Commitments and Contingencies - Off-Balance Sheet Financial Instruments (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Residential mortgage
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Notional amount	$ 184	$ 200
CRE
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Notional amount	9,698	9,955
Other consumer
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Notional amount	759	723
Commitments to extend, originate, or purchase credit and other commitments
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Notional amount	215,275	216,838
Letters of credit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Notional amount	$ 5,893	$ 6,030