Parent Company Financial Statements - Condensed Statements of Income - Parent Company Only (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Income
Dividends from consolidated nonbank subsidiaries	$ 1,800	$ 1,800
Securities gains (losses), net	15	18	$ (84)
Total interest income	10,426	9,760	6,587
Expenses
Interest	4,796	3,933	978
Other	178	184	145
Applicable income tax expense	602	639	647
Net Income	2,314	2,349	2,446
Other Comprehensive Income	(149)	623	(6,317)
Parent Company
Income
Dividends from consolidated nonbank subsidiaries	1,800	1,819	165
Securities gains (losses), net	3	4	(9)
Interest	85	63	11
Total interest income	1,888	1,886	167
Expenses
Interest	553	525	311
Other	27	39	19
Total expenses	580	564	330
Income (Loss) Before Income Taxes and Equity in Undistributed Earnings of Subsidiaries	1,308	1,322	(163)
Applicable income tax expense	(115)	(112)	(76)
Income (Loss) Before Equity in Undistributed Earnings of Subsidiaries	1,423	1,434	(87)
Equity in undistributed earnings	891	915	2,533
Net Income	2,314	2,349	2,446
Other Comprehensive Income	0	0	0
Comprehensive Income	2,314	2,349	2,446
Dividends from Bancorp's banking subsidiary to the Bancorp's non-bank subsidiary	$ 1,800	$ 1,800	$ 0