Noninterest Income - Wealth Management and Trust Fees (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Other Income and Expenses [Abstract]
Wealth management fees	$ 20	$ 0	$ 40	$ 0
Trust fees	2	0	4	0
Wealth management and trust fees	$ 22	$ 0	$ 44	$ 0