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Regulatory Requirements - U.S. Bank Subsidiaries' Regulatory Capital and Capital Ratios (Details)
$ in Millions
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Required Ratio    
Common Equity Tier 1 capital (as a percent) 13.20% 13.20%
Tier 1 capital (as a percent) 0.147 0.147
Total capital (as a percent) 0.167 0.167
Tier 1 leverage (as a percent) 0.040  
SLR (as a percent) 5.00%  
Amount    
Common Equity Tier 1 capital $ 75,742 $ 78,650
Tier 1 capital 83,348 88,079
Total capital $ 93,166 $ 97,213
Ratio    
Common Equity Tier 1 capital (as a percent) 0.160 0.174
Tier 1 capital (as a percent) 0.177 0.194
Total capital (as a percent) 0.197 0.215
Tier 1 leverage (as a percent) 0.071 0.084
SLR (as a percent) 0.056 0.074
MSBNA    
Required Ratio    
Common Equity Tier 1 capital (as a percent) 6.50%  
Tier 1 capital (as a percent) 8.00%  
Total capital (as a percent) 0.100  
Tier 1 leverage (as a percent) 0.050  
SLR (as a percent) 6.00%  
Required Ratio    
Common Equity Tier 1 capital (as a percent) 7.00%  
Tier 1 capital (as a percent) 0.085  
Total capital (as a percent) 0.105  
Tier 1 leverage (as a percent) 0.040  
SLR (as a percent) 3.00%  
Amount    
Common Equity Tier 1 capital $ 18,960 $ 17,238
Tier 1 capital 18,960 17,238
Total capital 19,544 17,882
Tier 1 leverage 185,120 17,238
SLR $ 233,358 $ 17,238
Ratio    
Common Equity Tier 1 capital (as a percent) 0.205 0.187
Tier 1 capital (as a percent) 0.205 0.187
Total capital (as a percent) 0.211 0.194
Tier 1 leverage (as a percent) 0.102 0.101
SLR (as a percent) 0.081 0.080
MSPBNA    
Required Ratio    
Common Equity Tier 1 capital (as a percent) 6.50%  
Tier 1 capital (as a percent) 8.00%  
Total capital (as a percent) 0.100  
Tier 1 leverage (as a percent) 0.050  
SLR (as a percent) 6.00%  
Required Ratio    
Common Equity Tier 1 capital (as a percent) 7.00%  
Tier 1 capital (as a percent) 0.085  
Total capital (as a percent) 0.105  
Tier 1 leverage (as a percent) 0.040  
SLR (as a percent) 3.00%  
Amount    
Common Equity Tier 1 capital $ 10,293 $ 8,213
Tier 1 capital 10,293 8,213
Total capital 10,368 8,287
Tier 1 leverage 149,375 8,213
SLR $ 153,810 $ 8,213
Ratio    
Common Equity Tier 1 capital (as a percent) 0.243 0.213
Tier 1 capital (as a percent) 0.243 0.213
Total capital (as a percent) 0.245 0.215
Tier 1 leverage (as a percent) 0.069 0.072
SLR (as a percent) 0.067 0.069