Commitments and Contingencies - Off-Balance Sheet Financial Instruments (Details) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
CRE
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Notional amount	$ 9,642	$ 9,661
Other consumer
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Notional amount	1,538	1,032
Residential mortgage
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Notional amount	158	173
Commitments to extend, originate, or purchase credit and other commitments
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Notional amount	206,600	207,285
Letters of credit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Notional amount	$ 6,843	$ 6,239