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Regulatory and Capital Adequacy - Capital Ratios Under Basel III (Details)
$ in Millions
Dec. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Common equity Tier 1 capital:    
Capital Amount $ 73,048 $ 50,807
Capital Ratio 0.143 0.135
Minimum Capital Adequacy 0.045 0.045
Tier 1 capital    
Capital Amount $ 78,454 $ 55,652
Capital Ratio 0.153 0.148
Minimum Capital Adequacy 0.060 0.060
Well- Capitalized 0.060 0.060
Total capital    
Capital Amount $ 88,000 $ 61,805
Capital Ratio 0.172 0.164
Minimum Capital Adequacy 0.080 0.080
Well- Capitalized 0.100 0.100
Tier 1 leverage    
Capital Amount $ 78,454 $ 55,652
Capital Ratio 0.125 0.116
Minimum Capital Adequacy 0.040 0.040
Supplementary leverage    
Capital Amount $ 78,454 $ 55,652
Capital Ratio 0.106 0.099
Minimum Capital Adequacy 0.030 0.030
CONA:    
Common equity Tier 1 capital:    
Capital Amount $ 68,204 $ 51,118
Capital Ratio 0.134 0.136
Minimum Capital Adequacy 0.045 0.045
Well- Capitalized 0.065 0.065
Tier 1 capital    
Capital Amount $ 68,204 $ 51,118
Capital Ratio 0.134 0.136
Minimum Capital Adequacy 0.060 0.060
Well- Capitalized 0.080 0.080
Total capital    
Capital Amount $ 76,711 $ 56,937
Capital Ratio 0.151 0.152
Minimum Capital Adequacy 0.080 0.080
Well- Capitalized 0.100 0.100
Tier 1 leverage    
Capital Amount $ 68,204 $ 51,118
Capital Ratio 0.109 0.107
Minimum Capital Adequacy 0.040 0.040
Well- Capitalized 0.050 0.050
Supplementary leverage    
Capital Amount $ 68,204 $ 51,118
Capital Ratio 0.093 0.092
Minimum Capital Adequacy 0.030 0.030