Stock-Based Compensation - Other Stock-Based Compensation (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions			12 Months Ended
	Apr. 21, 2009	Mar. 28, 2007	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Employee Stock Ownership Plan (ESOP) Disclosures
Stock-based compensation expense			$ 120	$ 123	$ 132
1993 Stock Purchase Plan
Employee Stock Ownership Plan (ESOP) Disclosures
Available for future issuance (in shares)			3,300
Additional share issued	12,000	1,500
Performance shares
Employee Stock Ownership Plan (ESOP) Disclosures
Award performance period			3 years
Shares granted			251	280	328
Weighted-average grant-date fair value per share (in dollars per share)			$ 33.53	$ 29.64	$ 26.72
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
Employee stock purchase plan
Employee Stock Ownership Plan (ESOP) Disclosures
Match on qualifying employees purchase of shares of the Bancorp's common stock (as a percent)			15.00%
Stock purchased by plan participants (in shares)			470	884	564
Stock-based compensation expense			$ 2	$ 2	$ 2