Stock-Based Compensation (Stock-Based Compensation - Additional Information) (Detail) $ / shares in Units, $ in Millions			12 Months Ended
	Apr. 21, 2009 shares	Mar. 28, 2007 shares	Dec. 31, 2019 USD ($) $ / shares shares	Dec. 31, 2018 USD ($) $ / shares shares	Dec. 31, 2017 USD ($) $ / shares shares
Employee Stock Ownership Plan (ESOP) Disclosures
The Bancorp's total overhang (potential dilution from share-based compensation)			10.00%
SARs, RSAs, RSUs, stock options and PSAs outstanding as a percentage of issued shares			5.00%
Annual return on tangible common equity performance hurdle			2.00%
Stock-based compensation expense			$ 132	$ 127	$ 118
Income tax benefit related to stock-based compensation expense			27	$ 27	$ 41
Aggregate intrinsic value of exercisable options			$ 13
Share available for future issuance | shares			39,500,000
Minimum Volatility rate			23.00%
Maximum volatility rate			(29.00%)
Minimum Risk Free rate			2.34%
Maximum Risk Free Rate			(2.51%)
Departure Rate			10.00%
Share Based Compensation Arrangement By Share Based payment Award FairValue Assumtions Exercise Ratios Minimum			2.20%
Share Based Compensation Arrangement By Share Based payment Award FairValue Assumtions Exercise Ratios Maximum			2.80%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term			7 years	7 years	6 years
Aggregate intrinsic value of outstanding options			$ 15
1993 Stock Purchase Plan
Employee Stock Ownership Plan (ESOP) Disclosures
Available for future issuance | shares			4,600,000
Additional share issued | shares	12,000,000	1,500,000
Minimum
Employee Stock Ownership Plan (ESOP) Disclosures
Performanace based stock award granted | shares			0
Maximum
Employee Stock Ownership Plan (ESOP) Disclosures
Performanace based stock award granted | shares			1,000,000
Stock Appreciation Rights Granted
Employee Stock Ownership Plan (ESOP) Disclosures
Vesting period of share based compensation			ratably over a three or four-year period of continued employment.
Stock-based compensation expense			$ 7
Weighted-average grant-date fair value per share | $ / shares			$ 7.38	$ 11.33	$ 8.55
Total grant-date fair value			$ 20	$ 26	$ 29
Weighted-average period over which expense is expected to be recognized			1 year 1 month 6 days
Shares granted | shares			399,000	272,000	3,672,000
Restricted Stock Awards
Employee Stock Ownership Plan (ESOP) Disclosures
Vesting period of share based compensation			after three or four years or ratably over three or four years of continued employment.
Total grant-date fair value			$ 16	$ 27	$ 39
Weighted-average period over which expense is expected to be recognized			1 year 2 months 12 days
Shares granted | shares			0	0	7,000
Share based compensation arrangement award replacement of other than option granted outstanding			1.65
Restricted Stock Units
Employee Stock Ownership Plan (ESOP) Disclosures
Vesting period of share based compensation			after three or four years or ratably over three or four years of continued employment.
Stock-based compensation expense			$ 125
Total grant-date fair value			$ 73	$ 42	$ 21
Weighted-average period over which expense is expected to be recognized			2 years 3 months 18 days
Shares granted | shares			4,375,000	3,674,000	3,652,000
Stock options
Employee Stock Ownership Plan (ESOP) Disclosures
Intrinsic value of stock options exercised			$ 7
Cash received from stock options exercised			$ 11
Stock options vested | shares			0	0	0
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term			5 years 4 months 24 days
Tax benefit from exercised stock options			$ 1
Performance Share Awards
Employee Stock Ownership Plan (ESOP) Disclosures
Vesting period of share based compensation			three-year cliff vesting terms
Weighted-average grant-date fair value per share | $ / shares			$ 26.72	$ 33.15	$ 26.52
Shares granted | shares			328,068	279,568	407,069
Employee stock purchase plan
Employee Stock Ownership Plan (ESOP) Disclosures
Stock-based compensation expense			$ 2	$ 2	$ 1
Match on qualifying employees purchase of shares of the Bancorp's common stock			15.00%
Stock purchased by plan participants | shares			564,061	471,818	475,466
2019 Incentive Compensation Plan
Employee Stock Ownership Plan (ESOP) Disclosures
Stock authorized for issuance | shares			40,000,000