Borrowings - Detailed Information on FHLB Advances and Other Borrowings (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Debt Disclosure [Abstract]
Maximum outstanding at any month end	$ 4,700	$ 5,595	$ 4,700	$ 5,595
Average outstanding balance	3,694	4,080	2,579	3,894
Average remaining borrowing capacity	$ 1,993	$ 5,705	$ 3,222	$ 5,495
Weighted average interest rate	1.96%	0.42%	1.42%	0.43%