Derivative and Hedging Activities - Narrative (Details) - USD ($)	6 Months Ended
	Jun. 30, 2024	Dec. 31, 2023
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized gains on derivatives	$ 88,000,000	$ 10,000,000
Interest , loans and leases held-for-sale	8,000,000
Derivative, amount of hedged item	5,900,000,000
Fair value of interest rate fair value hedging instruments	31,000,000
Amount of gain (loss), net of tax, to be reclassified during the next 12 months	22,000,000
Interest rate swaps on FHLB advances | Derivatives designated hedging instruments: | Cash flow hedging
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, notional amount	$ 0	$ 5,500,000,000