v3.4.0.3
Regulatory Requirements (Significant U.S. Bank Operating Subsidiaries' Capital) (Details) - U.S. Basel III - USD ($)
$ in Millions
Mar. 31, 2016
Dec. 31, 2015
Advanced Approach transitional rules    
Regulatory Requirements    
Common Equity Tier capital, amount $ 58,514 $ 59,409
Tier 1 capital, amount 65,198 66,722
Total capital, amount 77,969 79,403
Tier 1 leverage capital, amount $ 0 $ 0
Ratio    
Common Equity Tier 1 capital, ratio 15.60% 15.50%
Tier 1 capital ratio 17.40% 17.40%
Total capital ratio 20.90% 20.70%
Standardized Approach transitional rules    
Ratio    
Tier 1 leverage ratio 8.20% 8.30%
MSBNA    
Required Capital Ratio    
Common Equity Tier 1 capital ratio, required 6.50% 6.50%
Tier 1 capital ratio, required 8.00% 8.00%
Total capital ratio, required 10.00% 10.00%
Tier 1 leverage ratio, required 5.00% 5.00%
MSBNA | Standardized Approach transitional rules    
Regulatory Requirements    
Common Equity Tier capital, amount $ 13,862 $ 13,333
Tier 1 capital, amount 13,862 13,333
Total capital, amount 15,670 15,097
Tier 1 leverage capital, amount $ 13,862 $ 13,333
Ratio    
Common Equity Tier 1 capital, ratio 15.50% 15.10%
Tier 1 capital ratio 15.50% 15.10%
Total capital ratio 17.50% 17.10%
Tier 1 leverage ratio 10.10% 10.20%
MSPBNA    
Required Capital Ratio    
Common Equity Tier 1 capital ratio, required 6.50% 6.50%
Tier 1 capital ratio, required 8.00% 8.00%
Total capital ratio, required 10.00% 10.00%
Tier 1 leverage ratio, required 5.00% 5.00%
MSPBNA | Standardized Approach transitional rules    
Regulatory Requirements    
Common Equity Tier capital, amount $ 4,660 $ 4,197
Tier 1 capital, amount 4,660 4,197
Total capital, amount 4,692 4,225
Tier 1 leverage capital, amount $ 4,660 $ 4,197
Ratio    
Common Equity Tier 1 capital, ratio 27.00% 26.50%
Tier 1 capital ratio 27.00% 26.50%
Total capital ratio 27.20% 26.70%
Tier 1 leverage ratio 10.90% 10.50%