v3.25.2
Fair Value Measurements (Fair Value of Financial Instruments) (Details) - USD ($)
Jun. 30, 2025
Dec. 31, 2024
FINANCIAL ASSETS    
Cash and Due from Banks $ 6,423,400,000 $ 4,677,200,000
Federal Reserve and Other Central Bank Deposits 52,266,000,000 38,775,400,000
Interest-Bearing Deposits with Banks 2,412,100,000 1,944,700,000
Federal Funds Sold and Securities Purchased under Agreements to Resell 921,900,000 451,000,000.0
Debt Securities - Held to Maturity 20,141,000,000 20,654,500,000
FINANCIAL LIABILITIES    
Deposits 137,053,700,000 122,482,700,000
Federal Funds Purchased 2,388,500,000 2,159,500,000
Securities Sold Under Agreements to Repurchase 841,400,000 462,000,000.0
Other Borrowings 6,532,900,000 6,521,000,000
Senior Notes 2,835,200,000 2,769,700,000
Unfunded Commitments 0 0
BOOK VALUE    
FINANCIAL ASSETS    
Cash and Due from Banks 6,423,400,000 4,677,200,000
Federal Reserve and Other Central Bank Deposits 52,266,000,000 38,775,400,000
Interest-Bearing Deposits with Banks 2,412,100,000 1,944,700,000
Federal Funds Sold and Securities Purchased under Agreements to Resell 921,900,000 451,000,000.0
Debt Securities - Held to Maturity 21,400,800,000 22,296,700,000
Loans    
Held for Investment 43,139,800,000 43,222,500,000
Held for Sale 3,100,000  
Other Assets 1,484,900,000 1,506,400,000
FINANCIAL LIABILITIES    
Deposits 137,053,700,000 122,482,700,000
Federal Funds Purchased 2,388,500,000 2,159,500,000
Securities Sold Under Agreements to Repurchase 841,400,000 462,000,000.0
Other Borrowings 6,532,900,000 6,521,000,000
Senior Notes 2,835,200,000 2,769,700,000
Long-Term Debt 4,089,800,000 4,081,300,000
Unfunded Commitments 193,200,000 227,100,000
Other Liabilities 52,200,000 50,600,000
TOTAL ESTIMATED FAIR VALUE    
FINANCIAL ASSETS    
Cash and Due from Banks 6,423,400,000 4,677,200,000
Federal Reserve and Other Central Bank Deposits 52,266,000,000 38,775,400,000
Interest-Bearing Deposits with Banks 2,412,100,000 1,944,700,000
Federal Funds Sold and Securities Purchased under Agreements to Resell 921,900,000 451,000,000.0
Debt Securities - Held to Maturity 20,141,000,000 20,654,500,000
Loans    
Held for Investment 42,890,000,000 42,803,200,000
Held for Sale 3,100,000  
Other Assets 1,477,500,000 1,499,200,000
FINANCIAL LIABILITIES    
Deposits 135,592,600,000 122,536,500,000
Federal Funds Purchased 2,388,500,000 2,159,500,000
Securities Sold Under Agreements to Repurchase 841,400,000 462,000,000.0
Other Borrowings 6,556,000,000 6,545,300,000
Senior Notes 2,872,600,000 2,800,300,000
Long-Term Debt 4,183,000,000 4,164,400,000
Unfunded Commitments 193,200,000 227,100,000
Other Liabilities 52,200,000 50,600,000
TOTAL ESTIMATED FAIR VALUE | LEVEL 1    
FINANCIAL ASSETS    
Cash and Due from Banks 6,423,400,000 4,677,200,000
Federal Reserve and Other Central Bank Deposits 0
Interest-Bearing Deposits with Banks 0
Federal Funds Sold and Securities Purchased under Agreements to Resell 0
Debt Securities - Held to Maturity 0
Loans    
Held for Investment 0
Held for Sale 0  
Other Assets 92,200,000 83,300,000
FINANCIAL LIABILITIES    
Deposits 0 0
Federal Funds Purchased 0 0
Securities Sold Under Agreements to Repurchase 0 0
Other Borrowings 0 0
Senior Notes 0 0
Long-Term Debt 0 0
Unfunded Commitments 0 0
Other Liabilities 0 0
TOTAL ESTIMATED FAIR VALUE | LEVEL 2    
FINANCIAL ASSETS    
Cash and Due from Banks 0 0
Federal Reserve and Other Central Bank Deposits 52,266,000,000 38,775,400,000
Interest-Bearing Deposits with Banks 2,412,100,000 1,944,700,000
Federal Funds Sold and Securities Purchased under Agreements to Resell 921,900,000 451,000,000.0
Debt Securities - Held to Maturity 20,141,000,000 20,654,500,000
Loans    
Held for Investment 0 0
Held for Sale 3,100,000  
Other Assets 1,385,300,000 1,415,900,000
FINANCIAL LIABILITIES    
Deposits 135,592,600,000 122,536,500,000
Federal Funds Purchased 2,388,500,000 2,159,500,000
Securities Sold Under Agreements to Repurchase 841,400,000 462,000,000.0
Other Borrowings 6,556,000,000 6,545,300,000
Senior Notes 2,872,600,000 2,800,300,000
Long-Term Debt 4,183,000,000 4,164,400,000
Unfunded Commitments 193,200,000 227,100,000
Other Liabilities 0 0
TOTAL ESTIMATED FAIR VALUE | LEVEL 3    
FINANCIAL ASSETS    
Cash and Due from Banks 0 0
Federal Reserve and Other Central Bank Deposits 0 0
Interest-Bearing Deposits with Banks 0 0
Federal Funds Sold and Securities Purchased under Agreements to Resell 0 0
Debt Securities - Held to Maturity 0 0
Loans    
Held for Investment 42,890,000,000 42,803,200,000
Held for Sale 0  
Other Assets 0 0
FINANCIAL LIABILITIES    
Deposits 0 0
Federal Funds Purchased 0 0
Securities Sold Under Agreements to Repurchase 0 0
Other Borrowings 0 0
Senior Notes 0 0
Long-Term Debt 0 0
Unfunded Commitments 0 0
Other Liabilities $ 52,200,000 $ 50,600,000