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Capital - Actual Capital Amount and Ratios (Details)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Mar. 17, 2017
Total      
Excess, ratio 0.0377    
Leverage Capital      
Banking Regulation, Capital Conservation Buffer, Capital Conserved, Minimum 0.0127    
Fixed-to-Floating Rate Series A Noncumulative Perpetual Preferred Stock      
Leverage Capital      
Interest in preferred stock     2.50%
Parent company      
Common Equity Tier 1      
Total capital, amount $ 8,009,000,000 $ 6,335,000,000  
Total capital, ratio 0.0905 0.0906  
Minimum for capital adequacy, amount $ 3,983,000,000 $ 3,146,000,000  
Minimum for capital adequacy, ratio 0.0450 0.0450  
Excess, amount $ 4,026,000,000 $ 3,189,000,000  
Excess, ratio 4.55% 4.56%  
Tier 1      
Total capital, amount $ 8,512,000,000 $ 6,838,000,000  
Total capital, ratio 0.0962 0.0978  
Minimum for capital adequacy, amount $ 5,310,000,000 $ 4,195,000,000  
Minimum for capital adequacy, ratio 0.0600 0.0600  
Excess, amount $ 3,202,000,000 $ 2,643,000,000  
Excess, ratio 0.0362 0.0378  
Total      
Total capital, amount $ 10,415,000,000 $ 8,154,000,000  
Total capital, ratio 0.1177 0.1166  
Minimum for capital adequacy, amount $ 7,081,000,000 $ 5,593,000,000  
Minimum for capital adequacy, ratio 0.0800 0.0800  
Excess, amount $ 3,334,000,000 $ 2,561,000,000  
Excess, ratio 0.0377 0.0366  
Leverage Capital      
Total capital, amount $ 8,512,000,000 $ 6,838,000,000  
Total capital, ratio 0.0775 0.0970  
Minimum for capital adequacy, amount $ 4,392,000,000 $ 2,819,000,000  
Minimum for capital adequacy, ratio 0.0400 0.0400  
Excess, amount $ 4,120,000,000 $ 4,019,000,000  
Excess, ratio 3.75% 5.70%  
Subsidiaries      
Common Equity Tier 1      
Total capital, amount $ 9,305,000,000 $ 7,653,000,000  
Total capital, ratio 0.1052 0.1096  
Minimum for capital adequacy, amount $ 3,980,000,000 $ 3,142,000,000  
Minimum for capital adequacy, ratio 0.0450 0.0450  
Excess, amount $ 5,325,000,000 $ 4,511,000,000  
Excess, ratio 6.02% 6.46%  
Tier 1      
Total capital, amount $ 9,305,000,000 $ 7,653,000,000  
Total capital, ratio 0.1052 0.1096  
Minimum for capital adequacy, amount $ 5,307,000,000 $ 4,189,000,000  
Minimum for capital adequacy, ratio 0.0600 0.0600  
Excess, amount $ 3,998,000,000 $ 3,464,000,000  
Excess, ratio 0.0452 0.0496  
Total      
Total capital, amount $ 10,271,000,000 $ 7,982,000,000  
Total capital, ratio 0.1161 0.1143  
Minimum for capital adequacy, amount $ 7,076,000,000 $ 5,585,000,000  
Minimum for capital adequacy, ratio 0.0800 0.0800  
Excess, amount $ 3,195,000,000 $ 2,397,000,000  
Excess, ratio 0.0361 0.0343  
Leverage Capital      
Total capital, amount $ 9,305,000,000 $ 7,653,000,000  
Total capital, ratio 0.0848 0.1087  
Minimum for capital adequacy, amount $ 4,389,000,000 $ 2,817,000,000  
Minimum for capital adequacy, ratio 0.0400 0.0400  
Excess, amount $ 4,916,000,000 $ 4,836,000,000  
Excess, ratio 4.48% 6.87%