v2.4.0.6
Fair Value, Assets Recorded at Fair Value on Nonrecurring Basis (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgages held for sale $ 39,183 $ 44,791
Loans held for sale 796 1,176
Loans 6,037 5,916
MSRs (carried at fair value) 13,578 12,603
Fair Value, Measurements, Nonrecurring [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgages held for sale 2,509 2,185
Loans held for sale 49 86
Loans 2,572 5,681
MSRs (carried at fair value) 0 293
Other assets 548 604
Fair Value, Measurements, Nonrecurring [Member] | Total Commercial [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans 647 1,514
Fair Value, Measurements, Nonrecurring [Member] | Total Consumer [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans 1,925 4,167
Level 1 [Member] | Fair Value, Measurements, 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] | Fair Value, Measurements, Nonrecurring [Member] | Total Commercial [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans 0 0
Level 1 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Total Consumer [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans 0 0
Level 2 [Member] | Fair Value, Measurements, Nonrecurring [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgages held for sale 1,315 1,019
Loans held for sale 49 86
Loans 2,571 5,664
MSRs (carried at fair value) 0 0
Other assets 528 537
Level 2 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Total Commercial [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans 647 1,501
Level 2 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Total Consumer [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans 1,924 4,163
Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgages held for sale 1,194 1,166
Loans held for sale 0 0
Loans 1 17
MSRs (carried at fair value) 0 293
Other assets 20 67
Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Total Commercial [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans 0 13
Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Total Consumer [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans $ 1 $ 4