v3.25.2
Fair Value Measurements (Narrative) (Details)
shares in Millions, $ in Millions
Jun. 30, 2025
USD ($)
security
Dec. 31, 2024
USD ($)
security
Jun. 30, 2016
shares
Jun. 30, 2015
shares
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available for Sale $ 32,250.4 $ 29,001.5    
Visa Class B        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Shares issued (in shares) | shares     1.1 1.0
LEVEL 2        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Number of available for sale securities portfolio | security 963 940    
Available for Sale $ 24,000.0 $ 21,600.0    
LEVEL 3 | Fair Value, Measurements, Nonrecurring | Measurement Input, Discount Rate        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Loans, measurement input   0.200    
LEVEL 3 | Fair Value, Measurements, Nonrecurring | Measurement Input, Discount Rate | Weighted Average        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Loans, measurement input   0.200