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Regulatory and Agency Capital Requirements (Details) (USD $)
In Billions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Regulatory And Agency Capital Requirements [Abstract]    
Tier 1 capital ratio required to be well capitalized 6.00%  
Total capital ratio required to be well capitalized 10.00%  
Tier 1 leverage capital ratio required to be well capitalized 5.00%  
Tier 1 capital ratio required for capital adequacy purposes 4.00%  
Total capital ratio required for capital adequacy purposes 8.00%  
Tier 1 leverage capital ratio required for capital adequacy purposes 4.00%  
Regulatory and Agency Capital Requirements (Textual) [Abstract]    
Trust preferred and perpetual preferred purchase securities included in Tier 1 capital $ 4.8  
Minimum leverage ratio for banking organizations 3.00%  
Trust Preferred Securities [Member]
   
Regulatory and Agency Capital Requirements (Textual) [Abstract]    
Trust preferred securities redeemed 2.7  
Wells Fargo & Company [Member]
   
Regulatory And Agency Capital Requirements [Abstract]    
Tier 1 capital, amounts 126.6 114.0
Total capital, amounts 157.6 148.5
Risk Weighted Assets 1,077.1 1,005.6
Adjusted Average Assets 1,336.4 1,262.6
Tier 1 capital ratio 11.75% 11.33%
Total capital ratio 14.63% 14.76%
Tier 1 leverage capital ratio 9.47% 9.03%
Wells Fargo Bank, NA [Member]
   
Regulatory And Agency Capital Requirements [Abstract]    
Tier 1 capital, amounts 101.3 92.6
Total capital, amounts 124.8 117.9
Risk Weighted Assets 1,002.0 923.2
Adjusted Average Assets $ 1,195.9 $ 1,115.4
Tier 1 capital ratio 10.11% 10.03%
Total capital ratio 12.45% 12.77%
Tier 1 leverage capital ratio 8.47% 8.30%