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Regulatory and Capital Adequacy - Capital Ratios Under Basel III (Details)
$ in Millions
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Common equity Tier 1 capital:    
Capital Amount $ 50,807 $ 47,615
Capital Ratio 0.135 0.129
Minimum Capital Adequacy 0.045 0.045
Tier 1 capital    
Capital Amount $ 55,652 $ 52,460
Capital Ratio 0.148 0.142
Minimum Capital Adequacy 0.060 0.060
Well- Capitalized 0.060 0.060
Total capital    
Capital Amount $ 61,805 $ 59,124
Capital Ratio 0.164 0.160
Minimum Capital Adequacy 0.080 0.080
Well- Capitalized 0.100 0.100
Tier 1 leverage    
Capital Amount $ 55,652 $ 52,460
Capital Ratio 0.116 0.112
Minimum Capital Adequacy 0.040 0.040
Supplementary leverage    
Capital Amount $ 55,652 $ 52,460
Capital Ratio 0.099 0.096
Minimum Capital Adequacy 0.030 0.030
CONA:    
Common equity Tier 1 capital:    
Capital Amount $ 51,118 $ 47,933
Capital Ratio 0.136 0.131
Minimum Capital Adequacy 0.045 0.045
Well- Capitalized 0.065 0.065
Tier 1 capital    
Capital Amount $ 51,118 $ 47,933
Capital Ratio 0.136 0.131
Minimum Capital Adequacy 0.060 0.060
Well- Capitalized 0.080 0.080
Total capital    
Capital Amount $ 56,937 $ 52,636
Capital Ratio 0.152 0.143
Minimum Capital Adequacy 0.080 0.080
Well- Capitalized 0.100 0.100
Tier 1 leverage    
Capital Amount $ 51,118 $ 47,933
Capital Ratio 0.107 0.103
Minimum Capital Adequacy 0.040 0.040
Well- Capitalized 0.050 0.050
Supplementary leverage    
Capital Amount $ 51,118 $ 47,933
Capital Ratio 0.092 0.088
Minimum Capital Adequacy 0.030 0.030