v2.4.0.8
Fair Value, Measurements From Brokers or Third Party Pricing Services (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Financial assets:    
Loans held for sale $ 2 $ 6
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
Financial liabilities:    
Fair Value Liability derivatives 0 0
Other liabilities 3 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) 332 406
Total Securities Available for Sale 15,768 1,657
Derivatives (trading and other assets) 6 8
Financial liabilities:    
Fair Value Liability derivatives 31 26
Other liabilities 166 121
Brokers [Member] | Level 2 [Member] | Debt Securities [Member]
   
Financial assets:    
Total Securities Available for Sale 15,768 1,654
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 0
Brokers [Member] | Level 2 [Member] | Mortgage Backed Securities [Member]
   
Financial assets:    
Total Securities Available for Sale 749 138
Brokers [Member] | Level 2 [Member] | Other Debt Securities [Member]
   
Financial assets:    
Total Securities Available for Sale 15,019 1,516
Brokers [Member] | Level 2 [Member] | Equity Securities [Member]
   
Financial assets:    
Total Securities Available for Sale 0 3
Brokers [Member] | Level 3 [Member]
   
Financial assets:    
Trading assets (excluding derivatives) 5 8
Total Securities Available for Sale 2,720 12,469
Derivatives (trading and other assets) 0 0
Financial liabilities:    
Fair Value Liability derivatives 0 0
Other liabilities 0 0
Brokers [Member] | Level 3 [Member] | Debt Securities [Member]
   
Financial assets:    
Total Securities Available for Sale 2,720 12,469
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 1 4
Brokers [Member] | Level 3 [Member] | Other Debt Securities [Member]
   
Financial assets:    
Total Securities Available for Sale 2,719 12,465
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) 1,431 1,314
Total Securities Available for Sale 528 944
Derivatives (trading and other assets) 0 0
Financial liabilities:    
Fair Value Liability derivatives 0 0
Other liabilities 0 0
Third party pricing services [Member] | Level 1 [Member] | Debt Securities [Member]
   
Financial assets:    
Total Securities Available for Sale 520 915
Third party pricing services [Member] | Level 1 [Member] | US Treasury and Government [Member]
   
Financial assets:    
Total Securities Available for Sale 520 915
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 8 29
Third party pricing services [Member] | Level 2 [Member]
   
Financial assets:    
Trading assets (excluding derivatives) 1,423 1,016
Total Securities Available for Sale 215,412 192,058
Derivatives (trading and other assets) 519 602
Financial liabilities:    
Fair Value Liability derivatives 517 634
Other liabilities 144 104
Third party pricing services [Member] | Level 2 [Member] | Debt Securities [Member]
   
Financial assets:    
Total Securities Available for Sale 214,607 191,284
Third party pricing services [Member] | Level 2 [Member] | US Treasury and Government [Member]
   
Financial assets:    
Total Securities Available for Sale 5,863 6,231
Third party pricing services [Member] | Level 2 [Member] | US States and Political Subdivisions [Member]
   
Financial assets:    
Total Securities Available for Sale 37,050 35,036
Third party pricing services [Member] | Level 2 [Member] | Mortgage Backed Securities [Member]
   
Financial assets:    
Total Securities Available for Sale 143,074 121,703
Third party pricing services [Member] | Level 2 [Member] | Other Debt Securities [Member]
   
Financial assets:    
Total Securities Available for Sale 28,620 28,314
Third party pricing services [Member] | Level 2 [Member] | Equity Securities [Member]
   
Financial assets:    
Total Securities Available for Sale 805 774
Third party pricing services [Member] | Level 3 [Member]
   
Financial assets:    
Trading assets (excluding derivatives) 0 0
Total Securities Available for Sale 463 441
Derivatives (trading and other assets) 2 0
Financial liabilities:    
Fair Value Liability derivatives 0 0
Other liabilities 0 0
Third party pricing services [Member] | Level 3 [Member] | Debt Securities [Member]
   
Financial assets:    
Total Securities Available for Sale 463 441
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 68 0
Third party pricing services [Member] | Level 3 [Member] | Mortgage Backed Securities [Member]
   
Financial assets:    
Total Securities Available for Sale 286 292
Third party pricing services [Member] | Level 3 [Member] | Other Debt Securities [Member]
   
Financial assets:    
Total Securities Available for Sale 109 149
Third party pricing services [Member] | Level 3 [Member] | Equity Securities [Member]
   
Financial assets:    
Total Securities Available for Sale $ 0 $ 0