Parent Company Financial Statements - Schedule of Condensed Statements of Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Expenses
Interest expense	$ 467	$ 61	$ 96
Other expenses	237	94	117
Income tax expense	264	154	126
Net income	1,098	547	492
Preferred stock dividends	50	18	14
Net income available to common stockholders, basic	1,048	529	478
Net income available to common shareholders, diluted	1,048	529	478
Parent
Income
Dividends from banking subsidiary	1,410	173	230
Other (loss) income	(2)	36	33
Total income	1,408	209	263
Expenses
Interest expense	19	17	17
Other expenses	26	11	12
Total expenses	45	28	29
Income before income taxes and equity in undistributed net income of subsidiaries	1,363	181	234
Income tax expense	44	2	1
Income before equity in undistributed net income of subsidiaries	1,319	179	233
Equity in (distributed) undistributed net income of subsidiaries	(221)	368	259
Net income	1,098	547	492
Preferred stock dividends	50	18	14
Net income available to common stockholders, basic	$ 1,048	$ 529	$ 478