Parent Company Financial Statements - Condensed Statements of Income - Parent Company Only (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income
Dividends from consolidated nonbank subsidiaries	$ 3,000	$ 1,300
Securities (losses) gains, net	(7)	62	$ 40
Total interest income	5,211	5,572	6,254
Expenses
Interest	441	790	1,457
Other	218	221	232
Applicable income tax expense	747	370	690
Net Income	2,770	1,427	2,512
Other Comprehensive Income	(1,394)	1,409	1,304
Parent Company
Income
Dividends from consolidated nonbank subsidiaries	3,040	1,285	2,155
Securities (losses) gains, net	1	1	2
Interest	11	17	24
Total interest income	3,052	1,303	2,181
Expenses
Interest	250	266	267
Other	30	26	65
Total expenses	280	292	332
Income Before Income Taxes and Equity in Undistributed Earnings of Subsidiaries	2,772	1,011	1,849
Applicable income tax expense	(62)	(65)	(69)
Income Before Equity in Undistributed Earnings of Subsidiaries	2,834	1,076	1,918
Equity in undistributed earnings	(64)	351	594
Net Income	2,770	1,427	2,512
Other Comprehensive Income	0	0	0
Comprehensive income attributable to Bancorp	$ 2,770	$ 1,427	$ 2,512