Retirement and Benefit Plans - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plan Disclosure
Increase in pension expense by lowering both the expected rate of return on the plan and the discount rate by 0.25%	$ 1,000,000
Estimated future defined benefit plan contributions	2,000,000
Estimated pension benefit payments for 2023	14,000,000
Estimated pension benefit payments for 2024	13,000,000
Estimated pension benefit payments for 2025	13,000,000
Estimated pension benefit payments for 2026	12,000,000
Estimated pension benefit payments for 2027	12,000,000
Estimated pension benefit payments for 2028 through 2032	47,000,000
Trustee fees	0	$ 0	$ 0
Qualified defined contribution plan
Defined Benefit Plan Disclosure
Expenses recognized for the Bancorp's defined contribution plan	111,000,000	108,000,000	105,000,000
Non-qualified defined contribution plan
Defined Benefit Plan Disclosure
Expenses recognized for the Bancorp's defined contribution plan	7,000,000	5,000,000	5,000,000
Deferred profit sharing
Defined Benefit Plan Disclosure
Expenses recognized for the Bancorp's defined contribution plan	$ 0	$ 0	$ 0