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Regulatory and Agency Capital Requirements (Details) (USD $)
In Billions, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Regulatory And Agency Capital Requirements [Abstract]    
Tier 1 capital ratio required to be well capitalized 6.00% 6.00%
Total capital ratio required to be well capitalized 10.00% 10.00%
Tier 1 leverage capital ratio required to be well capitalized 5.00% 5.00%
Tier 1 capital ratio required for capital adequacy purposes 4.00% 4.00%
Total capital ratio required for capital adequacy purposes 8.00% 8.00%
Tier 1 leverage capital ratio required for capital adequacy purposes 4.00% 4.00%
Regulatory and Agency Capital Requirements (Textual) [Abstract]    
Trust preferred and perpetual preferred purchase securities included in Tier 1 capital $ 2.1  
Minimum leverage ratio for banking organizations 3.00%  
Trust Preferred Securities [Member]
   
Regulatory and Agency Capital Requirements (Textual) [Abstract]    
Trust preferred securities redeemed 2.8  
Wells Fargo & Company [Member]
   
Regulatory And Agency Capital Requirements [Abstract]    
Tier 1 capital, amounts 129.1 126.6
Total capital, amounts 161.6 157.6
Risk Weighted Assets 1,094.3 1,077.1
Adjusted Average Assets 1,354.5 1,336.4
Tier 1 capital ratio 11.80% 11.75%
Total capital ratio 14.76% 14.63%
Tier 1 leverage capital ratio 9.53% 9.47%
Wells Fargo Bank, NA [Member]
   
Regulatory And Agency Capital Requirements [Abstract]    
Tier 1 capital, amounts 105.5 101.3
Total capital, amounts 130.5 124.8
Risk Weighted Assets 1,001.5 1,002.0
Adjusted Average Assets $ 1,211.3 $ 1,195.9
Tier 1 capital ratio 10.54% 10.11%
Total capital ratio 13.03% 12.45%
Tier 1 leverage capital ratio 8.71% 8.47%