Commitments and Contingencies - Off-Balance Sheet Financial Instruments (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Residential mortgage
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Notional amount	$ 200	$ 200
CRE
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Notional amount	9,829	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	215,998	216,838
Letters of credit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Notional amount	$ 6,158	$ 6,030