v2.4.0.6
Fair Value, Assets Recorded at Fair Value on Nonrecurring Basis (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgages held for sale $ 42,305 $ 44,791
Loans held for sale 6 1,176
Loans 6,206 5,916
MSRs (carried at fair value) 11,538 12,603
Nonrecurring [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgages held for sale 2,554 2,185
Loans held for sale 4 86
Loans 7,400 5,681
MSRs (carried at fair value) 0 293
Other assets 1,133 604
Nonrecurring [Member] | Commercial Portfolio Segment [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans 1,507 1,514
Nonrecurring [Member] | Consumer Portfolio Segment [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans 5,893 4,167
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
MSRs (carried at fair value) 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 1,509 1,019
Loans held for sale 4 86
Loans 7,396 5,664
MSRs (carried at fair value) 0 0
Other assets 989 537
Level 2 [Member] | Nonrecurring [Member] | Commercial Portfolio Segment [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans 1,507 1,501
Level 2 [Member] | Nonrecurring [Member] | Consumer Portfolio Segment [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans 5,889 4,163
Level 3 [Member] | Nonrecurring [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgages held for sale 1,045 1,166
Loans held for sale 0 0
Loans 4 17
MSRs (carried at fair value) 0 293
Other assets 144 67
Level 3 [Member] | Nonrecurring [Member] | Commercial Portfolio Segment [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans 0 13
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