v2.4.0.6
Fair Value, Measurements From Independent Brokers or Independent Third Party Pricing Services (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Financial assets:    
Loans held for sale $ 796 $ 1,176
Independent 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
Independent brokers [Member] | Level 1 [Member] | Debt Securities [Member]
   
Financial assets:    
Total Securities Available for Sale 0 0
Independent brokers [Member] | Level 1 [Member] | US Treasury and Government [Member]
   
Financial assets:    
Total Securities Available for Sale 0 0
Independent brokers [Member] | Level 1 [Member] | US States and Political Subdivisions [Member]
   
Financial assets:    
Total Securities Available for Sale 0 0
Independent brokers [Member] | Level 1 [Member] | Mortgage Backed Securities [Member]
   
Financial assets:    
Total Securities Available for Sale 0 0
Independent brokers [Member] | Level 1 [Member] | Other Debt Securities [Member]
   
Financial assets:    
Total Securities Available for Sale 0 0
Independent brokers [Member] | Level 1 [Member] | Equity Securities [Member]
   
Financial assets:    
Total Securities Available for Sale 0 0
Independent brokers [Member] | Level 2 [Member]
   
Financial assets:    
Trading assets (excluding derivatives) 285 446
Total Securities Available for Sale 733 3,449
Derivatives (trading and other assets) 12 17
Loans held for sale 0 0
Financial liabilities:    
Derivatives (liabilities) 10 11
Other liabilities 22 22
Independent brokers [Member] | Level 2 [Member] | Debt Securities [Member]
   
Financial assets:    
Total Securities Available for Sale 733 3,449
Independent brokers [Member] | Level 2 [Member] | US Treasury and Government [Member]
   
Financial assets:    
Total Securities Available for Sale 0 0
Independent brokers [Member] | Level 2 [Member] | US States and Political Subdivisions [Member]
   
Financial assets:    
Total Securities Available for Sale 17 16
Independent brokers [Member] | Level 2 [Member] | Mortgage Backed Securities [Member]
   
Financial assets:    
Total Securities Available for Sale 369 2,342
Independent brokers [Member] | Level 2 [Member] | Other Debt Securities [Member]
   
Financial assets:    
Total Securities Available for Sale 347 1,091
Independent brokers [Member] | Level 2 [Member] | Equity Securities [Member]
   
Financial assets:    
Total Securities Available for Sale 0 0
Independent brokers [Member] | Level 3 [Member]
   
Financial assets:    
Trading assets (excluding derivatives) 7 7
Total Securities Available for Sale 8,514 8,206
Derivatives (trading and other assets) 46 44
Loans held for sale 0 0
Financial liabilities:    
Derivatives (liabilities) 27 43
Other liabilities 0 0
Independent brokers [Member] | Level 3 [Member] | Debt Securities [Member]
   
Financial assets:    
Total Securities Available for Sale 8,514 8,206
Independent brokers [Member] | Level 3 [Member] | US Treasury and Government [Member]
   
Financial assets:    
Total Securities Available for Sale 0 0
Independent brokers [Member] | Level 3 [Member] | US States and Political Subdivisions [Member]
   
Financial assets:    
Total Securities Available for Sale 0 0
Independent brokers [Member] | Level 3 [Member] | Mortgage Backed Securities [Member]
   
Financial assets:    
Total Securities Available for Sale 45 43
Independent brokers [Member] | Level 3 [Member] | Other Debt Securities [Member]
   
Financial assets:    
Total Securities Available for Sale 8,469 8,163
Independent brokers [Member] | Level 3 [Member] | Equity Securities [Member]
   
Financial assets:    
Total Securities Available for Sale 0 0
Fair Value Measurements From Third Party Pricing Services [Member] | Level 1 [Member]
   
Financial assets:    
Trading assets (excluding derivatives) 1,209 1,086
Total Securities Available for Sale 1,117 901
Derivatives (trading and other assets) 0 0
Loans held for sale 0 0
Financial liabilities:    
Derivatives (liabilities) 0 0
Other liabilities 0 6
Fair Value Measurements From Third Party Pricing Services [Member] | Level 1 [Member] | Debt Securities [Member]
   
Financial assets:    
Total Securities Available for Sale 1,080 868
Fair Value Measurements From Third Party Pricing Services [Member] | Level 1 [Member] | US Treasury and Government [Member]
   
Financial assets:    
Total Securities Available for Sale 1,080 868
Fair Value Measurements From Third Party Pricing Services [Member] | Level 1 [Member] | US States and Political Subdivisions [Member]
   
Financial assets:    
Total Securities Available for Sale 0 0
Fair Value Measurements From Third Party Pricing Services [Member] | Level 1 [Member] | Mortgage Backed Securities [Member]
   
Financial assets:    
Total Securities Available for Sale 0 0
Fair Value Measurements From Third Party Pricing Services [Member] | Level 1 [Member] | Other Debt Securities [Member]
   
Financial assets:    
Total Securities Available for Sale 0 0
Fair Value Measurements From Third Party Pricing Services [Member] | Level 1 [Member] | Equity Securities [Member]
   
Financial assets:    
Total Securities Available for Sale 37 33
Fair Value Measurements From Third Party Pricing Services [Member] | Level 2 [Member]
   
Financial assets:    
Trading assets (excluding derivatives) 1,345 1,564
Total Securities Available for Sale 179,616 171,756
Derivatives (trading and other assets) 709 834
Loans held for sale 1 1
Financial liabilities:    
Derivatives (liabilities) 681 850
Other liabilities 208 249
Fair Value Measurements From Third Party Pricing Services [Member] | Level 2 [Member] | Debt Securities [Member]
   
Financial assets:    
Total Securities Available for Sale 178,985 171,091
Fair Value Measurements From Third Party Pricing Services [Member] | Level 2 [Member] | US Treasury and Government [Member]
   
Financial assets:    
Total Securities Available for Sale 3,598 5,748
Fair Value Measurements From Third Party Pricing Services [Member] | Level 2 [Member] | US States and Political Subdivisions [Member]
   
Financial assets:    
Total Securities Available for Sale 21,631 21,014
Fair Value Measurements From Third Party Pricing Services [Member] | Level 2 [Member] | Mortgage Backed Securities [Member]
   
Financial assets:    
Total Securities Available for Sale 126,554 118,107
Fair Value Measurements From Third Party Pricing Services [Member] | Level 2 [Member] | Other Debt Securities [Member]
   
Financial assets:    
Total Securities Available for Sale 27,202 26,222
Fair Value Measurements From Third Party Pricing Services [Member] | Level 2 [Member] | Equity Securities [Member]
   
Financial assets:    
Total Securities Available for Sale 631 665
Fair Value Measurements From Third Party Pricing Services [Member] | Level 3 [Member]
   
Financial assets:    
Trading assets (excluding derivatives) 0 0
Total Securities Available for Sale 1,564 334
Derivatives (trading and other assets) 1 0
Loans held for sale 0 0
Financial liabilities:    
Derivatives (liabilities) 0 0
Other liabilities 2 0
Fair Value Measurements From Third Party Pricing Services [Member] | Level 3 [Member] | Debt Securities [Member]
   
Financial assets:    
Total Securities Available for Sale 1,564 331
Fair Value Measurements From Third Party Pricing Services [Member] | Level 3 [Member] | US Treasury and Government [Member]
   
Financial assets:    
Total Securities Available for Sale 0 0
Fair Value Measurements From Third Party Pricing Services [Member] | Level 3 [Member] | US States and Political Subdivisions [Member]
   
Financial assets:    
Total Securities Available for Sale 997 0
Fair Value Measurements From Third Party Pricing Services [Member] | Level 3 [Member] | Mortgage Backed Securities [Member]
   
Financial assets:    
Total Securities Available for Sale 187 186
Fair Value Measurements From Third Party Pricing Services [Member] | Level 3 [Member] | Other Debt Securities [Member]
   
Financial assets:    
Total Securities Available for Sale 380 145
Fair Value Measurements From Third Party Pricing Services [Member] | Level 3 [Member] | Equity Securities [Member]
   
Financial assets:    
Total Securities Available for Sale $ 0 $ 3