v2.4.0.6
Fair Value, Assets Recorded at Fair Value on Nonrecurring Basis (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgages held for sale $ 44,791 $ 47,531
Loans held for sale 1,176 873
Loans 5,916 309
MSRs (carried at fair value) 12,603 14,467
Fair Value, Measurements, Nonrecurring [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgages held for sale 2,185 2,891
Loans held for sale 86 352
Loans 5,681 8,435
MSRs (carried at fair value) 293 104
Other assets 604 847
Fair Value, Measurements, Nonrecurring [Member] | Total Commercial [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans 1,514 2,547
Fair Value, Measurements, Nonrecurring [Member] | Total Consumer [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans 4,167 5,888
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 1,019 2,000
Loans held for sale 86 352
Loans 5,664 8,350
MSRs (carried at fair value) 0 0
Other assets 537 765
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 1,501 2,480
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 4,163 5,870
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 1,166 891
Loans held for sale 0 0
Loans 17 85
MSRs (carried at fair value) 293 104
Other assets 67 82
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 13 67
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 $ 4 $ 18