member]
   
Financial assets:    
Total Securities Available for Sale 0 0
Brokers [Member] | Level 3 [Member] | Mortgage Backed Securities [Member]
   
Financial assets:    
Total Securities Available for Sale 4 43
Brokers [Member] | Level 3 [Member] | Other Debt Securities [Member]
   
Financial assets:    
Total Securities Available for Sale 12,465 8,163
Brokers [Member] | Level 3 [Member] | Equity Securities [Member]
   
Financial assets:    
Total Securities Available for Sale 0 0
Third party pricing services [Member] | Level 1 [Member]
   
Financial assets:    
Trading assets (excluding derivatives) 1,314 1,086
Total Securities Available for Sale 944 901
Derivatives (trading and other assets) 0 0
Loans held for sale 0 0
Financial liabilities:    
Derivatives (liabilities) 0 0
Other liabilities 0 6
Third party pricing services [Member] | Level 1 [Member] | Debt Securities [Member]
   
Financial assets:    
Total Securities Available for Sale 915 868
Third party pricing services [Member] | Level 1 [Member] | US Treasury and Government [Member]
   
Financial assets:    
Total Securities Available for Sale 915 868
Third party pricing services [Member] | Level 1 [Member] | US States and Political Subdivisions [Member]
   
Financial assets:    
Total Securities Available for Sale 0 0
Third party pricing services [Member] | Level 1 [Member] | Mortgage Backed Securities [Member]
   
Financial assets:    
Total Securities Available for Sale 0 0
Third party pricing services [Member] | Level 1 [Member] | Other Debt Securities [Member]
   
Financial assets:    
Total Securities Available for Sale 0 0
Third party pricing services [Member] | Level 1 [Member] | Equity Securities [Member]
   
Financial assets:    
Total Securities Available for Sale 29 33
Third party pricing services [Member] | Level 2 [Member]
   
Financial assets:    
Trading assets (excluding derivatives) 1,016 1,564
Total Securities Available for Sale 192,058 171,756
Derivatives (trading and other assets) 602 834
Loans held for sale 0 1
Financial liabilities:    
Derivatives (liabilities) 634 850
Other liabilities 104 249
Third party pricing services [Member] | Level 2 [Member] | Debt Securities [Member]
   
Financial assets:    
Total Securities Available for Sale 191,284 171,091
Third party pricing services [Member] | Level 2 [Member] | US Treasury and Government [Member]
   
Financial assets:    
Total Securities Available for Sale 6,231 5,748
Third party pricing services [Member] | Level 2 [Member] | US States and Political Subdivisions [Member]
   
Financial assets:    
Total Securities Available for Sale 35,036 21,014
Third party pricing services [Member] | Level 2 [Member] | Mortgage Backed Securities [Member]
   
Financial assets:    
Total Securities Available for Sale 121,703 118,107
Third party pricing services [Member] | Level 2 [Member] | Other Debt Securities [Member]
   
Financial assets:    
Total Securities Available for Sale 28,314 26,222
Third party pricing services [Member] | Level 2 [Member] | Equity Securities [Member]
   
Financial assets:    
Total Securities Available for Sale 774 665
Third party pricing services [Member] | Level 3 [Member]
   
Financial assets:    
Trading assets (excluding derivatives) 0 0
Total Securities Available for Sale 441 334
Derivatives (trading and other assets) 0 0
Loans held for sale 0 0
Financial liabilities:    
Derivatives (liabilities) 0 0
Other liabilities 0 0
Third party pricing services [Member] | Level 3 [Member] | Debt Securities [Member]
   
Financial assets:    
Total Securities Available for Sale 441 331
Third party pricing services [Member] | Level 3 [Member] | US Treasury and Government [Member]
   
Financial assets:    
Total Securities Available for Sale 0 0
Third party pricing services [Member] | Level 3 [Member] | US States and Political Subdivisions [Member]
   
Financial assets:    
Total Securities Available for Sale 0 0
Third party pricing services [Member] | Level 3 [Member] | Mortgage Backed Securities [Member]
   
Financial assets:    
Total Securities Available for Sale 292 186
Third party pricing services [Member] | Level 3 [Member] | Other Debt Securities [Member]
   
Financial assets:    
Total Securities Available for Sale 149 145
Third party pricing services [Member] | Level 3 [Member] | Equity Securities [Member]
   
Financial assets:    
Total Securities Available for Sale $ 0 $ 3