v3.26.1
DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Schedule of Notional Amounts and Gross Fair Values (Details) - USD ($)
$ in Millions
Mar. 31, 2026
Dec. 31, 2025
Derivatives, Fair Value [Line Items]    
Notional amount $ 15,489.0 $ 15,349.0
Derivative asset, not offset against collateral 60.0 64.0
Derivative liability, not offset against collateral 35.0 51.0
Derivative asset, not subject to master netting arrangement 43.0 58.0
Not subject to master netting arrangement 160.0 157.0
Fair value, asset 103.0 122.0
Fair value, liability 195.0 208.0
Interest rate contracts – designated    
Derivatives, Fair Value [Line Items]    
Derivative asset, not offset against collateral 6.0 13.0
Derivative liability, not offset against collateral 0.0 0.0
Interest rate swaps – not designated    
Derivatives, Fair Value [Line Items]    
Derivative asset, not offset against collateral 54.0 51.0
Derivative liability, not offset against collateral 35.0 51.0
Derivative asset, not subject to master netting arrangement 35.0 51.0
Not subject to master netting arrangement 159.0 155.0
Interest rate lock commitments – not designated    
Derivatives, Fair Value [Line Items]    
Derivative asset, not subject to master netting arrangement 4.0 7.0
Not subject to master netting arrangement 1.0 0.0
Forward delivery commitments – not designated    
Derivatives, Fair Value [Line Items]    
Derivative asset, not subject to master netting arrangement 4.0 0.0
Not subject to master netting arrangement 0.0 2.0
Credit risk contracts – not designated    
Derivatives, Fair Value [Line Items]    
Notional amount 614.0  
Derivative asset, not subject to master netting arrangement 0.0 0.0
Not subject to master netting arrangement 0.0 0.0
Subject to master netting arrangements:    
Derivatives, Fair Value [Line Items]    
Notional amount 7,811.0 7,714.0
Subject to master netting arrangements: | Interest rate contracts – designated    
Derivatives, Fair Value [Line Items]    
Notional amount 1,900.0 1,650.0
Subject to master netting arrangements: | Interest rate swaps – not designated    
Derivatives, Fair Value [Line Items]    
Notional amount 5,911.0 6,064.0
Not subject to master netting arrangements:    
Derivatives, Fair Value [Line Items]    
Notional amount 7,678.0 7,635.0
Not subject to master netting arrangements: | Interest rate swaps – not designated    
Derivatives, Fair Value [Line Items]    
Notional amount 5,911.0 6,064.0
Not subject to master netting arrangements: | Interest rate lock commitments – not designated    
Derivatives, Fair Value [Line Items]    
Notional amount 334.0 298.0
Not subject to master netting arrangements: | Forward delivery commitments – not designated    
Derivatives, Fair Value [Line Items]    
Notional amount 573.0 458.0
Not subject to master netting arrangements: | Credit risk contracts – not designated    
Derivatives, Fair Value [Line Items]    
Notional amount $ 860.0 $ 815.0