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Securitizations and Variable Interest Entities (Details) (USD $)
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2008
Variable Interest Entity Consolidated Carrying Amount Assets and Liabilities          
Cash and due from banks $ 21,860,000,000 $ 19,440,000,000 $ 16,044,000,000 $ 27,080,000,000  
Trading assets 57,482,000,000 77,814,000,000      
Securities available for sale 235,199,000,000 222,613,000,000      
Mortgages held for sale 47,149,000,000 48,357,000,000      
Loans 799,574,000,000 769,631,000,000 757,267,000,000 782,770,000,000 864,830,000,000
MSRs (carried at fair value) 11,538,000,000 12,603,000,000      
Other assets 93,578,000,000 101,022,000,000      
Total assets 1,422,968,000,000 [1] 1,313,867,000,000 [1]      
Short-term borrowings, Amount 57,175,000,000 49,091,000,000 55,401,000,000    
Accrued expenses and other liabilities 76,668,000,000 77,665,000,000      
Long-term debt (includes $1 and $0 carried at fair value) 127,379,000,000 125,354,000,000      
Total liabilities 1,264,057,000,000 [2] 1,172,180,000,000 [2]      
Noncontrolling interests 1,357,000,000 1,446,000,000      
VIEs that we do not consolidate [Member]
         
Variable Interest Entity Consolidated Carrying Amount Assets and Liabilities          
Cash and due from banks 0 0      
Trading assets 1,902,000,000 3,723,000,000      
Securities available for sale 19,900,000,000 21,708,000,000      
Mortgages held for sale 0 0      
Loans 9,841,000,000 11,404,000,000      
MSRs (carried at fair value) 11,114,000,000 12,080,000,000      
Other assets 4,993,000,000 4,494,000,000      
Total assets 47,750,000,000 53,409,000,000      
Short-term borrowings, Amount 0 0      
Accrued expenses and other liabilities 3,441,000,000 3,350,000,000      
Long-term debt (includes $1 and $0 carried at fair value) 0 0      
Total liabilities 3,441,000,000 3,350,000,000      
Noncontrolling interests 0 0      
Net assets 44,309,000,000 50,059,000,000      
VIEs that we consolidate [Member]
         
Variable Interest Entity Consolidated Carrying Amount Assets and Liabilities          
Cash and due from banks 260,000,000 321,000,000      
Trading assets 114,000,000 293,000,000      
Securities available for sale 2,772,000,000 3,332,000,000      
Mortgages held for sale 469,000,000 444,000,000      
Loans 10,553,000,000 11,967,000,000      
MSRs (carried at fair value) 0 0      
Other assets 457,000,000 1,858,000,000      
Total assets 14,625,000,000 18,215,000,000      
Short-term borrowings, Amount 2,059,000,000 3,450,000,000      
Accrued expenses and other liabilities 901,000,000 1,138,000,000      
Long-term debt (includes $1 and $0 carried at fair value) 3,483,000,000 4,932,000,000      
Total liabilities 6,443,000,000 9,520,000,000      
Noncontrolling interests 48,000,000 61,000,000      
Net assets 8,134,000,000 8,634,000,000      
Transfers Accounted For As Secured Borrowings [Member]
         
Variable Interest Entity Consolidated Carrying Amount Assets and Liabilities          
Cash and due from banks 30,000,000 11,000,000      
Trading assets 218,000,000 30,000,000      
Securities available for sale 14,848,000,000 11,671,000,000      
Mortgages held for sale 0 0      
Loans 7,088,000,000 7,181,000,000      
MSRs (carried at fair value) 0 0      
Other assets 161,000,000 137,000,000      
Total assets 22,345,000,000 19,030,000,000      
Short-term borrowings, Amount 13,228,000,000 10,682,000,000      
Accrued expenses and other liabilities 20,000,000 121,000,000      
Long-term debt (includes $1 and $0 carried at fair value) 6,520,000,000 6,686,000,000      
Total liabilities 19,768,000,000 17,489,000,000      
Noncontrolling interests 0 0      
Net assets 2,577,000,000 1,541,000,000      
Total VIE [Member]
         
Variable Interest Entity Consolidated Carrying Amount Assets and Liabilities          
Cash and due from banks 290,000,000 332,000,000      
Trading assets 2,234,000,000 4,046,000,000      
Securities available for sale 37,520,000,000 36,711,000,000      
Mortgages held for sale 469,000,000 444,000,000      
Loans 27,482,000,000 30,552,000,000      
MSRs (carried at fair value) 11,114,000,000 12,080,000,000      
Other assets 5,611,000,000 6,489,000,000      
Total assets 84,720,000,000 90,654,000,000      
Short-term borrowings, Amount 15,287,000,000 14,132,000,000      
Accrued expenses and other liabilities 4,362,000,000 4,609,000,000      
Long-term debt (includes $1 and $0 carried at fair value) 10,003,000,000 11,618,000,000      
Total liabilities 29,652,000,000 30,359,000,000      
Noncontrolling interests 48,000,000 61,000,000      
Net assets $ 55,020,000,000 $ 60,234,000,000      
[1] Our consolidated assets at December 31, 2012 and December 31, 2011, include the following assets of certain variable interest entities (VIEs) that can only be used to settle the liabilities of those VIEs: Cash and due from banks, $260 million and $321 million; Trading assets, $114 million and $293 million; Securities available for sale, $2.8 billion and $3.3 billion; Mortgages held for sale, $469 million and $444 million; Net loans, $10.6 billion and $12.0 billion; Other assets, $457 million and $1.9 billion, and Total assets, $14.6 billion and $18.2 billion, respectively.
[2] Our consolidated liabilities at December 31, 2012 and December 31, 2011, include the following VIE liabilities for which the VIE creditors do not have recourse to Wells Fargo: Short-term borrowings, $0 and $24 million; Accrued expenses and other liabilities, $134 million and $175 million; Long-term debt, $3.5 billion and $4.9 billion; and Total liabilities, $3.6 billion and $5.1 billion, respectively.