Parent Company - Condensed Balance Sheets (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Assets
Other assets	$ 21,179	$ 19,114
Total assets	271,461	261,108	$ 228,354
Liabilities and Shareholders’ Equity
Long-term debt	49,715	47,866
Total liabilities	241,197	233,051
Shareholders’ Equity
Total shareholders’ equity	30,264	28,057	$ 24,711	$ 22,177
Total liabilities and shareholders’ equity	271,461	261,108
Parent Company
Assets
Cash and cash equivalents	7,293	9,652
Equity in net assets of subsidiaries and affiliates	30,165	28,019
Loans to subsidiaries and affiliates	28,897	25,471
Due from subsidiaries and affiliates	1,291	1,261
Other assets	573	349
Total assets	68,219	64,752
Liabilities and Shareholders’ Equity
Accounts payable and other liabilities	2,239	2,188
Due to subsidiaries and affiliates	404	555
Long-term debt	35,312	33,952
Total liabilities	37,955	36,695
Shareholders’ Equity
Total shareholders’ equity	30,264	28,057
Total liabilities and shareholders’ equity	$ 68,219	$ 64,752