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Derivative and Hedging Activities - Narrative (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Derivative Instruments, Gain (Loss) [Line Items]    
Net unrealized gain on cash flow hedges, net of tax of $(6) and $(20), respectively $ 10 $ 52
Interest , loans and leases held-for-sale 24 6
Amount of hedged item 6,100  
Fair value of interest rate fair value hedging instruments 9  
Amount of gain (loss), net of tax, to be reclassified during the next 12 months 98  
Interest rate swaps    
Derivative Instruments, Gain (Loss) [Line Items]    
Notional amount 2,000  
Amount of hedged item 2,000  
Interest rate swaps | Derivatives designated as cash flow hedging instruments: | Cash flow hedging    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative, notional amount $ 5,500 $ 3,800