v2.4.0.6
Fair Value, Measurements From Brokers or Third Party Pricing Services (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Financial assets:    
Loans held for sale $ 0 $ 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 6 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) 664 406
Total Securities Available for Sale 15,368 1,657
Derivatives (trading and other assets) 8 8
Financial liabilities:    
Fair Value Liability derivatives 71 26
Other liabilities 218 121
Brokers [Member] | Level 2 [Member] | Debt Securities [Member]
   
Financial assets:    
Total Securities Available for Sale 15,365 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 161 0
Brokers [Member] | Level 2 [Member] | Mortgage Backed Securities [Member]
   
Financial assets:    
Total Securities Available for Sale 365 138
Brokers [Member] | Level 2 [Member] | Other Debt Securities [Member]
   
Financial assets:    
Total Securities Available for Sale 14,839 1,516
Brokers [Member] | Level 2 [Member] | Equity Securities [Member]
   
Financial assets:    
Total Securities Available for Sale 3 3
Brokers [Member] | Level 3 [Member]
   
Financial assets:    
Trading assets (excluding derivatives) 7 8
Total Securities Available for Sale 2,592 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 2,592 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 4 4
Brokers [Member] | Level 3 [Member] | Other Debt Securities [Member]
   
Financial assets:    
Total Securities Available for Sale 2,588 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) 1,335 1,314
Total Securities Available for Sale 716 944
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 716 915
Third party pricing services [Member] | Level 1 [Member] | US Treasury and Government [Member]
   
Financial assets:    
Total Securities Available for Sale 716 915
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 0 29
Third party pricing services [Member] | Level 2 [Member]
   
Financial assets:    
Trading assets (excluding derivatives) 813 1,016
Total Securities Available for Sale 213,111 192,058
Derivatives (trading and other assets) 591 602
Financial liabilities:    
Fair Value Liability derivatives 593 634
Other liabilities 41 104
Third party pricing services [Member] | Level 2 [Member] | Debt Securities [Member]
   
Financial assets:    
Total Securities Available for Sale 212,301 191,284
Third party pricing services [Member] | Level 2 [Member] | US Treasury and Government [Member]
   
Financial assets:    
Total Securities Available for Sale 6,168 6,231
Third party pricing services [Member] | Level 2 [Member] | US States and Political Subdivisions [Member]
   
Financial assets:    
Total Securities Available for Sale 36,630 35,036
Third party pricing services [Member] | Level 2 [Member] | Mortgage Backed Securities [Member]
   
Financial assets:    
Total Securities Available for Sale 139,882 121,703
Third party pricing services [Member] | Level 2 [Member] | Other Debt Securities [Member]
   
Financial assets:    
Total Securities Available for Sale 29,621 28,314
Third party pricing services [Member] | Level 2 [Member] | Equity Securities [Member]
   
Financial assets:    
Total Securities Available for Sale 810 774
Third party pricing services [Member] | Level 3 [Member]
   
Financial assets:    
Trading assets (excluding derivatives) 0 0
Total Securities Available for Sale 356 441
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 356 441
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 0 0
Third party pricing services [Member] | Level 3 [Member] | Mortgage Backed Securities [Member]
   
Financial assets:    
Total Securities Available for Sale 283 292
Third party pricing services [Member] | Level 3 [Member] | Other Debt Securities [Member]
   
Financial assets:    
Total Securities Available for Sale 73 149
Third party pricing services [Member] | Level 3 [Member] | Equity Securities [Member]
   
Financial assets:    
Total Securities Available for Sale $ 0 $ 0