v2.4.0.6
Fair Value, Assets Recorded at Fair Value on Nonrecurring Basis (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgages held for sale $ 42,624 $ 42,305
Loans held for sale 0 6
Loans 6,183 6,206
MSRs (carried at fair value) 12,061 11,538
Other assets 197 0
Nonrecurring [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgages held for sale 3,197 2,554
Loans held for sale 0 4
Loans 1,776 7,400
Other assets 356 1,133
Nonrecurring [Member] | Commercial Portfolio Segment [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans 231 1,507
Nonrecurring [Member] | Consumer Portfolio Segment [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans 1,545 5,893
Level 1 [Member] | Nonrecurring [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgages held for sale 0 0
Loans held for sale 0 0
Loans 0 0
Other assets 0 0
Level 1 [Member] | Nonrecurring [Member] | Commercial Portfolio Segment [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans 0 0
Level 1 [Member] | Nonrecurring [Member] | Consumer Portfolio Segment [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans 0 0
Level 2 [Member] | Nonrecurring [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgages held for sale 2,155 1,509
Loans held for sale 0 4
Loans 1,769 7,396
Other assets 290 989
Level 2 [Member] | Nonrecurring [Member] | Commercial Portfolio Segment [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans 228 1,507
Level 2 [Member] | Nonrecurring [Member] | Consumer Portfolio Segment [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans 1,541 5,889
Level 3 [Member] | Nonrecurring [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgages held for sale 1,042 1,045
Loans held for sale 0 0
Loans 7 4
Other assets 66 144
Level 3 [Member] | Nonrecurring [Member] | Commercial Portfolio Segment [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans 3 0
Level 3 [Member] | Nonrecurring [Member] | Consumer Portfolio Segment [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans $ 4 $ 4