Stock-Based Compensation - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions	9 Months Ended	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Apr. 16, 2024	Dec. 31, 2021
Employee Stock Ownership Plan (ESOP) Disclosures
Share available for future issuance (in shares)	54,500,000	54,500,000
The Bancorp's total overhang (potential dilution from share-based compensation) (as a percent)	11.00%	11.00%
SARs, RSAs, RSUs, stock options and PSAs outstanding as a percentage of issued shares	2.00%	2.00%
Annual return on tangible common equity performance hurdle (as a percent)	2.00%	2.00%
Stock-based compensation expense		$ 164	$ 169	$ 165
Income tax benefit related to stock-based compensation expense		$ 34	$ 35	$ 34
Options granted (in shares)		0	0	0
Expected dividend yield		4.20%	3.60%	3.40%
Expected life (in years)		7 years	7 years	7 years
Intrinsic value of stock options exercised		$ 2	$ 1	$ 2
Cash received from stock options exercised		2	$ 1	$ 1
Aggregate intrinsic value of exercisable options	$ 2	$ 2
Shares vested (in shares)		0	0	0
2024 Incentive Compensation Plan
Employee Stock Ownership Plan (ESOP) Disclosures
Stock authorized for issuance (in shares)					55,000,000
SARs
Employee Stock Ownership Plan (ESOP) Disclosures
Award term		10 years
Award vesting period		3 years
Award performance period		3 years
Stock-based compensation expense		$ 2
Weighted-average grant-date fair value per share (in dollars per share)		$ 9.71	$ 10.49	$ 12.76
Total grant-date fair value		$ 3	$ 3	$ 2
Shares granted (in shares)		316,000	253,000	304,000
Number of shares/units outstanding (in shares)	4,636,000	4,636,000	7,331,000	9,112,000		11,185,000
Weighted-average period over which expense is expected to be recognized		1 year 9 months 18 days
Exercisable, weighted- average remaining contractual life (in years)		2 years 8 months 12 days
SARs | Range 4 [Member]
Employee Stock Ownership Plan (ESOP) Disclosures
Number of shares/units outstanding (in shares)	243,000	243,000
Exercisable, weighted- average remaining contractual life (in years)		7 years 1 month 6 days
RSAs and RSUs | Tranche One
Employee Stock Ownership Plan (ESOP) Disclosures
Award vesting period		3 years
Award performance period		3 years
RSAs and RSUs | Tranche Two
Employee Stock Ownership Plan (ESOP) Disclosures
Award vesting period		4 years
Award performance period		4 years
Stock options
Employee Stock Ownership Plan (ESOP) Disclosures
Award term		10 years
Stock options | Tranche One
Employee Stock Ownership Plan (ESOP) Disclosures
Award vesting period		3 years
Stock options | Tranche Two
Employee Stock Ownership Plan (ESOP) Disclosures
Award vesting period		4 years
Performance shares
Employee Stock Ownership Plan (ESOP) Disclosures
Award vesting period		3 years
Award performance period		3 years
Percentage of shares that will be forfeited		33.33%
Weighted-average grant-date fair value per share (in dollars per share)		$ 33.51	$ 37.19	$ 47.03
Shares granted (in shares)		295,000	256,000	288,000
Stock awards distributed (in shares)		355,000	395,000	429,000
Stock award granted, fair value		$ 12	$ 12	$ 11
Performance shares | Minimum
Employee Stock Ownership Plan (ESOP) Disclosures
Stock award granted (in shares)		0
Performance shares | Maximum
Employee Stock Ownership Plan (ESOP) Disclosures
Stock award granted (in shares)		1,200,000
Restricted Stock Units (RSUs)
Employee Stock Ownership Plan (ESOP) Disclosures
Stock-based compensation expense		$ 168
Total grant-date fair value		$ 141	$ 130	$ 110
Shares granted (in shares)		4,546,000	4,763,000	4,682,000
Number of shares/units outstanding (in shares)	10,764,000	10,764,000	10,365,000	9,906,000		9,487,000
Weighted-average period over which expense is expected to be recognized		2 years 3 months 18 days
Employee Stock
Employee Stock Ownership Plan (ESOP) Disclosures
Stock authorized for issuance (in shares)					15,000,000
Stock-based compensation expense		$ 2	$ 2	$ 2
Match on qualifying employees purchase of shares of the Bancorp's common stock (as a percent)	15.00%	15.00%
Stock purchased by plan participants (in shares)	278,000	487,000	768,000	520,000
Shares cancelled (in shares)					1,800,000
Available for future issuance (in shares)	14,700,000	14,700,000