Parent Company-Only Financial Information - Balance Sheet (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
ASSETS:
Cash and cash equivalents	$ 15,430	$ 11,475
Other assets	2,517	3,254
Total assets	100,160	114,057
LIABILITIES AND STOCKHOLDERS' EQUITY:
Subordinated notes	444	438
Other liabilities	1,696	2,897
Total liabilities	91,992	105,690
Stockholders’ equity	8,167	8,367	$ 8,824	$ 7,044
Total liabilities and stockholders’ equity	100,160	114,057
Parent company
ASSETS:
Cash and cash equivalents	579	158
Investments in subsidiaries	8,580	9,160
Other assets	49	80
Total assets	9,208	9,398
LIABILITIES AND STOCKHOLDERS' EQUITY:
Junior subordinated debentures	582	579
Subordinated notes	443	438
Other liabilities	14	14
Total liabilities	1,039	1,031
Stockholders’ equity	8,169	8,367
Total liabilities and stockholders’ equity	$ 9,208	$ 9,398