Commitments and Contingencies - Off-Balance Sheet Financial Instruments (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Residential mortgage
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Notional amount	$ 205	$ 244
CRE
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Notional amount	9,832	10,243
Indirect other
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Notional amount	667	588
Commitments to extend, originate, or purchase credit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Notional amount	214,549	198,658
Letters of credit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Notional amount	$ 6,027	$ 5,568